Relativistic MR-MP Energy Levels for L-shell Ions of Sulfur and Argon

Santana, Juan A.; Lopez-Dauphin, Nahyr A.; Morales Butler, Emmanuel J.; Beiersdorfer, Peter

doi:10.3847/1538-4365/aae14e

Title: Relativistic MR-MP Energy Levels for L-shell Ions of Sulfur and Argon

Abstract

Calculated level energies for valence and K-vacancy states are given for the ion series S vii–S xiv and Ar ix–Ar xvi. The calculations were performed with the relativistic Multi-Reference Møller–Plesset Perturbation Theory method (MR-MP). The data set includes all the level energies with configurations $$1{s}^{2}2{(s,p)}^{q}$$, $$1{s}^{2}2{(s,p)}^{q-1}{nl}$$, $$1{s}^{1}2{(s,p)}^{q+1}$$, $$1{s}^{1}2{(s,p)}^{q}{nl}$$, $$2{(s,p)}^{q+2}$$, and $$2{(s,p)}^{q+1}{nl}$$, where 1 ≤ q ≤ 8, n ≤ 5, and l ≤ 3. We have compared our results with data from the National Institute of Standards and Technology (NIST) online database and with previous calculations. The average deviation of valence level energies ranges from 0.16 eV in Ne-like ions to 0.01 eV in Li-like ions, demonstrating that the present MR-MP valence level energies are highly accurate. In the case of K-vacancy states, the deviation is generally below 0.3 eV for Li-like S xiv and Ar xvi. The deviation for K-vacancy energies in other L-shell ions (Be-, B-, C-, N-, and O-like Ar ions) is higher but likely because the NIST-recommended values have a higher uncertainty. The data set includes many n = 4 and n = 5 valence and K-vacancy levels in L-shell ions of S and Ar that have not been previously reported. The data can be used for line identification and modeling of L-shell ions of S and Ar in astrophysical and laboratory-generated plasmas, and as energy references in the absence of more accurate laboratory calculations.

Authors:

^[1]; Lopez-Dauphin, Nahyr A. ^[2]; Morales Butler, Emmanuel J. ^[3];

^[4]

Univ. of Puerto Rico, Cayey, PR (United States)
Univ. of Puerto Rico, Cayey, PR (United States); Univ. at Buffalo, NY (United States)
Univ. of Puerto Rico, Utuado, PR (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Publication Date:: Tue Oct 23 00:00:00 EDT 2018

Research Org.:: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Org.:: USDOE Office of Science (SC); USDOE National Nuclear Security Administration (NNSA)

OSTI Identifier:: 1545291

Grant/Contract Number:: AC52-07NA27344

Resource Type:: Accepted Manuscript

Journal Name:: The Astrophysical Journal. Supplement Series (Online)

Additional Journal Information:: Journal Name: The Astrophysical Journal. Supplement Series (Online); Journal Volume: 238; Journal Issue: 2; Journal ID: ISSN 1538-4365

Publisher:: American Astronomical Society/IOP

Country of Publication:: United States

Language:: English

Subject:: 79 ASTRONOMY AND ASTROPHYSICS; atomic data; line: identification

Citation Formats


                    Santana, Juan A., Lopez-Dauphin, Nahyr A., Morales Butler, Emmanuel J., and Beiersdorfer, Peter. Relativistic MR-MP Energy Levels for L-shell Ions of Sulfur and Argon.  United States: N. p., 2018. 
Web.  doi:10.3847/1538-4365/aae14e.

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                    Santana, Juan A., Lopez-Dauphin, Nahyr A., Morales Butler, Emmanuel J., & Beiersdorfer, Peter. Relativistic MR-MP Energy Levels for L-shell Ions of Sulfur and Argon.  United States.  https://doi.org/10.3847/1538-4365/aae14e

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                    Santana, Juan A., Lopez-Dauphin, Nahyr A., Morales Butler, Emmanuel J., and Beiersdorfer, Peter. Tue .  
"Relativistic MR-MP Energy Levels for L-shell Ions of Sulfur and Argon".  United States.  https://doi.org/10.3847/1538-4365/aae14e.  https://www.osti.gov/servlets/purl/1545291.

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@article{osti_1545291,

  title        = {Relativistic MR-MP Energy Levels for L-shell Ions of Sulfur and Argon},

  author       = {Santana, Juan A. and Lopez-Dauphin, Nahyr A. and Morales Butler, Emmanuel J. and Beiersdorfer, Peter},

  abstractNote = {Calculated level energies for valence and K-vacancy states are given for the ion series S vii–S xiv and Ar ix–Ar xvi. The calculations were performed with the relativistic Multi-Reference Møller–Plesset Perturbation Theory method (MR-MP). The data set includes all the level energies with configurations $1{s}^{2}2{(s,p)}^{q}$, $1{s}^{2}2{(s,p)}^{q-1}{nl}$, $1{s}^{1}2{(s,p)}^{q+1}$, $1{s}^{1}2{(s,p)}^{q}{nl}$, $2{(s,p)}^{q+2}$, and $2{(s,p)}^{q+1}{nl}$, where 1 ≤ q ≤ 8, n ≤ 5, and l ≤ 3. We have compared our results with data from the National Institute of Standards and Technology (NIST) online database and with previous calculations. The average deviation of valence level energies ranges from 0.16 eV in Ne-like ions to 0.01 eV in Li-like ions, demonstrating that the present MR-MP valence level energies are highly accurate. In the case of K-vacancy states, the deviation is generally below 0.3 eV for Li-like S xiv and Ar xvi. The deviation for K-vacancy energies in other L-shell ions (Be-, B-, C-, N-, and O-like Ar ions) is higher but likely because the NIST-recommended values have a higher uncertainty. The data set includes many n = 4 and n = 5 valence and K-vacancy levels in L-shell ions of S and Ar that have not been previously reported. The data can be used for line identification and modeling of L-shell ions of S and Ar in astrophysical and laboratory-generated plasmas, and as energy references in the absence of more accurate laboratory calculations.},

  doi          = {10.3847/1538-4365/aae14e},

  journal      = {The Astrophysical Journal. Supplement Series (Online)},

  number       = 2,

  volume       = 238,

  place        = {United States},

  year         = {Tue Oct 23 00:00:00 EDT 2018},

  month        = {Tue Oct 23 00:00:00 EDT 2018}

}

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Figures / Tables:

Table 1: Valence Level Energies in L-shell Ions of S Evaluated with the MR-MP Method

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journal, March 2018

Wang, HongBin; Jiang, Gang; Li, XiangFu
Atomic Data and Nuclear Data Tables, Vol. 120
DOI: 10.1016/j.adt.2017.03.001

Production and decay of sulfur excited species in an electron-cyclotron-resonance ion-source plasma
journal, September 2009

Martins, M. C.; Marques, J. P.; Costa, A. M.
Physical Review A, Vol. 80, Issue 3
DOI: 10.1103/PhysRevA.80.032501

High-resolution X-ray spectroscopy of Procyon by Chandra and XMM-Newton
journal, June 2002

Raassen, A. J. J.; Mewe, R.; Audard, M.
Astronomy & Astrophysics, Vol. 389, Issue 1
DOI: 10.1051/0004-6361:20020529

Calculations with spectroscopic accuracy: energies, transition rates, and Landé g _J -factors in the carbon isoelectronic sequence from Ar XIII to Zn XXV
journal, March 2014

Ekman, J.; Jönsson, P.; Gustafsson, S.
Astronomy & Astrophysics, Vol. 564
DOI: 10.1051/0004-6361/201323163

CHIANTI – an atomic database for emission lines: III. Continuum radiation and extension of the ion database
journal, March 1999

Landi, E.; Landini, M.; Dere, K. P.
Astronomy and Astrophysics Supplement Series, Vol. 135, Issue 2
DOI: 10.1051/aas:1999449

Dramatic Variability of X-ray Absorption Lines in the Black Hole Candidate Cygnus X-1
text, January 2007

Chang, Chulhoon; Cui, Wei
arXiv
DOI: 10.48550/arxiv.0704.0452

Isotope Shifts in Beryllium-, Boron-, Carbon-, and Nitrogen-like Ions from Relativistic Configuration Interaction Calculations
text, January 2014

Nazé, C.; Verdebout, S.; Rynkun, P.
arXiv
DOI: 10.48550/arxiv.1406.1720

Chandra X-Ray Spectroscopy of the Focused Wind in the Cygnus X-1 System. II. The Nondip Spectrum in the Low/Hard State - Modulations with Orbital Phase
text, January 2016

Miškovičová, Ivica; Hell, Natalie; Hanke, Manfred
arXiv
DOI: 10.48550/arxiv.1604.00364

Laboratory Measurements of the K-shell transition energies in L-shell ions of Si and S
text, January 2016

Hell, N.; Brown, G. V.; Wilms, J.
arXiv
DOI: 10.48550/arxiv.1609.00403

Chandra Grating Spectroscopy of the X-ray Binary 4U 1700-37 in a Flaring State
text, January 2003

Boroson, B.; Vrtilek, S.; Kallman, T.
arXiv
DOI: 10.48550/arxiv.astro-ph/0303277

Inner-shell Absorption Lines of Fe~VI-- Fe~XVI: A Many-body Perturbation Theory Approach
text, January 2005

Gu, Ming F.; Holczer, Tomer; Behar, Ehud
arXiv
DOI: 10.48550/arxiv.astro-ph/0512410

Absorption Measure Distribution of the Outflow in IRAS 13349+2438: Direct Observation of Thermal Instability?
text, January 2007

Holczer, Tomer; Behar, Ehud; Kaspi, Shai
arXiv
DOI: 10.48550/arxiv.astro-ph/0703351

Works referencing / citing this record:

Relativistic MR-MP Energy Levels for L-shell Ions of Iron
journal, November 2019

Santana, Juan A.; Peña-Cotto, Edgardo L.; Morales Butler, Emmanuel J.
The Astrophysical Journal Supplement Series, Vol. 245, Issue 1
DOI: 10.3847/1538-4365/ab4c3d

Figures / Tables found in this record:

Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.

Similar Records in DOE PAGES and OSTI.GOV collections:

Relativistic MR–MP Energy Levels for L-shell Ions of Silicon

Journal Article Santana, Juan A. ; Lopez-Dauphin, Nahyr A. ; Beiersdorfer, Peter - The Astrophysical Journal. Supplement Series (Online)

Level energies are reported for Si v, Si vi, Si vii, Si viii, Si ix, Si x, Si xi, and Si xii. The energies have been calculated with the relativistic Multi-Reference Møller–Plesset Perturbation Theory method and include valence and K-vacancy states with nl up to 5f. The accuracy of the calculated level energies is established by comparison with the recommended data listed in the National Institute of Standards and Technology (NIST) online database. The average deviation of valence level energies ranges from 0.20 eV in Si v to 0.04 eV in Si xii. For K-vacancy states, the available values recommendedmore »« less
Cited by 5
https://doi.org/10.3847/1538-4365/aa94d2

Full Text Available
HIGH-ACCURACY MR-MP PERTURBATION THEORY ENERGY AND RADIATIVE RATES CALCULATIONS FOR CORE-EXCITED TRANSITIONS IN Fe XVI

Journal Article Diaz, F. ; Vilkas, M. J. ; Ishikawa, Y. ; ... - Astrophysical Journal, Supplement Series

Accurate theoretical energy level, lifetime, and transition probability calculations of core-excited Fe XVI were performed employing the relativistic Multireference Moller-Plesset perturbation theory. In these computations the term energies of the highly excited n {<=} 5 states arising from the configuration 1s {sup 2}2s{sup k} 2p{sup m} 3l {sup p} nl' {sup q}, where k + m + p + q = 9, l {<=} 3 and p + q {<=} 2 are considered, including those of the autoionizing levels with a hole-state in the L-shell. All even and odd parity states of sodium-like iron ion were included for a totalmore »« less
https://doi.org/10.1088/0067-0049/207/1/11
Electron-impact excitation along an isoelectronic sequence: B-like ions

Journal Article Zhang, H L ; Pradhan, A K - Physical Review A; (United States)

A systematic study of collision strengths for the electron-impact excitation of ions along an isoelec- tronic sequence is presented. 105 excitation transitions between 15 fine-structure levels of the eight [ital LS] terms 2[ital s][sup 2]2[ital p]([sup 2][ital P][sup [ital o]]), 2[ital s]2[ital p][sup 2]([sup 4][ital P],[sup 2][ital D],[sup 2][ital S],[sup 2][ital P]), and 2[ital p][sup 3]([sup 4][ital S][sup [ital o]],[sup 2][ital D][sup [ital o]],[sup 2][ital P][sup [ital o]]) in boronlike ions are considered. The calculations include O IV, Ne VI, Mg VIII, Al IX, Si X, S XII, Ar XIV, Ca XVI, and Fe XXII in an eight-term close-coupling expansion,more »« less
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Title: Relativistic MR-MP Energy Levels for L-shell Ions of Sulfur and Argon

Abstract

Citation Formats

Figures / Tables:

K-shell X-ray transition energies of multi-electron ions of silicon and sulfur journal, October 2017

High-Resolution Laboratory Measurements of Coronal Lines in the 198-218 Å Region journal, May 2014

Relativistic configuration interaction calculations on the K x-ray satellites of argon journal, December 2002

Atomic Data and Spectral Line Intensities for S x journal, August 2003

Atomic data and spectral line intensities for S IX journal, September 2003

The Ionized Gas and Nuclear Environment in NGC 3783. I. Time‐averaged 900 Kilosecond Chandra Grating Spectroscopy journal, August 2002

Radiative and Auger Decay of K‐Vacancy Levels in the Ne, Mg, Si, S, Ar, and Ca Isonuclear Sequences journal, July 2008

Relativistic MR-MP energy levels: Low-lying states in the Mg isoelectronic sequence journal, September 2016

Multi-configuration Dirac-Fock and configuration-interaction calculations of Ar 7+ to Ar 17+ ions journal, April 2001

Calcium‐to‐Argon and Nickel‐to‐Argon Abundance Ratios as Tracers of the Source Region of Postflare Loop System Material journal, March 2008

X‐Ray Spectral Study of the Photoionized Stellar Wind in Vela X‐1 journal, November 2006

Wavelengths of 2 l →3 l ′ Transitions in L‐Shell Ions of Iron and Nickel: A Combined Configuration Interaction and Many‐Body Perturbation Theory Approach journal, January 2005

Laboratory Measurements of the K-Shell Transition Energies in L-Shell ions of si and s journal, October 2016

Emission‐Line Spectra of S vii –S xiv in the 20–75 A Wavelength Region journal, June 2005

Relativistic MR-MP calculations of the energy levels and transition probabilities in Ni- to Kr-like Pt ions journal, January 2014

Energies and E1, M1, E2, and M2 transition rates for states of the 2s22p3, 2s2p4, and 2p5 configurations in nitrogen-like ions between F III and Kr XXX journal, March 2014

Relativistic multireference many-body perturbation calculations on multi-valence-electron systems: Benchmarks on Zn-like ions journal, September 2005

Energies, E1, M1, and E2 transition rates, hyperfine structures, and Landé factors for states of the 2s22p2, 2s2p3, and 2p4 configurations in carbon-like ions between F IV and Ni XXIII journal, November 2011

Atomic data and spectral line intensities for Ar XI journal, May 2006

Isotope shifts in beryllium-, boron-, carbon-, and nitrogen-like ions from relativistic configuration interaction calculations journal, September 2014

Atomic data and spectral line intensities for Ar XII journal, March 2005

THERMODYNAMIC SPECTRUM OF SOLAR FLARES BASED ON SDO /EVE OBSERVATIONS: TECHNIQUES AND FIRST RESULTS journal, March 2016

Chandra Grating Spectroscopy of the X‐Ray Binary 4U 1700−37 in a Flaring State journal, July 2003

Dramatic Variability of X‐Ray Absorption Lines in the Black Hole Candidate Cygnus X‐1 journal, July 2007

Ab initio oscillator strengths and transition probabilities of transitions from 2s22p23l and 2s2p33l in S X journal, January 2005

Energies and E1, M1, E2, M2 transition rates for states of the 2s22p, 2s2p2, and 2p3 configurations in boron-like ions between N III and Zn XXVI journal, July 2012

Emission‐Line Spectra of Ar ix –Ar xvi in the Soft X‐Ray Region 20–50 A journal, June 2003

Energy Levels of Highly Ionized Ar XIV journal, October 2006

Multiconfigurational Dirac-Fock studies of two-electron ions. II. Radiative corrections and comparison with experiment journal, February 1987

SYSTEMATIC CALCULATIONS OF ENERGY LEVELS AND TRANSITION RATES OF BE-LIKE IONS WITH Z = 10–30 USING A COMBINED CONFIGURATION INTERACTION AND MANY-BODY PERTURBATION THEORY APPROACH journal, May 2015

Relativistic CI calculations of spectroscopic data for the and configurations in Ne-like ions between Mg III and Kr XXVII journal, January 2014

Experimental M1 Transition Rates of Coronal Lines from Ar x , Ar xiv , and Ar xv journal, September 2000

An adjusted boxplot for skewed distributions journal, August 2008

The Mysterious case of the Solar Argon Abundance near Sunspots in Flares journal, June 2016

Soft X-Ray Emission Lines of s Vii-S xiv in Procyon journal, December 2012

Storage-ring measurement of the hyperfine-induced 2 s 2 p 3 P 0 → 2 s 2 1 S 0 transition rate in berylliumlike sulfur journal, January 2012

Chandra X-ray spectroscopy of focused wind in the Cygnus X-1 system : II. The non-dip spectrum in the low/hard state – modulations with orbital phase journal, May 2016

New classifications of emission lines of highly ionized phosphorus and sulphur journal, April 1970

R -matrix electron-impact excitation data for the B-like iso-electronic sequence journal, November 2012

SYSTEMATIC CALCULATIONS OF ENERGY LEVELS AND TRANSITION RATES OF C-LIKE IONS WITH Z = 13-36 journal, January 2014

R -matrix electron-impact excitation data for astrophysically abundant sulphur ions journal, September 2011

Revealing the Dusty Warm Absorber in MCG −6-30-15 with the [ITAL]Chandra[/ITAL] High-Energy Transmission Grating journal, June 2001

Line strengths of QED-sensitive forbidden transitions in B-, Al-, F- and Cl-like ions journal, May 2018

Dirac R-matrix calculation for electron-impact excitation of S xiii journal, July 2013

Relativistic MR–MP Energy Levels for L-shell Ions of Silicon journal, January 2018

Relativistic R -matrix close-coupling method based on the effective Hamiltonian in many-body perturbation theory journal, June 2007

HIGH-ACCURACY MR-MP PERTURBATION THEORY ENERGY AND RADIATIVE RATES CALCULATIONS FOR CORE-EXCITED TRANSITIONS IN Fe XVI journal, July 2013

Relativistic multireference many-body perturbation theory for quasidegenerate systems: Energy levels of ions of the oxygen isoelectronic sequence journal, October 1999

Energy levels and radiative rates for transitions in Ar XIII, Ar XIV and Ar XV journal, June 2005

Inner‐Shell Absorption Lines of Fe vi –Fe xvi : A Many‐Body Perturbation Theory Approach journal, April 2006

THEORETICAL WAVELENGTHS OF Fe XVI L-SHELL TRANSITIONS AND COMPARISON WITH LABORATORY MEASUREMENTS AND CHANDRA OBSERVATIONS OF CAPELLA journal, January 2012

R -matrix electron-impact excitation calculations along the F-like iso-electronic sequence journal, July 2007

Foil excited K X-ray transitions in few-electron sulphur ions journal, November 1980

The XMM-Newton view of stellar coronae: High-resolution X-ray spectroscopy of Capella journal, January 2001

Relativistic multireference many-body perturbation theory for open-shell ions with multiple valence shell electrons: the transition rates and lifetimes of the excited levels in chlorinelike Fe X journal, March 2010

Combination of the many-body perturbation theory with the configuration-interaction method journal, November 1996

Sulfur ix to xiii Spectral Measurments Between 170 and 500 Å journal, March 2009

CHIANTI - an atomic database for emission lines: I. Wavelengths greater than 50 Å journal, October 1997

Absorption Measure Distribution of the Outflow in IRAS 13349+2438: Direct Observation of Thermal Instability? journal, July 2007

Highly Ionized Spectra of the Transition Sulfur journal, November 2000

Weighted oscillator strengths and lifetimes for the S XIV spectrum journal, May 2009

Development of a configuration-interaction plus all-order method for atomic calculations journal, July 2009

CHIANTI – An atomic database for emission lines. Version 8 journal, October 2015

Extreme‐Ultraviolet Emission Lines of S x in Solar Flare and Active Region Spectra journal, January 2004

Intensity Ratios between the 2 s 2 1 S 0 –2 s 2 p 3 P 1 and 2 s 2 p 1 P 1 –2 p 2 1 D 2 Transitions in Be‐like Ions as Electron Temperature Indicators for Solar Upper Atmosphere Plasmas journal, August 2001

R -matrix electron-impact excitation data for the Ne-like iso-electronic sequence journal, July 2010

Electron density diagnostic potential of Ar XIV soft X-ray emission lines journal, December 2006

Identification and analysis of soft X-ray lines of Ar xiii-Ar xvi in laboratory and astrophysical plasmas journal, May 2004

Atomic data and spectral line intensities for Ar XV journal, March 2008

Wavelengths, Energy Levels, Lifetimes, and Weighted Oscillator Strengths for the s viii Spectrum journal, September 2011

Atomic data and spectral line intensities for S XIII journal, January 2008

Extreme‐Ultraviolet Emission Lines of S xii in Solar Active Region and Flare Spectra journal, February 2002

Spin-forbidden electric dipole transitions of highly ionized argon journal, July 2002

Resonance and intercombination lines in Mg-like ions of atomic numbers Z = 13 – 92 journal, February 2015

Electron impact excitation of N-like ions from the ICFT R -matrix calculation journal, March 2018

Production and decay of sulfur excited species in an electron-cyclotron-resonance ion-source plasma journal, September 2009

K-shell X-ray transition energies of multi-electron ions of silicon and sulfur
journal, October 2017

High-Resolution Laboratory Measurements of Coronal Lines in the 198-218 Å Region
journal, May 2014

Relativistic configuration interaction calculations on the K x-ray satellites of argon
journal, December 2002

Atomic Data and Spectral Line Intensities for S x
journal, August 2003

Atomic data and spectral line intensities for S IX
journal, September 2003

The Ionized Gas and Nuclear Environment in NGC 3783. I. Time‐averaged 900 Kilosecond Chandra Grating Spectroscopy
journal, August 2002

Radiative and Auger Decay of K‐Vacancy Levels in the Ne, Mg, Si, S, Ar, and Ca Isonuclear Sequences
journal, July 2008

Relativistic MR-MP energy levels: Low-lying states in the Mg isoelectronic sequence
journal, September 2016

Multi-configuration Dirac-Fock and configuration-interaction calculations of Ar ⁷⁺ to Ar ¹⁷⁺ ions
journal, April 2001

Calcium‐to‐Argon and Nickel‐to‐Argon Abundance Ratios as Tracers of the Source Region of Postflare Loop System Material
journal, March 2008

X‐Ray Spectral Study of the Photoionized Stellar Wind in Vela X‐1
journal, November 2006

Wavelengths of 2 l →3 l ′ Transitions in L‐Shell Ions of Iron and Nickel: A Combined Configuration Interaction and Many‐Body Perturbation Theory Approach
journal, January 2005

Laboratory Measurements of the K-Shell Transition Energies in L-Shell ions of si and s
journal, October 2016

Emission‐Line Spectra of S vii –S xiv in the 20–75 A Wavelength Region
journal, June 2005

Relativistic MR-MP calculations of the energy levels and transition probabilities in Ni- to Kr-like Pt ions
journal, January 2014

Energies and E1, M1, E2, and M2 transition rates for states of the 2s22p3, 2s2p4, and 2p5 configurations in nitrogen-like ions between F III and Kr XXX
journal, March 2014

Relativistic multireference many-body perturbation calculations on multi-valence-electron systems: Benchmarks on Zn-like ions
journal, September 2005

Energies, E1, M1, and E2 transition rates, hyperfine structures, and Landé factors for states of the 2s22p2, 2s2p3, and 2p4 configurations in carbon-like ions between F IV and Ni XXIII
journal, November 2011

Atomic data and spectral line intensities for Ar XI
journal, May 2006

Isotope shifts in beryllium-, boron-, carbon-, and nitrogen-like ions from relativistic configuration interaction calculations
journal, September 2014

Atomic data and spectral line intensities for Ar XII
journal, March 2005

THERMODYNAMIC SPECTRUM OF SOLAR FLARES BASED ON SDO /EVE OBSERVATIONS: TECHNIQUES AND FIRST RESULTS
journal, March 2016

Chandra Grating Spectroscopy of the X‐Ray Binary 4U 1700−37 in a Flaring State
journal, July 2003

Dramatic Variability of X‐Ray Absorption Lines in the Black Hole Candidate Cygnus X‐1
journal, July 2007

Ab initio oscillator strengths and transition probabilities of transitions from 2s22p23l and 2s2p33l in S X
journal, January 2005

Energies and E1, M1, E2, M2 transition rates for states of the 2s22p, 2s2p2, and 2p3 configurations in boron-like ions between N III and Zn XXVI
journal, July 2012

Emission‐Line Spectra of Ar ix –Ar xvi in the Soft X‐Ray Region 20–50 A
journal, June 2003

Energy Levels of Highly Ionized Ar XIV
journal, October 2006

Multiconfigurational Dirac-Fock studies of two-electron ions. II. Radiative corrections and comparison with experiment
journal, February 1987

SYSTEMATIC CALCULATIONS OF ENERGY LEVELS AND TRANSITION RATES OF BE-LIKE IONS WITH Z = 10–30 USING A COMBINED CONFIGURATION INTERACTION AND MANY-BODY PERTURBATION THEORY APPROACH
journal, May 2015

Relativistic CI calculations of spectroscopic data for the and configurations in Ne-like ions between Mg III and Kr XXVII
journal, January 2014

Experimental M1 Transition Rates of Coronal Lines from Ar x , Ar xiv , and Ar xv
journal, September 2000

An adjusted boxplot for skewed distributions
journal, August 2008

The Mysterious case of the Solar Argon Abundance near Sunspots in Flares
journal, June 2016

Soft X-Ray Emission Lines of s Vii-S xiv in Procyon
journal, December 2012

Storage-ring measurement of the hyperfine-induced $2 s 2 p$ $^{3} P_{0} \to 2 s^{2}$ $^{1} S_{0}$ transition rate in berylliumlike sulfur
journal, January 2012

Chandra X-ray spectroscopy of focused wind in the Cygnus X-1 system : II. The non-dip spectrum in the low/hard state – modulations with orbital phase
journal, May 2016

New classifications of emission lines of highly ionized phosphorus and sulphur
journal, April 1970

R -matrix electron-impact excitation data for the B-like iso-electronic sequence
journal, November 2012

SYSTEMATIC CALCULATIONS OF ENERGY LEVELS AND TRANSITION RATES OF C-LIKE IONS WITH Z = 13-36
journal, January 2014

R -matrix electron-impact excitation data for astrophysically abundant sulphur ions
journal, September 2011

Revealing the Dusty Warm Absorber in MCG −6-30-15 with the [ITAL]Chandra[/ITAL] High-Energy Transmission Grating
journal, June 2001

Line strengths of QED-sensitive forbidden transitions in B-, Al-, F- and Cl-like ions
journal, May 2018

Dirac R-matrix calculation for electron-impact excitation of S xiii
journal, July 2013

Relativistic MR–MP Energy Levels for L-shell Ions of Silicon
journal, January 2018

Relativistic $R$ -matrix close-coupling method based on the effective Hamiltonian in many-body perturbation theory
journal, June 2007

HIGH-ACCURACY MR-MP PERTURBATION THEORY ENERGY AND RADIATIVE RATES CALCULATIONS FOR CORE-EXCITED TRANSITIONS IN Fe XVI
journal, July 2013

Relativistic multireference many-body perturbation theory for quasidegenerate systems: Energy levels of ions of the oxygen isoelectronic sequence
journal, October 1999

Energy levels and radiative rates for transitions in Ar XIII, Ar XIV and Ar XV
journal, June 2005

Inner‐Shell Absorption Lines of Fe vi –Fe xvi : A Many‐Body Perturbation Theory Approach
journal, April 2006

THEORETICAL WAVELENGTHS OF Fe XVI L-SHELL TRANSITIONS AND COMPARISON WITH LABORATORY MEASUREMENTS AND CHANDRA OBSERVATIONS OF CAPELLA
journal, January 2012

R -matrix electron-impact excitation calculations along the F-like iso-electronic sequence
journal, July 2007

Foil excited K X-ray transitions in few-electron sulphur ions
journal, November 1980

The XMM-Newton view of stellar coronae: High-resolution X-ray spectroscopy of Capella
journal, January 2001

Relativistic multireference many-body perturbation theory for open-shell ions with multiple valence shell electrons: the transition rates and lifetimes of the excited levels in chlorinelike Fe X
journal, March 2010

Combination of the many-body perturbation theory with the configuration-interaction method
journal, November 1996

Sulfur ix to xiii Spectral Measurments Between 170 and 500 Å
journal, March 2009

CHIANTI - an atomic database for emission lines: I. Wavelengths greater than 50 Å
journal, October 1997

Absorption Measure Distribution of the Outflow in IRAS 13349+2438: Direct Observation of Thermal Instability?
journal, July 2007

Highly Ionized Spectra of the Transition Sulfur
journal, November 2000

Weighted oscillator strengths and lifetimes for the S XIV spectrum
journal, May 2009

Development of a configuration-interaction plus all-order method for atomic calculations
journal, July 2009

CHIANTI – An atomic database for emission lines. Version 8
journal, October 2015

Extreme‐Ultraviolet Emission Lines of S x in Solar Flare and Active Region Spectra
journal, January 2004

Intensity Ratios between the 2 s ² ¹ S ₀ –2 s 2 p ³ P ₁ and 2 s ² p ¹ P ₁ –2 p ² ¹ D ₂ Transitions in Be‐like Ions as Electron Temperature Indicators for Solar Upper Atmosphere Plasmas
journal, August 2001

R -matrix electron-impact excitation data for the Ne-like iso-electronic sequence
journal, July 2010

Electron density diagnostic potential of Ar XIV soft X-ray emission lines
journal, December 2006

Identification and analysis of soft X-ray lines of Ar xiii-Ar xvi in laboratory and astrophysical plasmas
journal, May 2004

Atomic data and spectral line intensities for Ar XV
journal, March 2008

Wavelengths, Energy Levels, Lifetimes, and Weighted Oscillator Strengths for the s viii Spectrum
journal, September 2011

Atomic data and spectral line intensities for S XIII
journal, January 2008

Extreme‐Ultraviolet Emission Lines of S xii in Solar Active Region and Flare Spectra
journal, February 2002

Spin-forbidden electric dipole transitions of highly ionized argon
journal, July 2002

Resonance and intercombination lines in Mg-like ions of atomic numbers $Z = 13 - 92$
journal, February 2015

Electron impact excitation of N-like ions from the ICFT R -matrix calculation
journal, March 2018

Production and decay of sulfur excited species in an electron-cyclotron-resonance ion-source plasma
journal, September 2009

High-resolution X-ray spectroscopy of Procyon by Chandra and XMM-Newton
journal, June 2002

Calculations with spectroscopic accuracy: energies, transition rates, and Landé g _J -factors in the carbon isoelectronic sequence from Ar XIII to Zn XXV
journal, March 2014

CHIANTI – an atomic database for emission lines: III. Continuum radiation and extension of the ion database
journal, March 1999

Dramatic Variability of X-ray Absorption Lines in the Black Hole Candidate Cygnus X-1
text, January 2007