Single-photon photoionization of oxygen-like Ne III

Nahar, Sultana N.; Covington, Aaron M.; Kilcoyne, David; Davis, Vern T.; Thompson, Jeff S.; Hernandez, E. M.; Antillon, A.; Juarez, A. M.; Morales-Mori, A.; Hinojosa, Guillermo

doi:10.1016/j.ijms.2019.05.009

Title: Single-photon photoionization of oxygen-like Ne III

Abstract

Here, we offer a theoretical and experimental study of the single-photon photoionization of Ne III. The high photon flux and the high-resolution capabilities of the Advanced Light Source at the LBNL were employed to measure absolute photoionization cross sections. The resulting spectrum has been benchmarked against high accuracy relativistic Breit-Pauli R-matrix calculations. Additionally, a large close-coupling wave function expansion which comprises up to 58 fine-structure levels of the residual ion Ne IV of configurations 2s²2p³, 2s²p⁴, 2p⁵, 2s²2p²3s, 2s²2p²3p and 2s²2p²3d was included. A complete identification of the measured features was achieved by considering seven low-lying levels of Ne III. We found that the photoionization cross-section (σ_PI) exhibits the presence of prominent resonances in the lowenergy region near the ionization thresholds that correspond to low-lying levels. These include highpeak narrow resonances with almost zero background introduced by relativistic effects. However, there does not exist a significant contribution to σ_PI from relativistic effects at the high-energy interval of the present study.

Authors:

Nahar, Sultana N. ^[1]; Covington, Aaron M. ^[2]; Kilcoyne, David ^[3]; Davis, Vern T. ^[2]; Thompson, Jeff S. ^[2]; Hernandez, E. M. ^[4]; Antillon, A. ^[4]; Juarez, A. M. ^[4]; Morales-Mori, A. ^[4]; Hinojosa, Guillermo ^[4]

The Ohio State Univ., Columbus, OH (United States)
Univ. of Nevada, Reno, NV (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Universidad Nacional Autónoma de México, Cuernavaca (Mexico)

Publication Date:: 2019-05-16

Research Org.:: Univ. of Nevada, Reno, NV (United States)

Sponsoring Org.:: USDOE National Nuclear Security Administration (NNSA), Office of Defense Science (NA-113); USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:: 1527372

Alternate Identifier(s):: OSTI ID: 1779999

Grant/Contract Number:: NA0002075; AC02-05CH11231; SC0012331

Resource Type:: Accepted Manuscript

Journal Name:: International Journal of Mass Spectrometry

Additional Journal Information:: Journal Volume: 443; Journal Issue: C; Journal ID: ISSN 1387-3806

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; photoionization; Isoelectronic to oxygen; Opacity; Auto-ionizing states; Synchrotron radiation; Soft X-rays; Breit-pauli; R-matrix; Ab-initio; PACS: 31.15.A- 31.30.jc; 32.30.Rj; 32.70.Fw; 32.80.Ee; 32.80.Fb; 32.80.Zb; 95.30.Ky; 97.10.Ex

Citation Formats


                    Nahar, Sultana N., Covington, Aaron M., Kilcoyne, David, Davis, Vern T., Thompson, Jeff S., Hernandez, E. M., Antillon, A., Juarez, A. M., Morales-Mori, A., and Hinojosa, Guillermo. Single-photon photoionization of oxygen-like Ne III.  United States: N. p., 2019. 
Web.  doi:10.1016/j.ijms.2019.05.009.

Copy to clipboard


                    Nahar, Sultana N., Covington, Aaron M., Kilcoyne, David, Davis, Vern T., Thompson, Jeff S., Hernandez, E. M., Antillon, A., Juarez, A. M., Morales-Mori, A., & Hinojosa, Guillermo. Single-photon photoionization of oxygen-like Ne III.  United States.  https://doi.org/10.1016/j.ijms.2019.05.009

Copy to clipboard


                    Nahar, Sultana N., Covington, Aaron M., Kilcoyne, David, Davis, Vern T., Thompson, Jeff S., Hernandez, E. M., Antillon, A., Juarez, A. M., Morales-Mori, A., and Hinojosa, Guillermo. Thu .  
"Single-photon photoionization of oxygen-like Ne III".  United States.  https://doi.org/10.1016/j.ijms.2019.05.009.  https://www.osti.gov/servlets/purl/1527372.

Copy to clipboard


                    
@article{osti_1527372,

  title        = {Single-photon photoionization of oxygen-like Ne III},

  author       = {Nahar, Sultana N. and Covington, Aaron M. and Kilcoyne, David and Davis, Vern T. and Thompson, Jeff S. and Hernandez, E. M. and Antillon, A. and Juarez, A. M. and Morales-Mori, A. and Hinojosa, Guillermo},

  abstractNote = {Here, we offer a theoretical and experimental study of the single-photon photoionization of Ne III. The high photon flux and the high-resolution capabilities of the Advanced Light Source at the LBNL were employed to measure absolute photoionization cross sections. The resulting spectrum has been benchmarked against high accuracy relativistic Breit-Pauli R-matrix calculations. Additionally, a large close-coupling wave function expansion which comprises up to 58 fine-structure levels of the residual ion Ne IV of configurations 2s22p3, 2s2p4, 2p5, 2s22p23s, 2s22p23p and 2s22p23d was included. A complete identification of the measured features was achieved by considering seven low-lying levels of Ne III. We found that the photoionization cross-section (σPI) exhibits the presence of prominent resonances in the lowenergy region near the ionization thresholds that correspond to low-lying levels. These include highpeak narrow resonances with almost zero background introduced by relativistic effects. However, there does not exist a significant contribution to σPI from relativistic effects at the high-energy interval of the present study.},

  doi          = {10.1016/j.ijms.2019.05.009},

  journal      = {International Journal of Mass Spectrometry},

  number       = C,

  volume       = 443,

  place        = {United States},

  year         = {2019},

  month        = {5}

}

Copy to clipboard

Journal Article:

Free Publicly Available Full Text

Accepted Manuscript (Publisher)

Accepted Manuscript (DOE)

Publisher's Version of Record

https://doi.org/10.1016/j.ijms.2019.05.009

Other availability

Search WorldCat to find libraries that may hold this journal

Save / Share:

Export Metadata

Save to My Library

Works referenced in this record:

RMATRX1: Belfast atomic R-matrix codes
dataset, January 2019

Berrington, Keith A.
Mendeley
DOI: 10.17632/vxdjf4c8cd.1

Photoionized plasmas induced in neon with extreme ultraviolet and soft X-ray pulses produced using low and high energy laser systems
journal, April 2015

Bartnik, A.; Wachulak, P.; Fok, T.
Physics of Plasmas, Vol. 22, Issue 4
DOI: 10.1063/1.4919024

A higher-than-predicted measurement of iron opacity at solar interior temperatures
journal, December 2014

Bailey, J. E.; Nagayama, T.; Loisel, G. P.
Nature, Vol. 517, Issue 7532
DOI: 10.1038/nature14048

Phosphorus in the Young Supernova Remnant Cassiopeia A
journal, December 2013

Koo, B. -C.; Lee, Y. -H.; Moon, D. -S.
Science, Vol. 342, Issue 6164
DOI: 10.1126/science.1243823

PHOTOIONIZATION MODELS FOR THE SEMI-FORBIDDEN C iii] 1909 EMISSION IN STAR-FORMING GALAXIES
journal, December 2016

Jaskot, A. E.; Ravindranath, S.
The Astrophysical Journal, Vol. 833, Issue 2
DOI: 10.3847/1538-4357/833/2/136

Doubly-charged ions in the planetary ionospheres: a review
journal, January 2011

Thissen, Roland; Witasse, Olivier; Dutuit, Odile
Physical Chemistry Chemical Physics, Vol. 13, Issue 41
DOI: 10.1039/c1cp21957j

Photoionisation of ions with synchrotron radiation: from ions in space to atoms in cages
journal, November 2015

Schippers, Stefan; Kilcoyne, A. L. David; Phaneuf, Ronald A.
Contemporary Physics, Vol. 57, Issue 2
DOI: 10.1080/00107514.2015.1109771

Photoionization of atomic ions
journal, September 2001

West, J. B.
Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 34, Issue 18
DOI: 10.1088/0953-4075/34/18/201

Close-coupling calculations for photoionisation cross sections of neon ions: Ne II, Ne III and Ne IV
journal, October 1979

Pradhan, A. K.
Journal of Physics B: Atomic and Molecular Physics, Vol. 12, Issue 20
DOI: 10.1088/0022-3700/12/20/012

Photoionization of ${Ne}^{+}$ using synchrotron radiation
journal, December 2002

Covington, A. M.; Aguilar, A.; Covington, I. R.
Physical Review A, Vol. 66, Issue 6
DOI: 10.1103/PhysRevA.66.062710

Photoionization of ions of the nitrogen isoelectronic sequence: experiment and theory for F ²⁺ and Ne ³⁺
journal, February 2005

Aguilar, A.; Emmons, E. D.; Gharaibeh, M. F.
Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 38, Issue 4
DOI: 10.1088/0953-4075/38/4/003

Photoionization of singly and doubly charged neon ions following inner-shell excitation
journal, December 2001

Yamaoka, H.; Oura, M.; Kawatsura, K.
Physical Review A, Vol. 65, Issue 1
DOI: 10.1103/PhysRevA.65.012709

Photoionization of Ne Atoms and Ne ⁺ Ions Near the K Edge: PrecisionSpectroscopy and Absolute Cross-sections
journal, February 2017

Müller, Alfred; Bernhardt, Dietrich; Borovik, Alexander
The Astrophysical Journal, Vol. 836, Issue 2
DOI: 10.3847/1538-4357/836/2/166

Photoionization of Be-like N ^{3 +} and Ne ^{6 +} ions: features of Be isoelectronic sequences of Z ⩽ 10
journal, August 2012

Kim, Dae-Soung; Kwon, Duck-Hee
Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 45, Issue 18
DOI: 10.1088/0953-4075/45/18/185201

Total photoionization cross sections of atomic oxygen from threshold to 44.3 A ̊
journal, December 1988

Angel, G. C.; Samson, James A. R.
Physical Review A, Vol. 38, Issue 11
DOI: 10.1103/PhysRevA.38.5578

Photoionization cross sections and oscillator strengths for oxygen ions: O I-O VII
journal, November 1998

Nahar, Sultana N.
Physical Review A, Vol. 58, Issue 5
DOI: 10.1103/PhysRevA.58.3766

Autoionization and photoionization of $O (^{1} D)$
journal, October 2000

Flesch, R.; Schürmann, M. C.; Plenge, J.
Physical Review A, Vol. 62, Issue 5
DOI: 10.1103/PhysRevA.62.052723

E1, E2 and M1 transition parameters for some levels over ionization limit of Ne III
journal, July 2016

Eser, Selda; Özdemir, Leyla
The European Physical Journal Plus, Vol. 131, Issue 7
DOI: 10.1140/epjp/i2016-16227-y

Atomic data for opacity calculations. I. General description
journal, December 1987

Seaton, M. J.
Journal of Physics B: Atomic and Molecular Physics, Vol. 20, Issue 23
DOI: 10.1088/0022-3700/20/23/026

Atomic data for opacity calculations. II. Computational methods
journal, December 1987

Berrington, K. A.; Burke, P. G.; Butler, K.
Journal of Physics B: Atomic and Molecular Physics, Vol. 20, Issue 23
DOI: 10.1088/0022-3700/20/23/027

RMATRX1: Belfast atomic R-matrix codes
journal, December 1995

Berrington, Keith A.; Eissner, Werner B.; Norrington, Patrick H.
Computer Physics Communications, Vol. 92, Issue 2-3
DOI: 10.1016/0010-4655(95)00123-8

Unified treatment of electron-ion recombination in the close-coupling approximation
journal, March 1994

Nahar, Sultana N.; Pradhan, Anil K.
Physical Review A, Vol. 49, Issue 3
DOI: 10.1103/PhysRevA.49.1816

Close-coupling R -matrix calculations for electron-ion recombination cross sections
journal, January 1999

Zhang, Hong Lin; Nahar, Sultana N.; Pradhan, Anil K.
Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 32, Issue 6
DOI: 10.1088/0953-4075/32/6/010

Techniques for the calculation of atomic structures and radiative data including relativistic corrections
journal, November 1974

Eissner, W.; Jones, M.; Nussbaumer, H.
Computer Physics Communications, Vol. 8, Issue 4
DOI: 10.1016/0010-4655(74)90019-8

Atomic data from the Iron Project: LIII. Relativistic allowed and forbidden transition probabilities for Fe xvii
journal, September 2003

Nahar, Sultana N.; Eissner, Werner; Chen, Guo-Xin
Astronomy & Astrophysics, Vol. 408, Issue 2
DOI: 10.1051/0004-6361:20030945

Single-photon single ionization of W ⁺ ions: experiment and theory
journal, December 2015

Müller, A.; Schippers, S.; Hellhund, J.
Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 48, Issue 23
DOI: 10.1088/0953-4075/48/23/235203

Single photoionization of the Zn ii ion in the photon energy range 17.5–90.0 eV: experiment and theory
journal, June 2017

Hinojosa, G.; Davis, V. T.; Covington, A. M.
Monthly Notices of the Royal Astronomical Society, Vol. 470, Issue 4
DOI: 10.1093/mnras/stx1534

An investigation of the structure near the L _2,3 edges of argon, the M _4,5 edges of krypton and the N _4,5 edges of xenon, using electron impact with high resolution
journal, August 1977

King, G. C.; Tronc, M.; Read, F. H.
Journal of Physics B: Atomic and Molecular Physics, Vol. 10, Issue 12
DOI: 10.1088/0022-3700/10/12/026

High-resolution study of ${}^{1}$ $P^{o}$ double-excitation states in helium
journal, March 1996

Domke, M.; Schulz, K.; Remmers, G.
Physical Review A, Vol. 53, Issue 3
DOI: 10.1103/PhysRevA.53.1424

New Absorption Spectra of Atomic and Molecular Oxygen in the Vacuum Ultraviolet. II. Rydberg Series from O I( ¹ D ₂ ) and O I( ¹ S ₀ ) Metastable States
journal, December 1967

Huffman, R. E.; Larrabee, J. C.; Tanaka, Y.
The Journal of Chemical Physics, Vol. 47, Issue 11
DOI: 10.1063/1.1701654

New Absorption Spectra of Atomic and Molecular Oxygen in the Vacuum Ultraviolet. I. Rydberg Series from O I Ground State and New Excited O ₂ Bands
journal, March 1967

Huffman, R. E.; Larrabee, J. C.; Tanaka, Y.
The Journal of Chemical Physics, Vol. 46, Issue 6
DOI: 10.1063/1.1841026

Similar Records in DOE PAGES and OSTI.GOV collections:

Photoionization cross sections of O II, O III, O IV, and O V: Benchmarking R-matrix theory and experiments

Journal Article Nahar, Sultana N - Physical Review. A

For crucial tests between theory and experiment, ab initio close-coupling calculations are carried out for photoionization of several oxygen ions: O II, O III, O IV, and O V. The relativistic fine-structure and resonance effects are studied using the R matrix and its relativistic variant, the Breit-Pauli R-matrix (BPRM) approximations. Extremely detailed comparison is made with high-resolution experimental measurements carried out in three different setups: Advanced Light Source at Berkeley, synchrotron radiation experiment with a new modulator at University of Aarhues, and synchrotron radiation experiment at University of Paris-Sud. The comparisons illustrate physical effects in photoionization such as (i) finemore »« less
https://doi.org/10.1103/PhysRevA.69.042714
Low-energy fine-structure resonances in photoionization of O ii

Journal Article Nahar, Sultana N ; Pradhan, Anil K ; Montenegro, Maximiliano ; ... - Physical Review. A

Resonant features in low-energy photoionization cross sections are reported in coupled-channel calculations for O ii including relativistic fine structure. The calculations reveal extensive near-threshold resonant structures in the small energy region between the fine structure levels of the ground state 2p{sup 2}({sup 3}P{sub 0,1,2}) of the residual ion O iii. Although the resonances have not yet been observed, they are similar to other experimentally observed features. They are expected to significantly enhance the very-low-temperature dielectronic recombination rates, potentially leading to the resolution of an outstanding nebular abundances anomaly. Higher energy partial and total photoionization cross sections of the ground configurationmore »« less
https://doi.org/10.1103/PHYSREVA.82.065401
Photoionization of Ne{sup +} using synchrotron radiation

Journal Article Covington, A M ; Aguilar, A ; Covington, I R ; ... - Physical Review. A

Absolute measurements of cross sections for photoionization of a statistical admixture of Ne{sup +} in the {sup 2}P{sub 3/2}{sup o} ground state and the {sup 2}P{sub 1/2}{sup o} metastable state are reported in the energy range 40-71 eV at photon energy resolutions ranging from 22 meV to 2 meV. The experiments were performed using synchrotron radiation from an undulator beamline of the Advanced Light Source with a newly developed ion-photon-beam endstation. The data are characterized by multiple Rydberg series of autoionizing resonances superimposed upon a direct photoionization background cross section where some of the observed resonance line shapes show evidencemore »« less
https://doi.org/10.1103/PhysRevA.66.062710
Photoionization of the ground and first two metastable levels for Sc III: Configuration-interaction and relativistic effects

Journal Article Zeng, Jiaolong ; Department of Applied Physics, National University of Defense Technology, Changsha 410073, People's Republic of China ; Zhao, Gang ; ... - Physical Review. A

The photoionization cross section of the ground ([Ne]3s{sup 2}3p{sup 6}3d {sup 2}D{sub 3/2}) and first two metastable ([Ne]3s{sup 2}3p{sup 6}3d {sup 2}D{sub 5/2} and [Ne]3s{sup 2}3p{sup 6}4s {sup 2}S{sub 1/2}) levels of potassiumlike Sc III have been studied using fully relativistic R-matrix method. To show the effects of configuration interaction on the cross section, we first perform a nonrelativistic R-matrix calculation. The detailed structures and resonances of the cross section obtained by the fully relativistic method in the region of 3p{yields}3d and 3p{yields}4s resonances are described and analyzed in some detail. The positions, autoionization widths, and oscillator strengths of somemore »« less
https://doi.org/10.1103/PhysRevA.68.022714
Photoionization of potassiumlike transition-metal ions: Ti{sup 3+} to Fe{sup 7+}

Journal Article Sossah, A M ; Zhou, H -L ; Manson, S T - Physical Review. A

Photoionization cross-section calculations are performed on potassiumlike transition metal ions (Ti{sup 3+}, V{sup 4+}, Cr{sup 5+}, Mn{sup 6+}, and Fe{sup 7+}) using both nonrelativistic (LS-coupling) and relativistic (Breit-Pauli) R-matrix methods for the ground ([Ne]3s{sup 2}3p{sup 6}3d {sup 2}D{sub 3/2}{sup e}) and the first excited ([Ne]3s{sup 2}3p{sup 6}3d {sup 2}D{sub 5/2}{sup e}) states of each of the five ions, along with the excited 4s {sup 2}S state of Ti{sup 3+}. Photon energies up to the first 3p ionization threshold are considered. The results show that for Ti{sup 3+}, the cross sections are dominated by the giant (3p{yields}3d) resonances which are analyzedmore »« less
https://doi.org/10.1103/PHYSREVA.82.043416

Similar Records

Title: Single-photon photoionization of oxygen-like Ne III

Abstract

Citation Formats

RMATRX1: Belfast atomic R-matrix codes dataset, January 2019

Photoionized plasmas induced in neon with extreme ultraviolet and soft X-ray pulses produced using low and high energy laser systems journal, April 2015

A higher-than-predicted measurement of iron opacity at solar interior temperatures journal, December 2014

Phosphorus in the Young Supernova Remnant Cassiopeia A journal, December 2013

PHOTOIONIZATION MODELS FOR THE SEMI-FORBIDDEN C iii] 1909 EMISSION IN STAR-FORMING GALAXIES journal, December 2016

Doubly-charged ions in the planetary ionospheres: a review journal, January 2011

Photoionisation of ions with synchrotron radiation: from ions in space to atoms in cages journal, November 2015

Photoionization of atomic ions journal, September 2001

Close-coupling calculations for photoionisation cross sections of neon ions: Ne II, Ne III and Ne IV journal, October 1979

Photoionization of Ne + using synchrotron radiation journal, December 2002

Photoionization of ions of the nitrogen isoelectronic sequence: experiment and theory for F 2+ and Ne 3+ journal, February 2005

Photoionization of singly and doubly charged neon ions following inner-shell excitation journal, December 2001

Photoionization of Ne Atoms and Ne + Ions Near the K Edge: PrecisionSpectroscopy and Absolute Cross-sections journal, February 2017

Photoionization of Be-like N 3 + and Ne 6 + ions: features of Be isoelectronic sequences of Z ⩽ 10 journal, August 2012

Total photoionization cross sections of atomic oxygen from threshold to 44.3 A ̊ journal, December 1988

Photoionization cross sections and oscillator strengths for oxygen ions: O I-O VII journal, November 1998

Autoionization and photoionization of O ( 1 D ) journal, October 2000

E1, E2 and M1 transition parameters for some levels over ionization limit of Ne III journal, July 2016

Atomic data for opacity calculations. I. General description journal, December 1987

Atomic data for opacity calculations. II. Computational methods journal, December 1987

RMATRX1: Belfast atomic R-matrix codes journal, December 1995

Unified treatment of electron-ion recombination in the close-coupling approximation journal, March 1994

Close-coupling R -matrix calculations for electron-ion recombination cross sections journal, January 1999

Techniques for the calculation of atomic structures and radiative data including relativistic corrections journal, November 1974

Atomic data from the Iron Project: LIII. Relativistic allowed and forbidden transition probabilities for Fe xvii journal, September 2003

Single-photon single ionization of W + ions: experiment and theory journal, December 2015

Single photoionization of the Zn ii ion in the photon energy range 17.5–90.0 eV: experiment and theory journal, June 2017

An investigation of the structure near the L 2,3 edges of argon, the M 4,5 edges of krypton and the N 4,5 edges of xenon, using electron impact with high resolution journal, August 1977

High-resolution study of 1 P o double-excitation states in helium journal, March 1996

New Absorption Spectra of Atomic and Molecular Oxygen in the Vacuum Ultraviolet. II. Rydberg Series from O I( 1 D 2 ) and O I( 1 S 0 ) Metastable States journal, December 1967

New Absorption Spectra of Atomic and Molecular Oxygen in the Vacuum Ultraviolet. I. Rydberg Series from O I Ground State and New Excited O 2 Bands journal, March 1967

RMATRX1: Belfast atomic R-matrix codes
dataset, January 2019

Photoionized plasmas induced in neon with extreme ultraviolet and soft X-ray pulses produced using low and high energy laser systems
journal, April 2015

A higher-than-predicted measurement of iron opacity at solar interior temperatures
journal, December 2014

Phosphorus in the Young Supernova Remnant Cassiopeia A
journal, December 2013

PHOTOIONIZATION MODELS FOR THE SEMI-FORBIDDEN C iii] 1909 EMISSION IN STAR-FORMING GALAXIES
journal, December 2016

Doubly-charged ions in the planetary ionospheres: a review
journal, January 2011

Photoionisation of ions with synchrotron radiation: from ions in space to atoms in cages
journal, November 2015

Photoionization of atomic ions
journal, September 2001

Close-coupling calculations for photoionisation cross sections of neon ions: Ne II, Ne III and Ne IV
journal, October 1979

Photoionization of ${Ne}^{+}$ using synchrotron radiation
journal, December 2002

Photoionization of ions of the nitrogen isoelectronic sequence: experiment and theory for F ²⁺ and Ne ³⁺
journal, February 2005

Photoionization of singly and doubly charged neon ions following inner-shell excitation
journal, December 2001

Photoionization of Ne Atoms and Ne ⁺ Ions Near the K Edge: PrecisionSpectroscopy and Absolute Cross-sections
journal, February 2017

Photoionization of Be-like N ^{3 +} and Ne ^{6 +} ions: features of Be isoelectronic sequences of Z ⩽ 10
journal, August 2012

Total photoionization cross sections of atomic oxygen from threshold to 44.3 A ̊
journal, December 1988

Photoionization cross sections and oscillator strengths for oxygen ions: O I-O VII
journal, November 1998

Autoionization and photoionization of $O (^{1} D)$
journal, October 2000

E1, E2 and M1 transition parameters for some levels over ionization limit of Ne III
journal, July 2016

Atomic data for opacity calculations. I. General description
journal, December 1987

Atomic data for opacity calculations. II. Computational methods
journal, December 1987

RMATRX1: Belfast atomic R-matrix codes
journal, December 1995

Unified treatment of electron-ion recombination in the close-coupling approximation
journal, March 1994

Close-coupling R -matrix calculations for electron-ion recombination cross sections
journal, January 1999

Techniques for the calculation of atomic structures and radiative data including relativistic corrections
journal, November 1974

Atomic data from the Iron Project: LIII. Relativistic allowed and forbidden transition probabilities for Fe xvii
journal, September 2003

Single-photon single ionization of W ⁺ ions: experiment and theory
journal, December 2015

Single photoionization of the Zn ii ion in the photon energy range 17.5–90.0 eV: experiment and theory
journal, June 2017

An investigation of the structure near the L _2,3 edges of argon, the M _4,5 edges of krypton and the N _4,5 edges of xenon, using electron impact with high resolution
journal, August 1977

High-resolution study of ${}^{1}$ $P^{o}$ double-excitation states in helium
journal, March 1996

New Absorption Spectra of Atomic and Molecular Oxygen in the Vacuum Ultraviolet. II. Rydberg Series from O I( ¹ D ₂ ) and O I( ¹ S ₀ ) Metastable States
journal, December 1967

New Absorption Spectra of Atomic and Molecular Oxygen in the Vacuum Ultraviolet. I. Rydberg Series from O I Ground State and New Excited O ₂ Bands
journal, March 1967