Lifetime determination of the Fe XIV 3s{sup 2}3p {sup 2}P{sub 3} at {sub {approx}}{sub sol{approx}} at {sub 2}{sup o} metastable level

doi:10.1103/PHYSREVA.75.032504

Title: Lifetime determination of the Fe XIV 3s{sup 2}3p {sup 2}P{sub 3} at {sub {approx}}{sub sol{approx}} at {sub 2}{sup o} metastable level

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Abstract

The lifetime of the 3s{sup 2}3p {sup 2}P{sub 3} at {sub {approx}}{sub sol{approx}} at {sub 2}{sup o} first excited energy level of Fe XIV (Al like) was measured at the Heidelberg electron beam ion trap by monitoring its optical decay to the ground state by a magnetic dipole (M1) forbidden transition at {lambda}=530.29 nm (green coronal line), a well-known line in stellar spectra. A new trapping scheme has been applied. Possible systematic effects were investigated by studying the dependence of the decay curves on various trapping conditions with high statistical significance. The result of 16.726{sub -0.010}{sup +0.020} ms shows an unexplained discrepancy in the average value of existing theoretical predictions. The inclusion of the electron anomalous magnetic moment within the theoretical calculations increases this disagreement, thus pointing at other possible origins of this discrepancy.

Authors:

Brenner, G.; Lopez-Urrutia, J. R. Crespo; Harman, Z.; Mokler, P. H.; Ullrich, J. ^[1]

Max-Planck Institut fuer Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg (Germany)

Publication Date:: Thu Mar 15 00:00:00 EDT 2007

OSTI Identifier:: 20982301

Resource Type:: Journal Article

Resource Relation:: Journal Name: Physical Review. A; Journal Volume: 75; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevA.75.032504; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)

Country of Publication:: United States

Language:: English

Subject:: 74 ATOMIC AND MOLECULAR PHYSICS; CATIONS; DECAY; ELECTRON BEAMS; ELECTRONIC STRUCTURE; ELECTRONS; FORBIDDEN TRANSITIONS; FORECASTING; GROUND STATES; IRON; LIFETIME; MAGNETIC DIPOLES; MAGNETIC MOMENTS; METASTABLE STATES; TRAPPING; TRAPS

Citation Formats


                    Brenner, G., Lopez-Urrutia, J. R. Crespo, Harman, Z., Mokler, P. H., and Ullrich, J.. Lifetime determination of the Fe XIV 3s{sup 2}3p {sup 2}P{sub 3} at {sub {approx}}{sub sol{approx}} at {sub 2}{sup o} metastable level.  United States: N. p., 2007. 
        Web.  doi:10.1103/PHYSREVA.75.032504.

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                    Brenner, G., Lopez-Urrutia, J. R. Crespo, Harman, Z., Mokler, P. H., & Ullrich, J.. Lifetime determination of the Fe XIV 3s{sup 2}3p {sup 2}P{sub 3} at {sub {approx}}{sub sol{approx}} at {sub 2}{sup o} metastable level.  United States.  doi:10.1103/PHYSREVA.75.032504.

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                    Brenner, G., Lopez-Urrutia, J. R. Crespo, Harman, Z., Mokler, P. H., and Ullrich, J.. Thu .  
        "Lifetime determination of the Fe XIV 3s{sup 2}3p {sup 2}P{sub 3} at {sub {approx}}{sub sol{approx}} at {sub 2}{sup o} metastable level".  United States.  
        doi:10.1103/PHYSREVA.75.032504.

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@article{osti_20982301,

  title        = {Lifetime determination of the Fe XIV 3s{sup 2}3p {sup 2}P{sub 3} at {sub {approx}}{sub sol{approx}} at {sub 2}{sup o} metastable level},

  author       = {Brenner, G. and Lopez-Urrutia, J. R. Crespo and Harman, Z. and Mokler, P. H. and Ullrich, J.},

  abstractNote = {The lifetime of the 3s{sup 2}3p {sup 2}P{sub 3} at {sub {approx}}{sub sol{approx}} at {sub 2}{sup o} first excited energy level of Fe XIV (Al like) was measured at the Heidelberg electron beam ion trap by monitoring its optical decay to the ground state by a magnetic dipole (M1) forbidden transition at {lambda}=530.29 nm (green coronal line), a well-known line in stellar spectra. A new trapping scheme has been applied. Possible systematic effects were investigated by studying the dependence of the decay curves on various trapping conditions with high statistical significance. The result of 16.726{sub -0.010}{sup +0.020} ms shows an unexplained discrepancy in the average value of existing theoretical predictions. The inclusion of the electron anomalous magnetic moment within the theoretical calculations increases this disagreement, thus pointing at other possible origins of this discrepancy.},

  doi          = {10.1103/PHYSREVA.75.032504},

  journal      = {Physical Review. A},

  number       = 3,

  volume       = 75,

  place        = {United States},

  year         = {Thu Mar 15 00:00:00 EDT 2007},

  month        = {Thu Mar 15 00:00:00 EDT 2007}

}

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DOI: 10.1103/PHYSREVA.75.032504

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Measurement and calculation of absolute cross sections for excitation of the 3s{sup 2}3p {sup 2}P{sub 1} at {sub {approx}}{sub sol{approx}} at {sub 2}{sup o}-3s{sup 2}3p {sup 2}P{sub 3} at {sub {approx}} {sub sol{approx}} at {sub 2}{sup o} fine-structure transition in Fe{sup 13+}

Hossain, S. ; Smith, S. J. ; Chutjian, A. ; ... - Physical Review. A

Experimental cross sections are reported for the Fe{sup 13+} coronal green line transition 3s{sup 2}3p {sup 2}P{sub 1} at {sub {approx}}{sub sol{approx}} at {sub 2}{sup o}-3s{sup 2}3p {sup 2}P{sub 3} at {sub {approx}}{sub sol{approx}} at {sub 2}{sup o} at {lambda}5303 A ring (2.338 eV). The center-of-mass interaction energies are in the range 1.7 eV (below threshold) through threshold, to 6.6 eV (2.9xthreshold). Data are compared with results of a 135-level Breit-Pauli R-matrix theory. Present experiment detects a strong maximum in the excitation cross section of magnitude 15x10{sup -16} cm{sup 2} at 2.6 eV. Smaller structures are observed between 3 eVmore »« less
DOI: 10.1103/PHYSREVA.75.022709
Lifetime measurement of the Ar XIV 1s{sup 2}2s{sup 2}2p {sup 2}P{sub 3/2}{sup o} metastable level at the Heidelberg electron-beam ion trap

Lapierre, A. ; Crespo Lopez-Urrutia, J. R. ; Braun, J. ; ... - Physical Review. A

We present the details of an accurate lifetime measurement of the 1s{sup 2}2s{sup 2}2p {sup 2}P{sub 3/2}{sup o} metastable level in boronlike Ar XIV performed at the Heidelberg electron beam ion trap [A. Lapierre et al., Phys. Rev. Lett. 95, 183001 (2005)]. The lifetime was inferred from decay curves resulting from deexcitation of the metastable level to its {sup 2}P{sub 1/2}{sup o} ground state through a magnetic-dipole (M1) transition upon cyclically turning on and off the electron beam. The measured lifetime of 9.573(4)((+12/-5)) ms (stat)(syst) is in disagreement with a trend of theoretical predictions of 9.53(1) ms, which include themore »« less
DOI: 10.1103/PHYSREVA.73.0
Electron excitation cross sections for the SII transitions 3s{sup 2}3p{sup 3}{sup 4}S{sup o}{r_arrow}3s{sup 2}3p{sup 3}{sup 2}D{sup o}, {sup 2}P{sup o}, and 3s3p{sup 4}{sup 4}P

Liao, C. ; Smith, S.J. ; Hitz, D. ; ... - Astrophysical Journal

Experimental and theoretical collisional excitation cross sections are reported for the transitions 3s{sup 2}3p{sup 3}{sup 4}S{sup o}{r_arrow}3s{sup 2}3p{sup 3}{sup 2}D{sup o}, {sup 2}P{sup o}, and 3s 3p{sup 4}{sup 4}P in SII. The transition wavelengths (energies) are 6716 {Angstrom} (1.85 eV), 4069 {Angstrom} (3.05 eV), and 1256 {Angstrom} (9.87 eV), respectively. In the experiments, use is made of the energy-loss merged-beams method. The metastable fraction of the SII beam was assessed and minimized. The contribution of elastically scattered electrons was reduced by the use of a lowered solenoidal magnetic field and a modulated radio-frequency voltage on the analyzing plates and bymore »« less
DOI: 10.1086/304375
Laser-probing measurements and calculations of lifetimes of the 5d {sup 2}D{sub 3} at {sub {approx}}{sub sol{approx}} at {sub 2} and 5d {sup 2}D{sub 5} at {sub {approx}}{sub sol{approx}} at {sub 2} metastable levels in Ba II

Gurell, J. ; Lundin, P. ; Mannervik, S. ; ... - Physical Review. A

The two metastable levels 5d {sup 2}D{sub 3} at {sub {approx}}{sub sol{approx}} at {sub 2} and 5d {sup 2}D{sub 5} at {sub {approx}}{sub sol{approx}} at {sub 2} in Ba II both show extremely long lifetimes of the order of several tens of seconds each. This has been found both by experiments and by theoretical predictions. The small transition probabilities associated with these two levels make them interesting and challenging for theoreticians as well as for experimentalists. Several calculations and measurements of these two lifetimes have been made previously but discrepancies between the results are present. This article presents values ofmore »« less
DOI: 10.1103/PHYSREVA.75.052506
Measurement of the hyperfine structure and isotope shifts of the 3s{sup 2}3p{sup 2} {sup 3}P{sub 2}{yields}3s3p{sup 3} {sup 3}D{sub 3}{sup o} transition in silicon

Lee, S. A. ; Fairbank, W. M. Jr. - Physical Review. A

The hyperfine structure and isotope shifts of the 3s{sup 2}3p{sup 2} {sup 3}P{sub 2}{yields}3s3p{sup 3} {sup 3}D{sub 3}{sup o} transition in silicon have been measured. The transition at 221.7 nm was studied by-laser induced fluorescence in an atomic Si beam. For {sup 29}Si, the hyperfine A constant for the 3s{sup 2}3p{sup 2} {sup 3}P{sub 2} level was determined to be -160.1{+-}1.3 MHz (1{sigma} error), and the A constant for the 3s3p{sup 3} {sup 3}D{sub 3}{sup o} level is -532.9{+-}0.6 MHz. The isotope shifts (relative to the abundant isotope {sup 28}Si) of the transition were determined to be 1753.3{+-}1.1 MHz formore »« less
DOI: 10.1103/PHYSREVA.82.042515