Dielectronic recombination and resonant transfer excitation processes for helium-like krypton

doi:10.1088/1674-1056/21/10/103401

中国物理B ›› 2012, Vol. 21 ›› Issue (10): 103401-103401.doi: 10.1088/1674-1056/21/10/103401

• ATOMIC AND MOLECULAR PHYSICS • 上一篇下一篇

Dielectronic recombination and resonant transfer excitation processes for helium-like krypton

胡骁骊^a, 屈一至^a, 张松斌^b, 张宇^c

a College of Material Sciences and Optoelectronic Technology, Graduate University of the Chinese Academy of Sciences, P O Box 4588, Beijing 100049, China;
b Department of Chemistry, Texas A & M University, College Station, TX 77842, USA;
c The Key Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, P O Box 8009, Beijing 100088, China

收稿日期:2012-03-09 修回日期:2012-04-12 出版日期:2012-09-01 发布日期:2012-09-01
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 1179041, 11025417, and 10979007) and the NSAF (Grant No. 10876043).

Dielectronic recombination and resonant transfer excitation processes for helium-like krypton

Hu Xiao-Li (胡骁骊)^a, Qu Yi-Zhi (屈一至)^a, Zhang Song-Bin (张松斌)^b, Zhang Yu (张宇)^c

a College of Material Sciences and Optoelectronic Technology, Graduate University of the Chinese Academy of Sciences, P O Box 4588, Beijing 100049, China;
b Department of Chemistry, Texas A & M University, College Station, TX 77842, USA;
c The Key Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, P O Box 8009, Beijing 100088, China

Received:2012-03-09 Revised:2012-04-12 Online:2012-09-01 Published:2012-09-01
Contact: Qu Yi-Zhi E-mail:yzqu@gucas.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 1179041, 11025417, and 10979007) and the NSAF (Grant No. 10876043).

摘要/Abstract

摘要： The relativistic configuration interaction method is employed to calculate the dielectronic recombination (DR) cross sections of helium-like krypton via the 1s2lnl' (n=2,3,...,15) resonances. Then, the resonant transfer excitation (RTE) processes of Kr³⁴⁺ colliding with H, He, H₂, and CH_x (x=0-4) targets are investigated under the impulse approximation. The needed Compton profiles of targets are obtained from the Hartree-Fock wave functions. The RTE cross sections are strongly dependent on DR resonant energies and strengths, and the electron momentum distributions of the target. For H₂ and H targets, the ratio of their RTE cross sections changes from 1.85 for the 1s2l2l' to 1.88 for other resonances, which demonstrates the weak molecular effects on the Compton profiles of H₂. For CH_x (x=0-4) targets, the main contribution to the RTE cross section comes from the carbon atom since carbon carries 6 electrons; as the number of hydrogen increases in CH_x, the RTE cross section almost increases by the same value, displaying the strong separate atom character for the hydrogen. However, further comparison of the individual orbital contributions of C(2p, 2s, 1s) and CH₄(1t₂, 2a₁, 1a₁) to the RTE cross sections shows that the molecular effects induce differences of about 25.1%, 19.9%, and 0.2% between 2p-1t₂, 2s-2a₁, and 1s-1a₁ orbitals, respectively.

关键词: dielectronic recombination, Compton profile, resonant transfer excitation

Abstract: The relativistic configuration interaction method is employed to calculate the dielectronic recombination (DR) cross sections of helium-like krypton via the 1s2lnl' (n=2,3,...,15) resonances. Then, the resonant transfer excitation (RTE) processes of Kr³⁴⁺ colliding with H, He, H₂, and CH_x (x=0-4) targets are investigated under the impulse approximation. The needed Compton profiles of targets are obtained from the Hartree-Fock wave functions. The RTE cross sections are strongly dependent on DR resonant energies and strengths, and the electron momentum distributions of the target. For H₂ and H targets, the ratio of their RTE cross sections changes from 1.85 for the 1s2l2l' to 1.88 for other resonances, which demonstrates the weak molecular effects on the Compton profiles of H₂. For CH_x (x=0-4) targets, the main contribution to the RTE cross section comes from the carbon atom since carbon carries 6 electrons; as the number of hydrogen increases in CH_x, the RTE cross section almost increases by the same value, displaying the strong separate atom character for the hydrogen. However, further comparison of the individual orbital contributions of C(2p, 2s, 1s) and CH₄(1t₂, 2a₁, 1a₁) to the RTE cross sections shows that the molecular effects induce differences of about 25.1%, 19.9%, and 0.2% between 2p-1t₂, 2s-2a₁, and 1s-1a₁ orbitals, respectively.

Key words: dielectronic recombination, Compton profile, resonant transfer excitation

中图分类号: (Electronic excitation and ionization of atoms (including beam-foil excitation and ionization))

34.50.Fa

34.80.Dp (Atomic excitation and ionization)

胡骁骊, 屈一至, 张松斌, 张宇. Dielectronic recombination and resonant transfer excitation processes for helium-like krypton[J]. 中国物理B, 2012, 21(10): 103401-103401.

Hu Xiao-Li (胡骁骊), Qu Yi-Zhi (屈一至), Zhang Song-Bin (张松斌), Zhang Yu (张宇). Dielectronic recombination and resonant transfer excitation processes for helium-like krypton[J]. Chin. Phys. B, 2012, 21(10): 103401-103401.

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Dielectronic recombination and resonant transfer excitation processes for helium-like krypton

Dielectronic recombination and resonant transfer excitation processes for helium-like krypton

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