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Chin. Phys. B, 2012, Vol. 21(10): 103401    DOI: 10.1088/1674-1056/21/10/103401
ATOMIC AND MOLECULAR PHYSICS Prev   Next  

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
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 CHx (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 CHx (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 CHx, 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.
Keywords:  dielectronic recombination      Compton profile      resonant transfer excitation  
Received:  09 March 2012      Revised:  12 April 2012      Accepted manuscript online: 
PACS:  34.50.Fa (Electronic excitation and ionization of atoms (including beam-foil excitation and ionization))  
  34.80.Dp (Atomic excitation and ionization)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 1179041, 11025417, and 10979007) and the NSAF (Grant No. 10876043).
Corresponding Authors:  Qu Yi-Zhi     E-mail:  yzqu@gucas.ac.cn

Cite this article: 

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 2012 Chin. Phys. B 21 103401

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