中国物理B ›› 2003, Vol. 12 ›› Issue (12): 1390-1394.doi: 10.1088/1009-1963/12/12/010

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Near threshold photodetachment cross section of negative atomic oxygen ions

吴建华1, 袁建民1, Vo Ky Lan2   

  1. (1)Department of Applied Physics, National University of Defense Technology, Changsha 410073, China; (2)Observatoire de Paris, Meudon, 92195 Meudon, France
  • 收稿日期:2003-05-03 修回日期:2003-06-30 出版日期:2003-12-16 发布日期:2005-03-16
  • 基金资助:
    Project supported by the National Science Fund for Distinguished Young Scholars (Grant No 10025416), the National Natural Science Foundation of China (Grant No 19974075), the National High-Tech ICF Committee in China, and China Research Association of Atomic and Molecular Data.

Near threshold photodetachment cross section of negative atomic oxygen ions

Wu Jian-Hua (吴建华)a, Yuan Jian-Min (袁建民)a, Vo Ky Lanb   

  1. a Department of Applied Physics, National University of Defense Technology, Changsha 410073, China; b Observatoire de Paris, Meudon, 92195 Meudon, France
  • Received:2003-05-03 Revised:2003-06-30 Online:2003-12-16 Published:2005-03-16
  • Supported by:
    Project supported by the National Science Fund for Distinguished Young Scholars (Grant No 10025416), the National Natural Science Foundation of China (Grant No 19974075), the National High-Tech ICF Committee in China, and China Research Association of Atomic and Molecular Data.

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摘要： A 40-target state close-coupling calculation for the photodetachment cross section of negative atomic oxygen near threshold is carried out with core－valence electron correlation by using the R-matrix method. It was shown that after considering the excitations of two electrons from the 2s shell, the electron affinity of O^- (2s^22p^5{}^2P°) agrees with the experimental result much better than that just considering the excitations of electrons only from the 2p shell as well as only one electron from the 2s shell. Total cross section as well as the main contribution of the ionization channels to the partial cross section are illustrated to show the structure near threshold clearly.

Abstract: A 40-target state close-coupling calculation for the photodetachment cross section of negative atomic oxygen near threshold is carried out with core－valence electron correlation by using the R-matrix method. It was shown that after considering the excitations of two electrons from the 2s shell, the electron affinity of O$^-$ (2s$^2$2p$^5$ $^2$P°) agrees with the experimental result much better than that just considering the excitations of electrons only from the 2p shell as well as only one electron from the 2s shell. Total cross section as well as the main contribution of the ionization channels to the partial cross section are illustrated to show the structure near threshold clearly.

Key words: electron correlation, photodetachment, electron affinities

中图分类号:  (Photodetachment of atomic negative ions)

  • 32.80.Gc
32.80.Fb (Photoionization of atoms and ions) 32.10.Hq (Ionization potentials, electron affinities)