中国物理B ›› 2013, Vol. 22 ›› Issue (2): 23404-023404.doi: 10.1088/1674-1056/22/2/023404

• ATOMIC AND MOLECULAR PHYSICS • 上一篇    下一篇

Momentum transfer dependence behaviors of ionization and dissociation of oxygen

林梅a, 刘亚伟a, 钟志萍b, 朱林繁a   

  1. a Hefei National Laboratory for Physical Sciences at Microscale, Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China;
    b School of Physical Sciences, University of the Chinese Academy of Sciences, P. O. Box 4588, Beijing 100049, China
  • 收稿日期:2012-06-10 修回日期:2012-07-23 出版日期:2013-01-01 发布日期:2013-01-01
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grants Nos. 10734040, 11274291, 10979040, and 11074299); the National Basic Research Program of China (Grant No. 2010CB923301); the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20103402110027); and the Fundamental Research Funds for the Central Universities, China.

Momentum transfer dependence behaviors of ionization and dissociation of oxygen

Lin Mei (林梅)a, Liu Ya-Wei (刘亚伟)a, Zhong Zhi-Ping (钟志萍)b, Zhu Lin-Fan (朱林繁)a   

  1. a Hefei National Laboratory for Physical Sciences at Microscale, Department of Modern Physics, University of Science and Technology of China, Hefei 230026, China;
    b School of Physical Sciences, University of the Chinese Academy of Sciences, P. O. Box 4588, Beijing 100049, China
  • Received:2012-06-10 Revised:2012-07-23 Online:2013-01-01 Published:2013-01-01
  • Contact: Zhu Lin-Fan E-mail:lfzhu@ustc.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grants Nos. 10734040, 11274291, 10979040, and 11074299); the National Basic Research Program of China (Grant No. 2010CB923301); the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20103402110027); and the Fundamental Research Funds for the Central Universities, China.

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摘要： The decay pathways of structured ionization region of oxygen at different momentum transfers, i.e., 0, 0.23 a.u. (atomic unit), and 0.91 a.u., are studied by measuring the ion and the scattered electron coincidently. It is found that the dipole-forbidden superexcited states of (2σu)-1(c4Σu-)npσu 3Σg-≤←X3Σg- decay into different channels according to the principal quantum number n. The broad ridge above 35 eV, which may be due to inner-valence excited states of (2σg)-1nλ or multiply excited states, is observed both at small and large momentum transfers, and its decay channel of O++O is dominant.

关键词: oxygen, superexcited states, ionization continuum, decay channel

Abstract: The decay pathways of structured ionization region of oxygen at different momentum transfers, i.e., 0, 0.23 a.u. (atomic unit), and 0.91 a.u., are studied by measuring the ion and the scattered electron coincidently. It is found that the dipole-forbidden superexcited states of (2σu)-1(c4Σu-)npσu 3Σg-≤←X3Σg- decay into different channels according to the principal quantum number n. The broad ridge above 35 eV, which may be due to inner-valence excited states of (2σg)-1nλ or multiply excited states, is observed both at small and large momentum transfers, and its decay channel of O++O is dominant.

Key words: oxygen, superexcited states, ionization continuum, decay channel

中图分类号:  (Molecular excitation and ionization)

  • 34.80.Gs
33.80.Eh (Autoionization, photoionization, and photodetachment) 32.70.Cs (Oscillator strengths, lifetimes, transition moments) 33.20.Ni (Vacuum ultraviolet spectra)