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281—332nm SO+2的光碎片激发谱研究

王 仲 张立敏 王 峰 李 江 俞书勤

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281—332nm SO+2的光碎片激发谱研究

王 仲, 张立敏, 王 峰, 李 江, 俞书勤

Study on the photofragment excitation spectrum of SO+2 in the range of 281-332nm

Wang Zhong, Zhang Li-Min, Wang Feng, Li Jiang, Yu Shu-Qin
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  • 在超声分子束条件下,利用380.85nm的电离激光使SO2分子经由[3+1]共 振增强多光 子电离(REMPI)制备纯净的分子离子SO+2(2A 1(000)),用另一束解离激光在281 —332nm扫描获得了光解碎片激发(PHOFEX)谱.获得的光碎片SO+激发谱基本可以 归属为SO +2(,)←SO+
    With the preparing of SO+2(2A1( 000)) by [3+1] multiphoton ioniz ation of the neutral SO2 molecules at 380.85nm,the photofragment exci tation (P HOFEX) spectrum in ultraviolet (UV) (281-332nm) wavelength range has been obtain ed.The PHOFEX spectrum in the UV range was assigned essentially to the SO+2(,)←SO+2(2A1) transitions.The transitions fr om 2A1(000) to the bend vibration levels of SO+2() were suggested,new harmon ic bend vibrational frequency ν2=241.78±0.92cm-1 and the anharmonicity constant X22=-1.71±0.01cm-1 for SO+2() was deduced.By using th e SO+ PHOFEX spectra in UV and in visible range (562-664nm), the symm etry of ,, states of SO+2 and the predissociation mechanism of SO+2(,,) were determined,that is,(i)the symmetry of ,, states of SO+2 s hould be 2 B2,2B1,2A1,( ii) around ,, states there should be two r epulsive states of symmetry α2A2 and β2B2,converging to the dissociation limit of SO+(X2П)+O(3Pg),(iii)the couplings betw een 2B1 and α2A2 and betwee n 2 B2 and β2Β2,lead to the dissociation to S O+(X2П)+O(3Pg).
    • 基金项目: 国家自然科学基金(批准号:20173053)资助的课题.
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  • 文章访问数:  6875
  • PDF下载量:  672
  • 被引次数: 0
出版历程
  • 收稿日期:  2003-02-19
  • 修回日期:  2003-06-09
  • 刊出日期:  2003-06-05

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