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PHOFEX Continuum Spectra of SO2 + in Range (563 ~660 nm)
Wang Zhong,Zhang Limin,Li Jiang,Wang Feng,Yu Yuanqin,Zhang Junlong,Yu Shuqin
Author NameAffiliationE-mail
Wang Zhong Laboratory of Bond Selective Chemistry, Chinese Academy of Sciences, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026  
Zhang Limin Laboratory of Bond Selective Chemistry, Chinese Academy of Sciences, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026 lmzha@ustc.edu.cn 
Li Jiang Laboratory of Bond Selective Chemistry, Chinese Academy of Sciences, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026  
Wang Feng Laboratory of Bond Selective Chemistry, Chinese Academy of Sciences, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026  
Yu Yuanqin Laboratory of Bond Selective Chemistry, Chinese Academy of Sciences, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026  
Zhang Junlong Laboratory of Bond Selective Chemistry, Chinese Academy of Sciences, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026  
Yu Shuqin Laboratory of Bond Selective Chemistry, Chinese Academy of Sciences, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026  
Abstract:
The photodissociation process of SO2+ molecular ions has been investigated by measuring the photofragment SO+excitation (PHOFEX) spectrum in visible (563~660 nm) wavelength range under the condition of supersonic molecular beam. The SO2+molecular ion were prepared purely by [3+1] multiphoton ionization of the neutral SO2 molecules at 380.85 nm. The SO+ PHOFEX spectrum in 563~660 nm range is continuum without any clear structure and the dissociation efficiency producing SO+ decreases with the laser wavelengths toward to red direction. These facts means that there should be a repulsive state ofα2A2around SO2+ (E, D , C). The [1+1] photodissociation mechanism of producing SO+ is suggested. Firstly, SO2+(~X2A1) ions is excited into the energy range with high dense levels of the middle state~B2B2, then SO2+(~B2B2) ions is excited into theα2A2repulsivestate by absorbing another photon, and finally dissociates to SO+(X2Π) +O(3Pg) directly .
Key words:  SO2+, Photo-dissociation, PHOFEX spectrum
FundProject:国家自然科学基金资助项目(20173053).
563~660 nm波段SO2+的PHOFEX连续谱
王仲,张立敏*,李江,王峰,喻远琴,张俊龙,俞书勤
摘要:
在超声分子束条件下,利用380.85 nm的电离激光使SO2分子经由[3+1]共振增强多光子电离(REMPI)产生纯净的SO2+(X 2A1)分子离子,用另一束解离激光在可见光波长区(563~660 nm)扫描获得了光解碎片SO+的激发(PHOFEX)谱.从563~660 nm波长区SO+的无结构连续谱以及SO2+解离的效率随波长增加而减少的实验事实,提供了SO2+(E,D,C)电子态附近存在α2A2对称性排斥态的证据,分析了产生SO+的[1+1]光解机理:(1)SO2+(X2A1)首先经由单光子激发到达B2B2中间态的密集能级区;(2)吸收另一个光子到达SO2+(E,D,C)电子态附近的α2A2排斥态,经由α2A2排斥态产生了到SO+(X2∏)+O(3Pg)的直接解离.
关键词:  SO2+  光解离  光碎片激发谱
DOI:10.1088/1674-0068/16/2/89-93
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