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High Resolution Absorption Spectrum of Jet-cooled OCS Between 64150 and 65840 cm-1
Li Qifeng ,Wang Hua,Yu Yuanqin,Liu Shilin*,Yu Shuqin,Ma Xingxiao
Author NameAffiliationE-mail
Li Qifeng Open Laboratory of Bond-selective Chemistry, Chinese Academy of Sciences, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026  
Wang Hua Open Laboratory of Bond-selective Chemistry, Chinese Academy of Sciences, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026  
Yu Yuanqin Open Laboratory of Bond-selective Chemistry, Chinese Academy of Sciences, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026  
Liu Shilin* Open Laboratory of Bond-selective Chemistry, Chinese Academy of Sciences, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026 slliu@ustc.edu.cn 
Yu Shuqin Open Laboratory of Bond-selective Chemistry, Chinese Academy of Sciences, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026  
Ma Xingxiao Open Laboratory of Bond-selective Chemistry, Chinese Academy of Sciences, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026  
Abstract:
The absorption spectrum of OCS molecules under jet-cooled conditions has been measured between 64150 and 65840 cm-1 with a highly resolved tunable vacuum ultraviolet (VUV) laser (about 0.2 cm-1), generated by two-photon resonant four wave mixing process. During the experiment, the VUV intensities prior and posterior to the OCS absorption were monitored simultaneously in order to increase the sensitivity of absorption measurement, and the absorption sensitivity △I/I was determined to be 1%. The measured spectrum is essentially similar to the S(1S) photofragment excitation spectrum under similar conditions, indicating that the dissociation to produce S(1S) fragment is the main pathway. The difference between these kinds of spectra, however, implies the existence of other dissociation channels in addition to the S(1S) pathway.
Key words:  OCS, Jet-cooled, VUV absorption spectrum
FundProject:
射流冷却的OCS分子高分辨VUV吸收光谱研究
李奇峰,汪华,喻远琴,刘世林*,俞书勤,马兴孝
摘要:
以双光子共振四波混频差频产生的高分辨、可调谐真空紫外激光(VUV)为光源,在151~156 nm内测量了超声射流冷却的OCS分子1∑+-1∑+电子跃迁带的吸收光谱.由于采用射流冷却和高分辨激光,得到与前人吸收谱测量结果不同的光谱线线形,观察到两个呈现明显非对称结构的振动峰,通过Fano线型拟合,获得了这两个振动峰的半高峰宽和非对称参数q值,与前人光碎片激发谱测量结果基本一致.实验中,为了消除VUV激光强度波动的影响,通过记录参比光的方法,有效地提高了吸收光谱的信噪比,使得吸收测量的灵敏度达到1%左右.
关键词:  OCS  真空紫外激光  吸收光谱
DOI:10.1088/1674-0068/18/4/474-478
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