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High-resolution Absorption Spectra of Acetylene in 142.8-152.3 nm
Ya-hua Hu,Chen Zhen,Jing-hua Dai,Xiao-guo Zhou*,Shi-lin Liu
Author NameAffiliationE-mail
Ya-hua Hu Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
Chen Zhen Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
Jing-hua Dai Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
Xiao-guo Zhou* Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China xzhou@ustc.edu.cn 
Shi-lin Liu Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China  
Abstract:
The absorption spectra of acetylene molecules was measured under jet-cooled conditions in the wavelength range of 142.8-152.3 nm,with a tunable and highly resolved vacuum ultraviolet (VUV) laser generated by two-photon resonant four wave difference frequency mixing processes. Due to the sufficient vibrational and rotational cooling effect of the molecular beam and the higher resolution VUV laser, the observed absorption spectra exhibit more distinct spectral features than the previous works measured at room temperature. The major three vibrational bands are assigned as a C{C symmetry stretching vibrational progress (v2=0-2) of the C1Ⅱu state of acetylene.The observed shoulder peak at 148.2 nm is assigned to the first overtone band of the trans-bending mode v4 of the C1Ⅱu state of acetylene. Additionally,the two components, 420 (μ1Ⅱu) and 420(к1Ⅱu),are suggested to exhibit in the present absorption spectra,due to their Renner-Teller effect and transition selection rule.All band origins and bandwidths are obtained subsequently,and it is foundthat bandwidths are broadened and lifetimes decrease gradually with the excitation of vibration.
Key words:  Acetylene, Vacuum ultraviolet, Absorption spectrum
FundProject:
High-resolution Absorption Spectra of Acetylene in 142.8-152.3 nm
胡亚华,甄承,戴静华,周晓国*,刘世林
摘要:
利用双光子共振四波混频差频技术产生高分辨、可调谐的真空紫外(VUV)激光,在142.8-152.3nm波长范围内测量了超声射流冷却乙炔分子的吸收光谱. 由于射流冷却的效果和VUV激光高分辨的特性,当前的吸收光谱显示出较以往实验光谱更清晰的光谱振动峰结构,其中主要的三个振动谱峰序列对应了乙炔分子C1Ⅱu态的C-C对称伸缩振动激发(v2=0-2). 此外,148.2 nm处的肩峰则被归属为反对称弯曲振动v4的第一泛频激发,同时由于Renner-Teller效应分裂和跃迁选律的限制,当前的吸收光谱中观测到420(μ1Ⅱu)和420(к1Ⅱu)两个组分. 由此获得了各振动子带的带源位置和半高峰宽. 随着振动的激发,各振动峰逐渐加宽,能级寿命减小.
关键词:  乙炔,真空紫外,吸收光谱
DOI:10.1088/1674-0068/21/05/415-420
分类号: