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Dissociation Dynamics of Nitrous Oxide from Jet-cooling Absorption Spectrum in 142.5-147.5 nm
Cheng Zhen1, Ya-hua Hu2, Xiao-guo Zhou*1, Shi-lin Liu1
1.Hefei National Laboratory for Physical Sciences at Microscale, Department of Chemical Physics, University of Science and Technology of China, Hefei 230026, China;2.College of Mathematics, Physics and Information Engineering, Jiaxing University, Jiaxing 314001, China
Abstract:
The absorption spectrum of the C1∏ state of N2O molecule in the wavelength range of 142.5~147.5 nm has been measured under the jet-cooled condition, and the clear spectral features are displayed. A vibrational progression is observed with a frequency interval of about 500 cm-1. With the aid of potential energy surfaces (PES) of the low-lying electronic states of N2O, the vibrational progression is assigned as the bending mode of the repulsive C1∏ state. From the Fourier transformation analysis, the recurrence period of the peri-odic orbit near the transition state region is derived to be 65 fs. Through the least-square Lorentzian fitting, the lifetimes of the resonance levels are estimated from their profile widths to be about 20 fs, which is shorter than the recurrence period. Therefore, a new explanation is suggested for the observed diffuse spectral structure, based on the behavior of dissociating N2O on PES of the C1∏ state in the present excitation energy range.
Key words:  Dissociation dynamic, Nitrous oxide, Jet-cooling, Absorption spectrum
FundProject:
N2O在142.5-147.5 nm射流冷却吸收光谱揭示的解离动力学
甄承1, 胡亚华2, 周晓国*1, 刘世林1
1.中国科学技术大学合肥微尺度物质科学国家实验室,化学物理系,合肥230026;2.嘉兴大学数学物理和信息工程学院,嘉兴314001
摘要:
在射流冷却分子束下, 测量了142.5~147.5 nm N2O分子C1∏态的吸收光谱,观测到清晰的振动序列结构,振动频率间隔约为500 cm-1. 结合理论计算的电子态势能面结构,这个振动序列被标识为解离电子态C1∏的弯曲振动激发. 傅立叶变换得到了相应的轨道周期为65 fs,而通过Lorentzian线型拟合获得了各振动峰对应的能级寿命约为20 fs.
关键词:  吸收光谱,解离动力学,傅立叶变换,一氧化二氮
DOI:10.1088/1674-0068/24/03/267-274
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