Vacuum Ultraviolet Photodissociation Dynamics of N_(2)O+hν→N_(2)(X^(1)Σg+)+O(^(1)S0) in the Short Wavelength Tail of D^(1)Σ+Band  

N_(2)O分子在D1∑+态短波区域的N_(2)(X^(1)∑g+)+O(^(1)S0)光解动力学研究

作　　者：Hong Liao Zheng Li Dao-fu Yuan Wen-tao Chen Xing-an Wang Sheng-rui Yua Xue-ming Yang 廖鸿;李铮;袁道福;陈文韬;王兴安;俞盛锐;杨学明(浙江师范大学杭州高等研究院,杭州311231;中国科学技术大学化学物理系,合肥230026;中国科学院大连化学物理研究所、分子反应动力学国家重点实验室,大连116023)

机构地区：[1]Hangzhou Institute of Advanced Studies,Zhejiang Normal University,Hangzhou 311231,China [2]Center for Advanced Chemical Physics and Department of Chemical Physics,School of Chemistry and Materials Science,University of Science and Technology of China,Hefei 230026,China [3]State key Laboratory of Molecular Reaction Dynamics,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China

出　　处：《Chinese Journal of Chemical Physics》2022年第6期860-866,I0072,共8页化学物理学报（英文）

基　　金：supported by the National Natural Science Foundation of China(No.21773213)。

摘　　要：Vacuum ultraviolet photodissociation dynamics of N2O+hν→N2(X^(1)Σg+)+O(^(1)S0)in the short wavelength tail of D^(1)Σ+band has been investigated using the time-sliced velocity-mapped ion imaging technique by probing the images of the O(^(1)S0)photoproducts at a set of photolysis wavelengths including 121.47 nm,122.17 nm,123.25 nm and 123.95 nm.The product total kinetic energy release distributions,vibrational state distributions of the N2(X^(1)Σg+)photofragments and angular anisotropy parameters have been obtained by analyzing the raw O(^(1)S0)images.It is noted that additional vibrationally excited photoproducts(3≤v≤8)with a Boltzmann-like feature start to appear except the non-statistical component as the photolysis wavelength decreases to 123.25 nm,and the corresponding populations become more pronounced with decreasing of the photolysis wavelength.Furthermore,the vibrational state specific anisotropy parameterβat each photolysis wavelength exhibits a drastic fluctuation nearβ=1.75 at v<8,and decreases to a minimum as the vibrational quantum number further increases.While the overall anisotropy parameterβfor the N2(X^(1)Σg+)+O(^(1)S0)channel presents a roughly monotonical increase from 1.63 at 121.47 nm to 1.95 at 123.95 nm.The experimental observations suggest that there is at least one fast nonadiabatic pathway from initially prepared D^(1)Σ+state to the dissociative state with bent geometry dominating to generate the additional vibrational structures at high photoexcitation energies.

关 键 词：PHOTODISSOCIATION Vacuum ultraviolet Ion imaging Anisotropy parameter Vibrational state distribution 

分 类 号：O643.1[理学—物理化学]