title: VUV Photodissociation Dynamics of Nitrous Oxide: The O((1)SJ=0) and O((3)PJ=2,1,0) Product Channels.
abstract: Vacuum ultraviolet photodissociation dynamics of nitrous oxide was investigated using the time-sliced velocity ion imaging technique. Images of the O((1)SJ=0) and the O((3)PJ=2,1,0) products were measured at nine photolysis wavelengths from 124.44 to 133.20 nm, respectively. Three main dissociation channels: O((1)S0) + N2(X(1)Σg(+)), O((3)PJ=2,1,0) + N2(A(3)Σu(+)), and O((3)PJ=2,1,0) + N2(B(3)Πg) were observed and identified in the product images where vibrational states of N2 were fully resolved. Product total kinetic energy releases and angular distributions were acquired. In all product channels, the branching ratios of vibrational states of N2 products were determined. In addition, the O((3)PJ=2,1,0) + N2(A(3)Σu(+))/O((3)PJ=2,1,0) + N2(B(3)Πg) branching ratios were determined. We found that in the O((3)PJ=2,1,0) channels the O((3)PJ=2,1,0) + N2(B(3)Πg) channel becomes dominant at long photolysis wavelength, indicating a strong coupling between the singlet D((1)Σg(+)) state and the triplet (3)Π state. For both O((1)S0) and O((3)PJ=2,1,0) products, the derived angular anisotropy parameters (β values) are very close to 2 at lower vibrational states of the correlated N2 electronic states and gradually decrease with the increasing vibrational quantum number. These behaviors suggest that the photodissociation processes are primarily governed by a fast dissociation in a linear geometry, while the N2 products at excited vibrational states are very likely produced via a more bent transition state.
authors.affiliation: †Center for Advanced Chemical Physics and Department of Chemical Physics, School of Chemistry and Materials Science, University of Science and Technology of China, Jinzhai Road 96, Hefei 230026, Anhui Province, P. R. China.
authors.forename: Shengrui
authors.initials: S
authors.lastname: Yu
authors.affiliation: †Center for Advanced Chemical Physics and Department of Chemical Physics, School of Chemistry and Materials Science, University of Science and Technology of China, Jinzhai Road 96, Hefei 230026, Anhui Province, P. R. China.
authors.forename: Daofu
authors.initials: D
authors.lastname: Yuan
authors.affiliation: †Center for Advanced Chemical Physics and Department of Chemical Physics, School of Chemistry and Materials Science, University of Science and Technology of China, Jinzhai Road 96, Hefei 230026, Anhui Province, P. R. China.
authors.forename: Wentao
authors.initials: W
authors.lastname: Chen
authors.affiliation: †Center for Advanced Chemical Physics and Department of Chemical Physics, School of Chemistry and Materials Science, University of Science and Technology of China, Jinzhai Road 96, Hefei 230026, Anhui Province, P. R. China.|‡State Key Laboratory of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian 116023, Liaoning Province, P. R. China.
authors.forename: Xueming
authors.initials: X
authors.lastname: Yang
authors.affiliation: †Center for Advanced Chemical Physics and Department of Chemical Physics, School of Chemistry and Materials Science, University of Science and Technology of China, Jinzhai Road 96, Hefei 230026, Anhui Province, P. R. China.|§iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), University of Science and Techonology of China, Jinzhai Road 96, Hefei 230026, Anhui Province, P. R. China.
authors.forename: Xingan
authors.initials: X
authors.lastname: Wang