Vacuum ultraviolet photodissociation dynamics of N20+hv→N2(X1Σ+g)+O(1S0)in the short wavelength tail of D1Σ+band has been in-vestigated using the time-sliced velocity-mapped ion imaging technique by probing the images of the O(1S0)photoproducts at a set of photoly-sis 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(X1Σ+g)photofrag-ments and angular anisotropy parameters have been obtained by analyzing the raw O(1S0)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 wave-length.Furthermore,the vibrational state specific anisotropy parameter β at each photolysis wavelength exhibits a drastic fluctuation near β=1.75 at v＜8,and decreases to a minimum as the vibrational quantum number further increases.While the overall anisotropy parame-ter β for the N2(X1Σ+g)+0(1S0)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 D1Σ+state to the dissociative state with bent geometry dominating to generate the additional vibrational structures at high photoexcitation energies.

Hong Liao;Zheng Li;Dao-fu Yuan;Wen-tao Chen;Xing-an Wang;Sheng-rui Yu;Xue-ming Yang

Hangzhou Institute of Advanced Studies,Zhejiang Normal University,Hangzhou 311231,China;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;State key Laboratory of Molecular Reaction Dynamics,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023,China

化学物理学报（英文版）

[1]Hong Liao;Zheng Li;Dao-fu Yuan;Wen-tao Chen;Xing-an Wang;Sheng-rui Yu;Xue-ming Yang-.Vacuum Ultraviolet Photodissociation Dynamics of N2O+hv→N2(X1Σ+g)+O(1S0)in the Short Wavelength Tail of D1Σ+Band)[J].化学物理学报（英文版）,2022(06):860-866

Photodissociation,N2O+hv,+Band,photodissociation,N20+hv,+band,photoproducts,photoly,photofrag,vibrationally,monotonical,+state

Vacuum,Ultraviolet,Dynamics,X1,+g,+O,1S0,Short,Wavelength,Tail,D1,ultraviolet,dynamics,short,tail,has,been,vestigated,using,sliced,velocity,mapped,imaging,technique,by,probing,images,set,wavelengths,including,total,kinetic,energy,release,distributions,ments,angular,anisotropy,parameters,have,obtained,analyzing,raw,It,noted,that,additional,excited,Boltzmann,like,feature,start,appear,except,statistical,component,photolysis,decreases,corresponding,populations,become,pronounced,decreasing,Furthermore,specific,each,exhibits,drastic,fluctuation,near,minimum,quantum,number,further,increases,While,overall,+0,channel,presents,roughly,from,experimental,observations,suggest,there,least,fast,nonadiabatic,pathway,initially,prepared,dissociative,bent,geometry,dominating,generate,structures,high,photoexcitation,energies

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