文献类型：期刊文献

英文题名：TIME-RESOLVED GAS ELECTRON-DIFFRACTION STUDY OF THE 193-NM PHOTOLYSIS OF 1,2-DICHLOROETHENES

作者：EWBANK, JD; LUO, JY; ENGLISH, JT; LIU, RF; FAUST, WL; SCHAFER, L

机构：[1]UNIV ARKANSAS,DEPT CHEM,FAYETTEVILLE,AR 72701;[2]E CHINA UNIV CHEM TECHNOL,CHEM PHYS LAB,SHANGHAI 200237,PEOPLES R CHINA;[3]NAVAL RES LAB,WASHINGTON,DC 20357

年份：1993

卷号：97

期号：34

起止页码：8745

外文期刊名：JOURNAL OF PHYSICAL CHEMISTRY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:A1993LX14600016)】；

语种：英文

摘要：We have employed time-resolved gas electron diffraction. using an excite-and-probe technique developed on the basis of various precedents,1-2 for study of the 193-nm photodissociation of isomeric 1,2-dichloroethenes. The procedure3 involves a pulsed electron beam synchronous with photoexcitation and on-line electron diffraction intensity recording with a photodiode array. When the time delay between excitation and diagnostic electron scattering is 15 ns, only fragmentation and no cis-trans somerization is observed. When the time delay is several milliseconds, cis-trans isomerization is prevalent. This finding confirms the thesis that, because of faster intervening dissociative processes, cis-trans isomerization is not a primary photochemically driven unimolecular rearrangement of 193-nm irradiated dichloroethenes but hinges upon intermolecular collisions.