文献类型：期刊文献

英文题名：INSTRUMENTATION FOR GAS ELECTRON-DIFFRACTION EMPLOYING A PULSED ELECTRON-BEAM SYNCHRONOUS WITH PHOTOEXCITATION

作者：EWBANK, JD; FAUST, WL; LUO, JY; ENGLISH, JT; MONTS, DL; PAUL, DW; DOU, Q; SCHAFER, L

机构：[1]USN,RES LAB,WASHINGTON,DC 20375;[2]E CHINA UNIV CHEM TECHNOL,CHEM PHYS LAB,SHANGHAI 200237,PEOPLES R CHINA;[3]MISSISSIPPI STATE UNIV,DEPT PHYS & ASTRON,MISSISSIPPI STATE,MS 39762

年份：1992

卷号：63

期号：6

起止页码：3352

外文期刊名：REVIEW OF SCIENTIFIC INSTRUMENTS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:A1992HX69200020)】；

语种：英文

摘要：A novel instrument is described capable of recording gas electron diffraction (GED) patterns of excited molecular states or transient species with pulsed electron beams. The system incorporates (1) a pulsed optical beam for electronic excitation of materials under study, (2) a synchronously pulsed source of 30-50 keV electrons in a space-charge-limited beam, (3) necessary vacuum environment and sample-handling capabilities, and (4) detection and signal processing equipment using an on-line procedure developed at the University of Arkansas. Data obtained for several test gases demonstrate successful operation of the instrument. The 193 nm laser photofragmentation of carbon disulfide, CS2, is described in detail. In agreement with a recent time-of-flight mass spectrometric study of the same process, carbon monosulfide was observed as the reaction product. This study is the first quantitatively successful joint exercise of on-line multichannel GED data recording and a stroboscopic electron source. The method is expected to be generally useful in determining the structures of excited molecular states or reactive species, and it may enable studies of time-dependent phenomena. The current time resolution is approximately 20 ns.