ABOUT SOME EXPERIMENTAL ASPECTS OF DOUBLE AND TRIPLE COINCIDENCE TECHNIQUES TO STUDY ELECTRON-IMPACT DOUBLE IONIZING PROCESSES

被引：38
作者：
DUPRE, C
LAHMAMBENNAI, A
DUGUET, A
机构：
[1] Lab. des Collisions Atomiques et Molecularies, Univ. Paris, XI, Orsay
来源：
MEASUREMENT SCIENCE AND TECHNOLOGY | 1991年 / 2卷 / 04期
关键词：
D O I：
10.1088/0957-0233/2/4/010
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
A critical discussion is given of some of the experimental parameters involved in measurement of the three-, four- and five-fold differential cross sections obtained in (e, 2e), (e, (3 - 1)e) and (e, 3e) experiments, respectively. Features observed in the triple coincidence time-delay spectrum are attributed to fully accidental, semi-accidental or true triple coincidence events. Formulas are given that allow computation of the true coincidence rate, the percentage statistical error and the signal-to-background ratio, and to optimize the gas density-electron beam current product for any given experiment. For the first time, to our knowledge, the effective coincidence energy resolutions and transmission functions are defined, and their importance clearly demonstrated.
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页码：327 / 333
页数：7
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