TOTAL CROSS-SECTION MEASUREMENTS FOR POSITRON AND ELECTRON-SCATTERING ON HYDROCARBONS BETWEEN 5-EV AND 400-EV
TOTAL CROSS-SECTION MEASUREMENTS FOR POSITRON AND ELECTRON-SCATTERING ON HYDROCARBONS BETWEEN 5-EV AND 400-EV
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DOI：
10.1088/0022-3700/18/16/019
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发表时间：
1985-01-01
影响因子：
1.6
通讯作者：
SINAPIUS, G
中科院分区：
文献类型：
--
作者：
FLOEDER, K;FROMME, D;SINAPIUS, G
利用22 Na源和钨慢化剂产生的正电子和阴极电子，测量了甲烷、乙烷、乙烯、丙烷、丙烯、环丙烷、正丁烷、异丁烷和1-丁烯的总截面。正如所料，正电子的横截面比电子的横截面小，而且两者都随着分子的大小而增大。在30 eV以上，正电子和电子截面随着能量的增加而减小，并且彼此接近。所有测得的100和400 eV之间的正电子和电子截面都可以用一个包含能量、分子电子数和三个拟合参数的公式来描述。
The total cross sections of methane, ethane, ethene, propane, propene, cyclopropane, n-butane, isobutane and 1-butene were measured in a transmission experiment utilising positrons from a 22 Na source and a tungsten moderator and electrons from a thermionic cathode. As expected the cross sections for positrons are smaller than those for electrons and both grow with the size of the molecules. Above 30 eV the positron and electron cross sections decrease with increasing energy and approach each other. All measured positron and electron cross sections between 100 and 400 eV can be described by a formula containing the energy, the number of molecular electrons and only three fit parameters.