Total Cross Sections for Electron and Positron Scattering on Molecules: In Search of the Dispersion Relation

被引：4

作者：

Carelli, Fabio ^{[1
]}

Fedus, Kamil ^{[2
]}

Karwasz, Grzegorz ^{[2
]}

机构：

[1] Nicolaus Copernicus Univ, Ctr Excellence Astrochem & Astrophys, Fac Phys Astron & Informat, Grudziadzka 5-7, PL-87100 Torun, Poland

[2] Nicolaus Copernicus Univ, Inst Phys, Fac Phys Astron & Informat, Grudziadzka 5-7, PL-87100 Torun, Poland

来源：

ATOMS | 2021年 / 9卷 / 04期

关键词：

electron scattering; positron scattering; total cross-sections; dispersion relation; INTERMEDIATE-ENERGY POSITRONS; RAMSAUER-TOWNSEND MINIMUM; EFFECTIVE-RANGE THEORY; ELASTIC-SCATTERING; VIBRATIONAL-EXCITATION; IMPACT IONIZATION; CO2; MOLECULES; CH4; NOBLE-GASES; ARGON;

D O I：

10.3390/atoms9040097

中图分类号：

O64 [物理化学（理论化学）、化学物理学]; O56 [分子物理学、原子物理学];

学科分类号：

070203 ; 070304 ; 081704 ; 1406 ;

摘要：

More than one hundred years of experimental and theoretical investigations of electron scattering in gases delivered cross-sections in a wide energy range, from few meV to keV. An analogy in optics, characterizing different materials, comes under the name of the dispersion relation, i.e., of the dependence of the refraction index on the light wavelength. The dispersion relation for electron (and positron) scattering was hypothesized in the 1970s, but without clear results. Here, we review experimental, theoretical, and semi-empirical cross-sections for N2, CO2, CH4, and CF4 in search of any hint for such a relation-unfortunately, without satisfactory conclusions.

引用

页数：14

共 99 条

[1] EXCITATION OF VIBRATIONAL LEVELS UP TO UPSILON = 17 IN N-2 BY ELECTRON-IMPACT IN THE 3-5 EV REGION [J].