Institute of Physics Belgrade, University of Belgrade, Pregrevica 118, 11080 Belgrade, Serbia.
Faculty of Science, University of Banja Luka, Mladena Stojanovića 2, 78000 Banja Luka, Republic of Srpska, Bosnia and Herzegovina.
Int J Mol Sci. 2021 Jan 11;22(2):647. doi: 10.3390/ijms22020647.
Electron interaction with methane molecule and accurate determination of its elastic cross-section is a demanding task for both experimental and theoretical standpoints and relevant for our better understanding of the processes in Earth's and Solar outer planet atmospheres, the greenhouse effect or in plasma physics applications like vapor deposition, complex plasma-wall interactions and edge plasma regions of Tokamak. Methane can serve as a test molecule for advancing novel electron-molecule collision theories. We present a combined experimental and theoretical study of the elastic electron differential cross-section from methane molecule, as well as integral and momentum transfer cross-sections in the intermediate energy range (50-300 eV). The experimental setup, based on a crossed beam technique, comprising of an electron gun, a single capillary gas needle and detection system with a channeltron is used in the measurements. The absolute values for cross-sections are obtained by relative-flow method, using argon as a reference. Theoretical results are acquired using two approximations: simple sum of individual atomic cross-sections and the other with molecular effect taken into the account.
电子与甲烷分子的相互作用以及对其弹性截面的精确确定，无论是从实验还是理论角度来看，都是一项艰巨的任务，这对于我们更好地理解地球和太阳系外行星大气中的过程、温室效应，或者在等离子体物理应用如蒸汽沉积、复杂的等离子体-壁相互作用和托卡马克的边缘等离子体区域都具有重要意义。甲烷可以作为推进新型电子-分子碰撞理论的测试分子。我们对甲烷分子的弹性电子微分截面以及中间能量范围（50-300 eV）的积分和动量转移截面进行了实验和理论的综合研究。实验装置基于交叉束技术，包括电子枪、单毛细管气体针和带有通道晶体管的检测系统，用于测量。通过使用氩气作为参考的相对流动方法，获得截面的绝对值。理论结果采用两种近似方法获得：单个原子截面的简单求和，以及考虑分子效应的另一种方法。
