The Rotational Excitation of Molecules by Slow Electrons

摘要: Publisher Summary The excitation of molecular rotation is an important energy-loss mechanism for low-energy electrons in gases. When electron beam fired into a gas, the far-infrared emissions from rotationally excited molecules will increase. However, expected intensity increase too low, especially non-polar targets, to be useful determination relevant cross section. Resonance phenomena are often scattering atoms and molecules. These processes through compound state incident target. Two major types resonance usually distinguished electron–atom collision. One electron-excited that corresponds temporary electronic target with captured its field. other because capture by adiabatic interaction. Usually centrifugal potential barrier prevents inner region field escaping outside.