Vibrational Excitation of CO, CO₂ and N₂O by Li⁺ Impact in the Energy Range from 70 eV to 1500 eV

Abstract

Vibrational excitation of CO, CO 2 and N 2 O by Li + impact was studied with an ion energy-loss spectrometer. The excitation takes place in strongly forward scattering above 400 eV, and absolute total cross sections of excitation are obtained easily. For CO, the cross sections of 0→1 and 0→2 excitation are obtained. For CO 2 , the cross sections for the excitation of (010), (020), (001) and (011) levels are determined. The excitation of the symmetric stretching mode (100) is not observed. For N 2 O, the excitation cross sections of (100), (010), (001), (002) and (101) levels are obtained. The experimental results are compared with the first Born approximation, and a possibility of determining the infrared intensities is discussed.