The collision-energy-resolved Penning ionization electron spectroscopy was used for investigating the occurrence of ionization of bromomethanes upon collision with metastable He*(23S) atoms. Lone-pair (n Br) orbitals of Br4p characters were found to have larger ionization cross sections than σc-Br orbitals. The negative collision-energy dependence of the partial ionization cross sections associated to the S* band indicated an attractive interaction for the entrance channel. The results of the collision-energy dependence of the partial ionization cross sections shows that the interaction potential between the molecule and the He excited state atom is highly anisotropic.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physical and Theoretical Chemistry