FAR ULTRAVIOLET SPECTRA OF HALOMETHANE MOLECULES

Abstract

The absorption spectra of gaseous halomethane molecules will be given down to 1200 \AA. The effect on the absorption bands of additional halide substitution will be described. The interpretation of the bands will be given for the independent systems method and compared where possible to the molecular orbital theory. Calculations using a modified CNDO/2 program will be given for some molecules. The effect of the sigma bonding and nonbonding electrons of the halide atoms on the absorption spectra will be inferred. The bond strengths for the bonds will be compared to the classical sigma $\sigma\longrightarrow \sigma^{*}$ transitions. The spectra have been taken on a McPherson Model 225 one meter normal incidence scanning monochromator.