Carbon and fluorine x-ray emission and fluorine K absorption spectra of the fluoromethane molecules, CH4−nFn(0 ≤ n ≤ 4). II

Abstract

The carbon and fluorine Kα emission and the fluorine K absorption spectra of the molecular gases ${\mathrm{CH}}_{\text{4−n}}{\mathrm{F}}_n\text{(0 ≤ n ≤ 4)}$ are reported. All the spectra were obtained on a single flat crystal spectrometer with photon counting. The emission spectra, which were excited by direct electron bombardment, are in fair agreement with an interpretation based on electric dipole transitions between single vacancy states and molecular orbital theory for the molecules. The applicability of x‐ray emission spectra to the determination of orbital order of a molecule is illustrated. The proximity of the resonance structure in the fluorine K absorption spectra for ${\mathrm{CH}}_{\text{4−n}}{\mathrm{F}}_n\text{(1 ≤ n ≤ 4)}$ to their respective fluorine K shell thresholds suggests that the resonance structure is due to transitions to excited valence states $\text{1a→ V*}$ rather than Rydberg states.