The electron impact spectra of the fluoromethanes

About the vacuum UV photoabsorption spectrum of methyl fluoride (CH3F): the fine structure and its vibrational analysis

“…This probably indicates that this peak corresponds to a (5a 1 /1e) → 4s/3d transition. This is in agreement with earlier reports [6,20,22]. This transition was also identified as being responsible for the dissociative autoionization producing thermal and nearly thermal CH 3 + fragment ions when using the Ne(I) lines for ionization [6].…”

“…Except for the data published by Wu et al [19], who measured the photoabsorption of CH 3 F above 16 eV only, all the measurements agree fairly well with each other. The electron energy loss spectroscopic work of Harshbarger et al [22] is consistent with the photoabsorption data.…”

“…The term value associated with this band is 1.77 eV and the effective quantum number is n* = 2.772. Harshbarger et al [22] and Olney et al [20] assigned this band to a 2e → 4s/3d transition.…”

“…This strongly suggests a (5a 1 /1e) → 3s transition where the 5a 1 and the le orbitals are nearly degenerate. On the basis of the peak width, Harshbarger et al [22] suggested that within the energy range of 12.5-14 eV, (5a 1 /1e) → 3s and (5a 1 / 1e) → 3p transitions should occur.…”

Electron cross section set for CHF3

“…With a view to dissociative excitation, therefore, excitations out of the 6a 1 orbital are of special interest. Accordingly, we considered the singlet and triplet states arising from promotion of an electron from 6a 1 to 7a 1 and from 6a 1 18 using considerably more sophisticated wavefunctions ͑multirefer-ence singles-and-doubles configuration interaction͒, obtained 10.89 eV for the à 1 A 1 threshold and 11.76 eV for the B 1 E threshold, while high-energy electron impact studies 19 showed a threshold at 10.92 eV assigned as 6a 1 →3s ͑i.e., à 1 A 1 ͒ and one at 11.95 eV assigned as 6a 1 →3 p ͑i.e., B 1 E͒.…”