The appearance of C2H+3 ions from C2H3F by non-resonant photoionization. A translational energy surprisal analysis

Abstract

It is shown that for a photon energy of 16.85 eV, the translational energy surprisal of the C 2 H 3 + + F dissociation products from C 2 H 3 F + has a bimodal behaviour. The possibility of considering the bimodal surprisal as due to the superposition of two translational energy distributions is consistent with the theoretical assumption of the concurrence of two channels in this dissociation process. The characteristics of these distributions, i.e. the energy width and the relative abundance, are in agreement with the results of an ab initio quantum-mechanical calculation of the dynamics of this dissociation. They are consistent with the simultaneous occurrence of a statistical dissociation of C 2 H 3 F + ( X 2 A') into C 2 H 3 + ( X 1 A') and an isolated state dissociation of C 2 H 3 F + ( C 2 A") into C 2 H 3 + (ã 3 A"). The negative λ values obtained for the surprisal of both these distributions indicate an inversion of the translational level population of the dissociation products.

The vacuum UV photoabsorption spectrum of methyl chloride (CH3Cl) and its perdeuterated isotopomer CD3Cl I. A Rydberg series analysis

“…Its photoabsorption spectrum has been reported several times, in different wavelength regions and under different experimental conditions. To the best of our knowledge, the photoabsorption spectroscopy of the perdeuterated isotopomer CD 3 Cl has been reported only once in the 165-145 nm wavelength region [10].…”

“…We extensively examined the vacuum UV spectroscopy, the photoelectron spectroscopy (TPES and He-I) and the mass spectrometric photoionization of the halogenated derivatives of methane and ethylene. For many cases, the major importance of the localization and identification of neutral molecular states embedded in the ionization continua has been demonstrated [3][4][5][6][7].…”

“…The monosubstituted species received much less attention, excepting mono-chloromethane CH 3 Cl. Its photoabsorption spectrum has been reported several times, in different wavelength regions and under different experimental conditions.…”

“…The first observation of the vacuum UV photoabsorption spectrum of CH 3 Cl was reported by Price [11] in the wavelength region of 100-200 nm (6.2-12.4 eV) using a grazing incidence monochromator and the Lyman continuum as excitation source. The observed bands were classified into two Rydberg series converging to the two first ionization limits, assigned to two components separated by 650 cm -1 .…”

“…The most extensive study of the vacuum UV photoabsorption spectrum of CH 3 Cl has been reported by Truch et al [15]. The spectrum was investigated in the wavelength region of 68 600-94 700 cm -1 (8.50-11.74 eV).…”