The dissociative ionization of methyl fluoride. The formation of CH2+ and CH3+

Locht, Robert; Momigny, J.

doi:10.1016/0168-1176(86)85052-2

Cited by 21 publications

(62 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Under non-coincidence conditions, a fixed wavelength photoionization experiment [4,5] using the HeI (58.4 nm) and NeI (73.58-74.37 nm) resonance lines showed "thermal" as well as "energetic" CH 3 + ions at both wavelengths, in agreement with the electroionization results. The two components of the ion kinetic energy distribution have about the same integrated intensity.…”

Section: Introductionsupporting

confidence: 77%

“…The CH 3 + ion production from CH 3 F has recently been reinvestigated by dissociative electroionization with ion energy analysis [4]. Under non-coincidence conditions, a fixed wavelength photoionization experiment [4,5] using the HeI (58.4 nm) and NeI (73.58-74.37 nm) resonance lines showed "thermal" as well as "energetic" CH 3 + ions at both wavelengths, in agreement with the electroionization results.…”

Section: Introductionsupporting

confidence: 62%

See 1 more Smart Citation

A mass spectrometric photoionization study of CH3F. The CH+2, CH+3 and CH2F+ ion formation

et al. 1987

Self Cite

View full text Add to dashboard Cite

The decay of CH 3 F + in the CH 2 + , CH 3 + and CH 2 F + dissociation channels has been investigated by photoionization mass spectrometry using synchrotron radiation in the energy range 10-25 eV. The photoabsorption curve of CH 3 F and the ionization efficiency curves of CH 2 + , CH 3 + and CH 2 F + as well as the translational energy spectra and the kinetic energy versus appearance energy diagram for CH 3 + were recorded. For the three fragment ions dissociative autoionization is a prominent formation process. Direct dissociative ionization is observed for the same ions through the decomposition of the CH 3 F + (Ã 2 A 1 + B 2 E) state at 16.1 eV as well as presumably of the C 2 A 1 state at about 22.5 eV.

show abstract

Section: Introductionsupporting

confidence: 77%

Section: Introductionsupporting

confidence: 62%

A mass spectrometric photoionization study of CH3F. The CH+2, CH+3 and CH2F+ ion formation

et al. 1987

Self Cite

View full text Add to dashboard Cite

show abstract

“…passing through a maximum value at E T =0.4 eV, it decreases linearly over the 1.0-1.8 eV range. A bi-modal character of surprisal diagrams has occasionally been reported [6] #1 , [7][8][9] and attributed to the simultaneous existence of two dynamical behaviours in the process under consideration. It may be that the observed diagram, represented in fig.…”

Section: The Translational Energy Surprisalmentioning

confidence: 99%

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

Momigny

Locht

1993

Chemical Physics Letters

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…In the recent past, we thoroughly investigated several molecular systems, e.g. the monohalogenated derivatives of methane CH 3 F [1][2][3][4][5], CH 3 Cl [6][7][8] and CH 3 Br [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

The vacuum UV photoabsorption spectroscopy of vinyl fluoride (C2H3F): The vibrational fine structure and its analysis

et al. 2009

Self Cite

View full text Add to dashboard Cite

The vacuum UV photoabsorption spectrum of C 2 H 3 F has been examined in detail between 6 eV and 25 eV photon energy by using synchrotron radiation. The analysis of the data is supported by ab initio quantum mechanical calculations applied to valence and Rydberg excited states of C 2 H 3 F. At 7.6 eV the π → π * and the 2a" → 3s transitions are observed. An analysis is proposed and applied to the mixed fine structure belonging to these transitions. For the π → π * transition one single long vibrational progression is observed with hcω e = 95 ± 7 meV (766 ± 56 cm -1 ) and its adiabatic excitation energy is 6.892 eV (55 588 cm -1 ). The 2a" → 3s transition is characterized by a single short progression with hcω e = 167 ± 10 meV (1350 ± 80 cm -1 ) starting at 6.974 eV (56 249 cm -1 ). From the present ab initio calculations these two wavenumbers best correspond to the vibrational modes υ 9 (CH 2 rock in-plane, FCC-bend) and υ 6 (CH 2 rock in-plane, CF stretch) calculated at 615 cm -1 in the π * state and 1315 cm -1 in the ( 2 A")3s Rydberg state respectively. The C=C stretching could not be excluded. The dense structured spectrum observed between 8.0 eV and 10.5 eV has been analyzed in terms of vibronic transitions to Rydberg states all converging to the C 2 H 3 F + (X A") ionic ground state. An analysis of the associated complex fine structure of the individual Rydberg states has been attempted providing average values of the wavenumbers, e.g., for the ( 2 A")3p Rydberg state hcω 9 = 60 ± 1 meV (or 484 ± 8 cm -1 ), hcω 7 = 151 ± 7 meV (or 1218 ± 60 cm -1 ), hcω 4 = 191 ± 3 meV (or 1540 ± 24 cm -1 ). The assignment of hcω = 105 ± 5 meV (or 823 ± 40 cm -1 ) is discussed. These experimental values are in good agreement with the theoretical predictions for C 2 H 3 F + [R. Locht, B. Leyh, D. Dehareng, K. Hottmann, H. Baumgärtel, Chem. Phys. (in press)]. Above 10.5 eV and up to 25 eV several broad and strong bands are tentatively assigned to transitions to valence (V-V) and/or Rydberg (V-R) states converging to excited ionic states of C 2 H 3 F.

show abstract

The dissociative ionization of methyl fluoride. The formation of CH2+ and CH3+

Cited by 21 publications

References 11 publications

A mass spectrometric photoionization study of CH3F. The CH+2, CH+3 and CH2F+ ion formation

A mass spectrometric photoionization study of CH3F. The CH+2, CH+3 and CH2F+ ion formation

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

The vacuum UV photoabsorption spectroscopy of vinyl fluoride (C2H3F): The vibrational fine structure and its analysis

Contact Info

Product

Resources

About