Anharmonic analysis of the PFI-ZEKE photoelectron spectrum of CH2F2 from the ionization potential to the onset of fragmentation
- Journal Article
The complete vibrational fine structure of the pulsed-field-ionization zero-kinetic-energy photoelectron spectrum of difluoromethane is analysed in terms of fully coupled anharmonic calculations. Nine-dimensional ab initio potential functions complete up to five-body terms are constructed directly from ab initio calculations using Mller-Plesset and coupled cluster theory together with up to quadruple- basis sets. The onset of dissociation is accompanied by strongly anharmonic vibrational dynamics involving resonant interactions between both symmetric and non-symmetric modes. The detailed analysis leads to a partial revision of earlier interpretations and provides improved theoretical values for the adiabatic ionization potential IP=12.740 eV and for the lowest dissociation limit D0(H + CHF2+ = 2650 cm -1 both within about 1 kJ mol-1 of experimental estimates.( © Taylor & Francis 2010). Show more
Journal / seriesMolecular Physics
Pages / Article No.
PublisherTaylor & Francis
SubjectCH2F2; Photoelectron spectroscopy; Anharmonicity; Vibrational dynamics; Difluoromethane
Organisational unit03961 - Signorell, Ruth / Signorell, Ruth
NotesPublished in the Special Issue: "High-Resolution Molecular Spectroscopy – HRMS Stabia 2009 (Part 2)".
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