VUV FRAGMENTATION OF SOME HYDROFLUOROCARBON CATIONS STUDIED USING COINCIDENCE TECHNIQUES

Weidong Zhou, D. P. Seccombe, R. Y. L. Chim and R. P. Tuckett
Additional contact information
Weidong Zhou: School of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
D. P. Seccombe: School of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
R. Y. L. Chim: School of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK
R. P. Tuckett: School of Chemistry, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK

Surface Review and Letters (SRL), 2002, vol. 09, issue 01, 153-158

Abstract: Threshold photoelectron–photoion coincidence (TPEPICO) spectroscopy has been used to investigate the decay dynamics of the valence electronic states of the parent cation of several hydrofluorocarbons (HFC), based on fluorine-substituted ethane, in the energy range 11–25 eV. We present data forCF3–CHF2,CF3–CH2F,CF3–CH3andCHF2–CH3. The threshold photoelectron spectra (TPES) of these molecules show a common feature of a broad, relatively weak ground state, associated with electron removal from the highest-occupied molecular orbital (HOMO) having mainly C–C σ-bonding character. Adiabatic and vertical ionisation energies for the HOMO of the four HFCs are presented, together with corresponding values fromab initiocalculations. For those lower-energy molecular orbitals associated with non-bonding fluorine2pπlone pair electrons, these electronic states of the HFC cation decay impulsively by C–F bond fission with considerable release of translational kinetic energy. Appearance energies are presented for formation of the daughter cation formed by such a process (e.g.CF3–CHF+), together withab initioenergies of the corresponding dissociation channel (e.g.CF3–CHF++F). Values for the translational kinetic energy released are compared with the predictions of a pure-impulsive model.

Date: 2002
References: Add references at CitEc
Citations:

Downloads: (external link)
http://www.worldscientific.com/doi/abs/10.1142/S0218625X0200204X
Access to full text is restricted to subscribers

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:wsi:srlxxx:v:09:y:2002:i:01:n:s0218625x0200204x

Ordering information: This journal article can be ordered from

DOI: 10.1142/S0218625X0200204X

Access Statistics for this article

Surface Review and Letters (SRL) is currently edited by S Y Tong

More articles in Surface Review and Letters (SRL) from World Scientific Publishing Co. Pte. Ltd.
Bibliographic data for series maintained by Tai Tone Lim ().