VUV photon induced fluorescence study of SF5CF3

Research output: Contribution to journalArticlepeer-review

Authors

  • Jesus Alvarez Ruiz
  • Antti Kivimäki
  • Marek Stankiewicz
  • Emilio Melero García
  • Marcello Coreno
  • Sahangir Ali
  • Jaroslaw Koperski
  • Elisabeth Rachlew
  • Gemma Vall-llosera I Serrano
  • Vitaliy Feyer
  • M de Simone

Colleges, School and Institutes

Abstract

The interaction of SF\(_5\)CF\(_3\) with vacuum-UV radiation has been investigated by photon induced fluorescence spectroscopy. Total fluorescence yield and dispersed fluorescence spectra of SF\(_5\)CF\(_3\) were recorded in the 200-1000 nm fluorescence window. In all cases, the fluorescence spectra resemble those of CF\(_3\)X (X=H, F, Cl, and Br) molecules. At photon energies below 20 eV, the emission is attributed to the excited CF\(_3\) and CF\(_2\) fragments. The threshold for the CF\(_3\) emission is 10.2 ± 0.2 eV, giving an upper-limit estimate for the SF\(_5\)-CF\(_3\) bond dissociation energy of 3.9 ± 0.3 eV. The excitation functions of the CF3 and CF2 emissions were measured in the photon energy range 13.6 – 27.0 eV. The resonant structures observed in SF\(_5\)CF\(_3\) are attributed to electronic transitions from valence to Rydberg orbitals, following similar assignments in CF\(_3\)X molecules. The photoabsorption spectrum of SF\(_5\)CF\(_3\) shows features at the same energies, indicating a strong contribution from Rydberg excitations.

Details

Original languageEnglish
Pages (from-to)5199-5206
Number of pages8
JournalPhysical Chemistry Chemical Physics
Volume8
Issue number44
Publication statusE-pub ahead of print - 10 Oct 2006