VUV photon induced fluorescence study of SF5CF3

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, Richard Tuckett, M de Simone

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


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