title: VUV photon induced fluorescence study of SF5CF3.
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 CF(3) and CF(2) 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.
authors.affiliation: Department of Physics, Section of Atomic and Molecular Physics, Royal Institute of Technology, 10691 Stockholm, Sweden. j.alvarez@iqfr.es
authors.forename: Jesus
authors.initials: J
authors.lastname: Alvarez Ruiz
authors.forename: Antti
authors.initials: A
authors.lastname: Kivimäki
authors.forename: Marek
authors.initials: M
authors.lastname: Stankiewicz
authors.forename: Emilio
authors.initials: E
authors.lastname: Melero García
authors.forename: Marcello
authors.initials: M
authors.lastname: Coreno
authors.forename: Sahangir
authors.initials: S
authors.lastname: Ali
authors.forename: Jaroslaw
authors.initials: J
authors.lastname: Koperski
authors.forename: Elisabeth
authors.initials: E
authors.lastname: Rachlew
authors.forename: Gemma
authors.initials: G
authors.lastname: Vall-Llosera I Serrano
authors.forename: Vitaliy
authors.initials: V
authors.lastname: Feyer
authors.forename: Richard
authors.initials: R
authors.lastname: Tuckett
mesh_terms: D000393:Air Pollutants / Q000737:chemistry* / Q000528:radiation effects; D017752:Greenhouse Effect; D006845:Hydrocarbons, Fluorinated / Q000737:chemistry* / Q000528:radiation effects; D017785:Photons; D013050:Spectrometry, Fluorescence / Q000379:methods*; D013056:Spectrophotometry, Ultraviolet; D013457:Sulfur Compounds / Q000737:chemistry* / Q000528:radiation effects
chemical_list: D000393:Air Pollutants; D006845:Hydrocarbons, Fluorinated; C516032:SF5CF3; D013457:Sulfur Compounds