Vacuum UV fluorescence excitation spectroscopy of CF4 and CF3Br in the range 45–140 nm

✍ Scribed by J.C. Creasey; P.A. Hatherly; I.R. Lambert; R.P. Tuckett

• Publisher: Elsevier Science
• Year: 1992
• Tongue: English
• Weight: 784 KB
• Volume: 188
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(92)90013-d

✦ Synopsis

Fluorescence excitation spectra of CF, and CFIBr have been measured in the range 45-95 nm and 50-l 40 nm respectively using synchrotmn radiation. Both resonant and non-resonant peaks are observed, corresponding to neutral fragment (e.g. CF,) and parent ion (e.g. CF,+ ) emission. Analysis of the fluorescence has shown that bands from CF, are due to CF;, CFZ ,& 'B, and CF,+ e 2Tz. Bands from CF3Br are due to CR, CF, A 'B, and possibly CF,Br+ i? 'A,. The radiative lifetimes ofall the fluorescing bands have been measured. Some of the CF,Br bands show biexponential behaviour. These results are interpreted by comparison with previous photoabsorption and electron energy loss spectra.