Resonance Raman Scattering in Photodissociating Halomethanes

✍ Scribed by F. Duschek; M. Schmitt; P. Vogt; A. Materny; W. Kiefer

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 584 KB
• Volume: 28
• Category: Article
• ISSN: 0377-0486
• DOI: 10.1002/(sici)1097-4555(199706)28:6<445::aid-jrs126>3.0.co;2-4

✦ Synopsis

Gas-phase resonance Raman spectra of the halomethanes and were recorded with excitation CH 3 I, CH 2 ICl CH 2 I 2 wavelengths of an argon ion laser between 275.4 and 363.8 nm. The 275.4 nm laser line is resonant with the A-band absorption transition of the molecules and and was used for Raman excitation. Resonance Raman CH 3 I CH 2 ICl spectra of these two molecules are then dominated by an overtone progression of the resonance enhanced C-I stretching mode and weak combination bands. The structure of the resonantly enhanced vibrational bands of 3 1 -3 4 are interpreted in terms of hot bands and rotational transitions in symmetric top molecules. The spectra of CH 3 I this mode were simulated applying a model for linear and for non-linear symmetric top molecules. For (3 1 -3 4 ) which has four absorption maxima between 230 and 370 nm, further excitation wavelengths of an argon CH 2 I 2 , ion laser (335.1, 351.1 and 363.8 nm) were used to record resonance Raman spectra. All these spectra show several overtones and combination bands of the symmetric and antisymmetric stretching modes and 1997 by CI 2 m 3 m 9 . (