A novel spectroscopy using ultrafast two-pulse excitation of large polyatomic molecules

✍ Scribed by A. Seilmeier; W. Kaiser; A. Laubereau; S.F. Fischer

• Publisher: Elsevier Science
• Year: 1978
• Tongue: English
• Weight: 558 KB
• Volume: 58
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(78)80282-6

✦ Synopsis

A first infrared pulse at frequency (\nu_{1}) interacts with vibrational states in (S_{0}) and a second visible pulse at (\nu_{2}) promotes the excited molecules to the (S_{1}) state from where they nuoresce. Tuning the frequency (v_{2}) over (600 \mathrm{~cm}^{-1}) allows the observation of a detailed spectrum which gives information on vibrational states in (S_{0}) and on vibronic states in (S_{1}) together with corresponding Franck-Condon factors. The spectra diffex drastically from the common broad and featureless absorption and fluorescence bands.