SPECTRAL SIMPLIFICATION BY ENCLOSIVE FLOW COOLING .2. DIODE-LASER SPECTROSCOPY OF COMPLEX-MOLECULES

Molecules with more than four atoms generally exhibit relatively compl ex vibration-rotation spectra at standard conditions. Often their sing le lines are not resolved and difficult to detect and investigate by h igh-resolution absorption spectroscopy. In this work, diode-laser spec troscopic experiments are presented which use the enclosive flow cooli ng technique for simplification of gas spectra. The fundamental spectr al cooling effects on trifluoromethane are compared with theoretical e xpectations. A considerable reduction of line number density and high optical absorption efficiency were found. Enclosive flow cooling prove d to be robust and easy to manage.