Pumping and fishing

Abstract

Double-resonance measurements on molecular jets lead to rate constants under low-temperature conditions which otherwise are not attainable due to condensation effects. Results are discussed for SF₆, NH₃ and C₂H₄ jets. The excitation by CO₂ laser radiation and accompanying collisional energy transfer processes are monitored by Raman scattering (SF₆) or by Franck-Condon laser absorption measurements. The data are compared with information obtained from dimer predissociation spectra.