Abstract

Infrared molecular beam depletion spectroscopy has been shown to be a valuable tool for the spectroscopy of hydrogen bonded molecular clusters [1], In order to study intracluster ion-molecule relations we combined the IR-depletion with resonant two-photon ionisation (R2PI) spectroscopy. The schematic set-up of our IR-UV double resonance experiment is shown in Fig. 1. It consists of a pulsed molecular beam, which is crossed by a tuneable UV laser as the ionisation source for the R2PI process. Subsequent mass analysis of the different cluster ions as well as their reaction products is performed in a reflectron time of flight mass spectrometer. A continuously tuneable IR laser beam which is counterpropagated to the molecular beam is used for conducting IR spectroscopy of different cluster species.

© 1996 Optical Society of America