J. Phys. IV France 01 (1991) C7-579-C7-582
TWO-PHOTON LASER-ASSISTED REACTIONS OF Xe WITH HALOGEN CONTAINING MOLECULESD.W. SETSER and Jun. QIN
Department of Chemistry, Kansas State University, Manhattan, KS 66506, USA
The two-photon, laser-assisted reactions between Xe (or Kr) and several halogen containing molecules have been observed by focusing the output of a pulsed dye-laser into dilute gas mixtures of Xe and the reagent. The occurrence of the reaction is detected from the B-X fluorescence of the XeCl*, XeBr* and XeI* products. Results from studies with SOCl2, CCl4, CCl3Br, CCl2Br2, Br2 and I2 are emphasized. In some instances the utilization of laser pulses of different frequency to drive the reaction enhanced the two-photon cross section, relative to one-color experiments, because of a more favorable energy resonance with the one-photon RX* intermediate state. Direct excitation from bound and free Xe/RX pairs on the van der Waals potential to the ion-pair, Xe+RX-, reactive potential explains most aspects of these laser-assisted reactions. One application of these laser-assisted reactions is as a very rapid generation source for XeCl* and KrF* molecules in order to study their quenching and relaxation kinetics.
© EDP Sciences 1991