Table of Contents
Laser Chemistry
Volume 10, Issue 5-6, Pages 389-403

Reaction Dynamics of Electronically Excited Barium Atoms With Free Molecules and Molecular Clusters

Service de Physique des Atomes et des Surfaces, Centre d'Etudes Nucléaires de Saclay, Gif-sur-Yvette Cedex 91191, France

Received 23 March 1990; Accepted 15 April 1990

Copyright © 1990 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


In this review article we describe some recent results obtained in our laboratory. The successful combination of crossed molecular beam techniques and various laser excitation schemes has been used to study chemiluminescent reactions of ground and excited electronic states of barium with free molecules and molecular clusters. Studies include the identification of reaction products in cases where many chemiluminescent reaction channels are opened. The case of Ba(6sp1P1,6s5d1D2,6s5d3Dj) reacting with H20, methanol, ethanol, propanol-1, propanol-2, methyl-2, propanol-2, butanol-l, allyl alcohol, dimethyl ether, diethyl ether and diallyl ether is examined. A reaction mechanism is proposed which accounts for all these reactions. Studies reported in this review also include the unravelling of reaction dynamics where various forms of energy are mixed (electronic and kinetic energy). This is shown in studies of Ba(1D2and1P1)+O2 reactions. Finally the role of molecular clusters as reactant is examined. Evidence is provided that clusters of N20, H20 and CO2, in collision with Ba(1S0and1P1)+O2, do not lead efficiently to both reactive and non reactive luminescent exit channels.