Kinetic Measurements on the Fate of Electronically Excited BaO from the Ba/N2O Chemical Pumping Reaction.

摘要

There is a vital interest in an effective high-power visible laser. As pumps for such lasers,highly exothermic chemiluminescent metal atom oxidation reactions offer considerable promise. Most of the research on such reactions has been devoted to the kinetics of emitter formation,photon yield measurements and spectral analysis. However,to optimize a system for possible use as a visible laser,it is also necessary to know the rates at which species expected to be present in an operational laser quench and vibrationally relax the emitting electronic state,and to know the rate at which these species deplete the lower laser level. In the present work,rate coefficients for the electronic quenching and vibrational relaxation of the potential upper lasing state have been measured for BaO(A singlet Sigma),formed in the reaction,Ba + N2O to BaO + N2,using Ar,He, N2, O2, N2O,and Ba as the quenching/relaxation agents. BaO from reaction (1) was studied because this reaction offered the most promise of the candidate pumping reactions discovered at the time this work was initiated.