화학공학소재연구정보센터
Journal of Physical Chemistry, Vol.99, No.29, 11350-11356, 1995
Bond-Dissociation Energies of Pbbr2(G) and the Dye Laser-Induced Fluorescence Excitation Spectrum of PbBr(A-X)
An equilibrium thermodynamics determination of the individual bond dissociation energies in PbBr2(g) is presented, yielding 66.5 +/- 3.5 and 59.4 +/- 3.5 kcal/mol for the successive removal of Br atoms. These results are based on atomic absorption measurements of Pb(g) number densities and laser-induced fluorescence measurements of relative PbBr(g) number densities in equilibrium with PbBr2(g) at temperatures between 700 and 850 degrees C. The laser-induced fluorescence excitation spectrum of PbBr(A-X), excited between 467 and 485 nm and observed between 516 and 536 Mm, is reported. Lifetime measurements of PbBr(A) at various PbBr2 number densities yielded a collision-free lifetime of similar to 200 ns and a PbBr2 collisional quenching constant of 1.42 x 10(-9) cm(3) molecule(-1) s(-1).