Quenching and Rotational Energy Transfer in Molecular Bromine: Br2(B)

This study investigates the rotational energy transfer processes of optically excited bromine molecules in the presence of several collision partners. Resolved laser induced fluorescence spectra of collisionally populated rotational states were analyzed by means of Stern Volmer analysis. Total rotational removal rate coefficients and state-to-state rotational removal rate coefficients for the v11,J35 level of Br2B were obtained for collisions with Br2X, He, Ar and Xe. Rotational removal rate coefficients were also obtained for the v11, J26 and 47 v14, J36 states of Br2B with collisions with Ar. Total rotational removal rate for Br2 self quenching found to be 3.98-0.2x10-10 cm3Molec-Sec. Rate coefficients were scaled with respect to reduced mass of collision system and in accordance with exponential energy gap scaling law. Energy gap scaling law fit data well. Rotational removal rates displayed behavior to increase with increase in v and J of optically excited parent state.