Knowledge Bank

The self quenching behavior of selected $v\prime$ and $J\prime$ states of $Br2$ (B) has been investigated in the 0.005-3 torr pressure range. Direct decay lifetime measurements were used to construct Stern-Volmer plots, and for low J^{\prime} values a pronounced curvature of these plots was noted at low pressures torr). $Br2$ (B) exhibits a strong rotationally dependent $predissociation,1$ and the curved Stern-Volmer plots have been intepreted in terms of highly efficient rotational energy transfer to predissociating levels. This process has been simulated using a master equation approach, and approximate rates for electronic quenching $(3\times 10-10cm3molecule-1s-1)$ and rotational energy transfer $(\Sigma fkf=8\times 10-10cm3molecule-1s-1)$ have been extracted from the model. Details of the experiment and computational modeling will be presented, and the compatibility of the rate data with the operating parameters of the $Br2$ $laser2$ will be discussed. Work supported by AFOSR under grant 83-0173.