REACTIVE SCATTERING OF K BY HBR, DBR IN CROSSED MOLECULAR BEAMS - ANGULAR AND VELOCITY DISTRIBUTIONS OF KBR IN LABORATORY AND CM SYSTEMS

Measurements of the velocity and angular distribution of KBr formed in reactive collisions between crossed molecular beams of velocity-selected K and thermal HBr(DBr) at a collision energy of 2.8 kcal/mole are described. The results have been subjected to a computer analysis to extract information about the center-of-mass (c.m.) distributions. For both isotopic systems, the c.m. recoil energy distributions are broad, and are similar in shape. The c.m. angular distributions are also broad; HBr shows relatively greater wide-angle scattering than DBr. The total reactive cross section for K+HBr is 40% larger than that for K+DBr. Measurements of the angular distribution of nonreactively scattered K agree well with the results of Airey et al. in the region of the rainbow angle.