Interaction potentials for Br(2p) + Ar, Kr, Xe (1s) by the crossed molecular beams method. Interim report

Angular distributions of Br((2)P sub 3/2, 1/2) scattered off Ar, Kr, and Xe ((1) S sub 0) in the thermal energy range were measured in crossed molecular beams experiments. Interaction potentials for the X(1/2) and I(3/2) states are derived by using an approximate elastic scattering analysis, which neglects interstate coupling, as previously done for F-Xe,Kr,Ar,Ne and C1-Xe. While the Br-Xe X(1/2) potential (epsilon = 0.645 kcal/mole, r sub m = 3.80 A) shows a stronger interaction than the interaction potential of Kr-Xe, the Br-Kr (epsilon = 0.460 kcal/mole, r sub m = 3.90 A) and Br-Ar (epsilon = 0.380 kcal/mole, r sub m = 3.73 A) X(1/2) potentials are closer to those of the corresponding rare gas pairs. The I(3/2) potential for all three systems is found to have a shallower epsilon, a slightly larger r sub m and a more repulsive wall than the 1(Sigma +) potential of the corresponding rare gas pair. The origin of these interactions is discussed and an attempt to examine the rare gas halides ground state bonding is presented.

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