Rotationally inelastic scattering of OH (2II3/2, v=0, J=3/2, f) by HBr (1Σ, v=0, J<4)

Relative state-to-state cross sections of OH molecules in the (2)Pi(3/2), v=0, J=3/2, M-J=3/2, f state have been determined for transitions up to (2)Pi(3/2), v=0, J=11/2, f and (2)Pi(1/2), v=0, J=7/2, e states by collisions with HBr molecules ((1)Sigma, v=0, J < 4) at 750 cm(-1) collision energy. In order to investigate features of the anisotropy of the OH-HBr potential energy surface, the steric asymmetries, which account for the effect of the OH orientation with respect to the collision partner, have been measured. A comparison with other systems previously studied shows strong similarities with the OH-HCl system. (c) 2006 American Institute of Physics.