Internal Energy of Reaction Products by Velocity Analysis. II. Scattered KBr* from the Crossed Molecular Beam Reaction K+Br2

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Abstract
The velocity distribution of excited KBr* formed in reactive collision between crossed beams of velocity‐selected K and thermal Br2 has been measured at several laboratory scattering angles and initial relative kinetic energies of 1.26, 2.14, and 3.27 kcal/mole. From these observations qualitative information may be inferred regarding the internal energy distribution function and the angular distribution of reactive scattering in the center‐of‐mass (c.m.) system. It is found that (1) the KBr* internal energy distribution is broad, extending over a range of at least 30 kcal/mole, with most of the 46 kcal/mole exothermicity of the reaction appearing in the form of internal excitation of KBr*, and (2) the angular distribution of reactive scattering in the ``forward'' direction (KBr preferring the direction of the incident K in the c.m. system), is characterized by a cone in the c.m. with an angle of generation of at least 30°.