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

• Published in: The Journal of chemical physics 1965-08, Vol.43 (4), p.1140-1144
• Main Authors: Grosser, Arthur E., Bernstein, Richard B.
• Format: Article
• Language: English
• ISSN: 0021-9606; 1089-7690
• DOI: 10.1063/1.1696893

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°.