Experimental chemical kinetics: a study of chemical reactions by means of moleclar beam techniques. Progress report, October 1972--October 1973

Abstract

The unfolding of molecular beam scattering data to yield cross sections, the interpretation of the amplitudes of the glory oscillations in the velocity dependence of the total cross section and the construction of a simple molecular beam apparatus for student experiments on reactive scattering are described in publications. Inelastic scattering of CsCl and CsI by Ar and Xe are studied over a range of relative kinetic energy of 1 to 2 kcal mole/sup -1/ at several laboratory angles. The inelastic cross sections are a substantial fraction of the elastic cross sections at large angles. Beams of halogen containing molecules produce negative ions when they hit surfaces of Nb and LaB/sub 6/. On the latter the efficiency of formation of negative ions can be as great as 0.1 for iodides and still larger for bromides. Experiments have shown that a beam of CH/sub 2/Cl/sub 2/ molecules can be accelerated without significant attenuation by interaction with a beam of electrons. The increase in velocity was up to 20%. Attempts to study the elastic cross sections for the scattering of halogen atoms by the rare gases and the reactive cross sections for the scattering of molecules with internal excitation are continuing. A list of publications is included. (auth)