# EFFECT OF RECOIL ON THE VELOCITY DISTRIBUTION OF METASTABLE MOLECULES PRODUCED BY ELECTRON IMPACT.

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 Title: EFFECT OF RECOIL ON THE VELOCITY DISTRIBUTION OF METASTABLE MOLECULES PRODUCED BY ELECTRON IMPACT. Creators: Pearl, John C.; Donnelly, Denis P.; Zorn, Jens C. Issue Date: 1969 Publisher: Ohio State University Abstract: We have used a time-of-flight method to measure the distribution in velocity and angle of the metastable molecules formed by electron bombardment of a collimated beam of thermal energy molecules. The velocity distributions show features, previously unreported but quite pronounced in hydrogen and helium, such as two distinct peaks whose positions and relative intensities depend strongly on the deflection angle and on the energy of the bombarding electrons. The considerations of scattering kinematics developed to explain these observations should facilitate the interpretation of experiments such as the spectroscopy of metastable $atoms^{1}$ and $molecules,^{2}$ time-of-flight studies of repulsive molecular $states,^{3}$ and analyses of the kinetic properties of single-and multi-component $gases.^{4}$ Description: Supported in part by the National Aeronautics and Space Administration. $^{1}$ W. E. Lamb, jr. and R. C. Retherford. Phys. Rev. 79, 549 (1950). $^{2}$ W. Lichten, Phys. Rev. 126, 1020 (1962). $^{3}$ R. Freund and W. Klemperer, J. Chem. Phys. 47, 2897 (1967); R. Clampitt and A. S. Newton, J. Chem. Phys. 50, 1997 (1969). $^{4}$ D. A. Crosby and J. C. Zorn, J. Vac. Sci. Tech. 6, 82 (1969). Author Institution: Randall Laboratory of Physics, University of Michigan URI: http://hdl.handle.net/1811/15823 Other Identifiers: 1969-R-9