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Author Schumacher, H. ♦ Bernstein, R. B. ♦ Rothe, E. W.
Sponsorship USDOE
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ AMMONIA ♦ ANGULAR DISTRIBUTION ♦ ARGON ♦ BEAMS ♦ CESIUM CHLORIDES ♦ CHLORINATED HYDROCARBONS ♦ CROSS SECTIONS ♦ DIPOLES ♦ ELECTRIC POTENTIAL ♦ FLUORINATED HYDROCARBONS ♦ GASES ♦ INTERACTIONS ♦ MEASURED VALUES ♦ METHANE ♦ MOLECULES ♦ NITROGEN OXIDES ♦ RESOLUTION ♦ SCATTERING ♦ SULFUR COMPOUNDS ♦ TEMPERATURE ♦ VELOCITY
Abstract Total cross sections (Q) for the interaction of beams of CsC1 with a number of molecules were measured using an apparatus of ca 4' angular resolution in which the temperature of the scattering gas could be varied from 200 to 735 deg K. The temperature dependence of Q was studied for Ar, CH/sub 4/, CH/sub 2/F/ sub 2/, CHF/sub 3/, CF/sub 4/, NO, H/sub 2/S, NH/s ub 3/, and for cis- snd trans- CHC1 = CHC1. Relative values of Q at 300 deg K were measured for eight additional Bases. The data were correlated using the Massey-Mohr theory, assuming an intermolecular potential V(r) = - C/r/sup 6/, so that Q = b(C/v/sub r/ )/sub 2/3/, where v/sub r/ is the relative velocity and b a known constant; the pctential constant C was estimated from formulas for the dispersion, dipole- induced dipole, and dipole-dipole forces. For the nonpolar gases the observed small temperature dependence of Q agrees within experimental error ( plus or minus 3%) with that expected from the temperature dependence of v/sub r/. The theoretical values of Q differ by a nearly constant factor from the experimental results; thus relative cross sections are predicted with fair accuracy. For the polar gases the Q's are large, decreasing significantly with increasing temperature. Because of the lange dipole-dipole interaction, the approximate theoretical treatment (based on the limiting temperature-dependent dipole-dipole contribution to (C) accounts only semiquantitatively for the observatfons. (auth)
ISSN 00219606
Educational Use Research
Learning Resource Type Article
Publisher Date 1960-08-01
Publisher Department Univ. of Michigan, Ann Arbor
Journal Journal of Chemical Physics
Volume Number 33
Organization Univ. of Michigan, Ann Arbor


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