705 K
14 pp.
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TitleInternal Energy Dependence of Molecular Condensation Coefficients Determined from Molecular Beam Surface Scattering Experiments
Author(s)Sibener, S. J.; Lee, Y. T.
Publication DateMay 1978
Report NumberLBL-7395
Unique IdentifierACC0286
Other NumbersCONF-780728-3; OSTI ID: 6403272
Research OrgLawrence Berkeley Laboratory, University of California, Berkeley, CA (USA)
Contract NoW-7405-ENG-48
Sponsoring OrgUS Department of Energy (DOE)
Other Information11th Symposium on Rarefied Gas Dynamics; 3 Jul 1978; Cannes, France
Subject640301 -- Atomic, Molecular & Chemical Physics -- Beams & their Reactions; Carbon Tetrachloride -- Collisions; Carbon Tetrachloride -- Molecule Collisions; Angular Distribution; Energy Dependence; Molecular Beams; Probability; Reflection; Surfaces
KeywordsBeams; Chlorinated Aliphatic Hydrocarbons; Collisions; Distribution; Halogenated Aliphatic Hydrocarbons; Organic Chlorine Compounds; Organic Compounds; Organic Halogen Compounds; Sticking Probability, Reflection Intensity, Angular Distribution
Related Web PagesYuan T. Lee and Molecular Beam Studies
AbstractAn experiment was performed which confirms the existence of an internal mode dependence of molecular sticking probabilities for collisions of molecules with a cold surface. The scattering of a velocity selected effusive beam of CCl{sub 4} from a 90 K CC1{sub 4} ice surface has been studied at five translational velocities and for two different internal temperatures. At a surface temperature of 90 K (approx. 99% sticking probability) a four fold increase in reflected intensity was observed for the internally excited (560 K) CC1{sub 4} relative to the room temperature (298 K) CC1{sub 4} at a translational velocity of 2.5 X 10{sup 4} cm/sec. For a surface temperature of 90 K all angular distributions were found to peak 15{sup 0} superspecularly independent of incident velocity.
705 K
14 pp.
View Document 

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