The internal and translational energy dependence of molecular condensation coefficients: SF[sub 6] and CCl[sub 4]
- Department of Chemistry, University of California, and Chemical Sciences Division, Lawrence Berkeley Laboratory, Berkeley, California 94720 (United States)
In this paper we describe a series of beam--surface scattering experiments which examine the internal and translational energy dependence of the molecular condensation probabilities for CCl[sub 4] or SF[sub 6] colliding with their respective condensed phases. It has been conclusively shown that thermal excitation of a polyatomic molecule's rotational and vibrational degrees of freedom can inhibit its probability of sticking upon impact with a cryogenically cooled surface. This effect is most pronounced in the limit of low incident kinetic energy, and essentially vanishes at higher velocities. As part of these experiments, we have also obtained the angular and velocity distributions for reflected SF[sub 6] and Kr which have been used to examine the energy and momentum exchange of these gases with their respective condensed phases. Our findings suggest that heterogeneous laser isotope separation schemes based on precollision molecular excitation may warrant further investigation.
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 7283041
- Journal Information:
- Journal of Chemical Physics; (United States), Vol. 101:2; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
Similar Records
Total cross sections for electron scattering by polyatomic molecules at 10--1000 eV: H{sub 2}S, SiH{sub 4}, CH{sub 4}, CF{sub 4}, CCl{sub 4}, SF{sub 6}, C{sub 2}H{sub 4}, CCl{sub 3}F, CClF{sub 3}, and CCl{sub 2}F{sub 2}
Crossed beam reactive scattering of oxygen atoms and surface scattering studies of gaseous condensation
Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CARBON TETRACHLORIDE
SCATTERING
VAPOR CONDENSATION
SULFUR FLUORIDES
SURFACES
MOLECULE COLLISIONS
ADHESION
ENERGY DEPENDENCE
EXCITATION
KINETIC ENERGY
KRYPTON
MOLECULAR BEAMS
MOMENTUM TRANSFER
POLYATOMIC MOLECULES
PROBABILITY
ROTATIONAL STATES
TEMPERATURE DEPENDENCE
VIBRATIONAL STATES
BEAMS
CHLORINATED ALIPHATIC HYDROCARBONS
COLLISIONS
ELEMENTS
ENERGY
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
FLUIDS
FLUORIDES
FLUORINE COMPOUNDS
GASES
HALIDES
HALOGEN COMPOUNDS
HALOGENATED ALIPHATIC HYDROCARBONS
MOLECULES
NONMETALS
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
RARE GASES
SULFUR COMPOUNDS
665300* - Interactions Between Beams & Condensed Matter- (1992-)