Interactions of molecules with surfaces. Progress report, February 1, 1983-January 31, 1984
Technical Report
·
OSTI ID:7149371
Measurements of the rate of desorption of alkali atoms from the surfaces of Si crystals reveal surface phase transitions, a well-known one for the (111) face at 1020 +- 40/sup 0/K and a previously unreported one for Si(100) at 980 +- 20/sup 0/K. The kinetics of the desorption can be interpreted with a model that has a relatively smooth surface above the transition and a less uniform one below. The latter has special sites, such as edges, where the atoms are bound more strongly than they are at the terraces between the edges. Tetramethyldioxetane in excess hydrogen decomposes to two acetone molecules by impact on a surface. The reaction is followed by detecting blue light emitted by electronically excited acetone formed in the collision. The light increases approximately as the cube of the excess of the kinetic energy over a reaction threshold of 50 +- 10 kJ mol/sup -1/. The amount of light varies with the nature of the surface and its temperature. On the eight surfaces tested it is largest for a polymer of perfluorinated ethylene and propylene. A simple model is proposed to account for the compensation effect that is observed when desorption occurs from surfaces that undergo a phase transition. Measurements are reported of the angular distribution of beams of He and Ar diffracted from crystals of LiF.
- Research Organization:
- Brown Univ., Providence, RI (USA)
- DOE Contract Number:
- AC02-78ER04974
- OSTI ID:
- 7149371
- Report Number(s):
- DOE/ER/04974-6; ON: DE84012232
- Country of Publication:
- United States
- Language:
- English
Similar Records
Interactions of molecules with surfaces. Progress report, 1 February 1983-31 January 1984
Interactions of molecules with surfaces. Progress report, 1 February 1982-31 January 1983
Activation of chemical reaction by impact of molecules on a surface. 2. The decomposition of tetramethyldioxetane
Technical Report
·
Sat Dec 31 23:00:00 EST 1983
·
OSTI ID:5377231
Interactions of molecules with surfaces. Progress report, 1 February 1982-31 January 1983
Technical Report
·
Fri Dec 31 23:00:00 EST 1982
·
OSTI ID:6761544
Activation of chemical reaction by impact of molecules on a surface. 2. The decomposition of tetramethyldioxetane
Journal Article
·
Thu Sep 13 00:00:00 EDT 1984
· J. Phys. Chem.; (United States)
·
OSTI ID:6223229
Related Subjects
36 MATERIALS SCIENCE
360600* -- Other Materials
ALKALI METAL COMPOUNDS
ARGON
ATOMIC BEAMS
BEAMS
DESORPTION
ELASTIC SCATTERING
ELEMENTS
FLUIDS
FLUORIDES
FLUORINE COMPOUNDS
GASES
HALIDES
HALOGEN COMPOUNDS
HELIUM
IONIZATION
LITHIUM COMPOUNDS
LITHIUM FLUORIDES
LITHIUM HALIDES
NONMETALS
PHASE TRANSFORMATIONS
RARE GASES
RESEARCH PROGRAMS
SCATTERING
SEMIMETALS
SILICON
SORPTIVE PROPERTIES
SURFACE PROPERTIES
SURFACES
360600* -- Other Materials
ALKALI METAL COMPOUNDS
ARGON
ATOMIC BEAMS
BEAMS
DESORPTION
ELASTIC SCATTERING
ELEMENTS
FLUIDS
FLUORIDES
FLUORINE COMPOUNDS
GASES
HALIDES
HALOGEN COMPOUNDS
HELIUM
IONIZATION
LITHIUM COMPOUNDS
LITHIUM FLUORIDES
LITHIUM HALIDES
NONMETALS
PHASE TRANSFORMATIONS
RARE GASES
RESEARCH PROGRAMS
SCATTERING
SEMIMETALS
SILICON
SORPTIVE PROPERTIES
SURFACE PROPERTIES
SURFACES