CHEMICAL REACTIONS ON CLEAN SURFACES, USING MODULATED ATOMIC BEAM TECHNIQUES.
Final technical summary rept. 1 Apr 65-31 Mar 68,
GULF GENERAL ATOMIC INC SAN DIEGO CALIF
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The hydrogen-deuterium exchange reaction on nickel has been studied using modulated molecular beam techniques. When coupled with a surface preparation technique that allows one to grow clean single crystals during the experiment, the molecular beam techniques permit one to show that the scattering of all the isotopic molecular hydrogenic species is specularly directed, while the product of the chemical reaction is scattered according to a modified cos Tr law. The proposal to use varying rates of continuous deposition of metal to control the surface concentrations of the adsorbed species was shown to be inapplicable to the H2-D2 exchange, as the measured background gas pressure dependence was unaffected by this deposition. This pressure dependence was also shown to vary with background gas pressure. From the scattering data at the higher pressure it appears that both the reactants must be adsorbed prior to the formation of the product HD. Author
- Physical Chemistry