Accession Number : AD0688617

Title :   CHEMICAL REACTIONS USING MODULATED ATOMIC BEAM TECHNIQUES.

Descriptive Note : Final rept., 1 Apr 68-31 Mar 69,

Corporate Author : GULF GENERAL ATOMIC INC SAN DIEGO CALIF

Personal Author(s) : Smith,J. N. , Jr

Report Date : 14 APR 1969

Pagination or Media Count : 81

Abstract : The hydrogen-deuterium exchange reaction on nickel was studied using modulated molecular beam techniques. When coupled with a surface preparation technique that allows one to grow clean single crystals in situ during the experiment, it is shown that the scattering of H2, D2, and HD is specularly directed while the product of the H2/D2 exchange is scattered. The reaction probability implies the importance of the normal component of momentum in controlling the reaction rate. From these data and from earlier studies of the pressure dependence of the reaction the Langmuir type of mechanism is favored over a direct collisional (Rideal) type of mechanism in the exchange reaction H2 + D2 yielding 2HD. Further, it is apparent from the data that the role played by sorbed H2 is important in such reactions on Ni surfaces. (Author)

Descriptors :   (*NICKEL, SURFACE PROPERTIES), (*EXCHANGE REACTIONS, *HYDROGEN), (*MOLECULAR BEAMS, CHEMICAL REACTIONS), MOLECULAR BEAMS, DEUTERIUM, SCATTERING, ADSORPTION

Subject Categories : Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE