Accession Number : AD0642408

Title :   INTERACTIONS OF ACTIVATED GASES WITH SOLIDS.

Descriptive Note : Final scientific rept., 1 Oct 61-Jun 66,

Corporate Author : WASHINGTON STATE UNIV PULLMAN DEPT OF PHYSICS

Personal Author(s) : Donaldson,Edward E.

Report Date : 18 NOV 1966

Pagination or Media Count : 9

Abstract : In investigations of the adsorption of nitrogen on solid surfaces, it was shown that when nitrogen molecules are either bombarded by electrons or when they encounter an incandescent metal surface, atoms of nitrogen may be produced which sorb much more readily than the parent molecule. Thus the activated state was shown to be atomic. Burial of argon ions in nickel was studied. It was learned that the sticking probability for these ions depends upon whether the nickel surface is in a cold-worked or an annealed condition (highest sticking probability in the case of cold-worked nickel). This suggests that either grain boundaries or dislocations may provide sites for adsorption but neither possibility can yet be eliminated. Desorption by photons, electrons and ions was observed. Photon and electron bombardment desorption studies demonstrated that desorption occurs by way of an intermediate activated surface state while ion bombardment desorption was observed only as a secondary process in ion burial studies. Desorption by thermal means permitted the determination of energy with which ions are bound in the metal. (Author)

Descriptors :   (*ADSORPTION, GASES), (*PARTICLE BEAMS, ADSORPTION), EXCITATION, SOLIDS, NITROGEN, ELECTRON IRRADIATION, SORPTION, ATOMIC ENERGY LEVELS, ARGON, IONS, NICKEL, MICROSTRUCTURE, PHOTONS, ION BOMBARDMENT, HEATING, LEAKAGE(ELECTRICAL), ELECTRODES

Subject Categories : Electricity and Magnetism
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE