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Adsorption and Desorption States of Deuterium on Sintered Thin Gold Films

Duś R., Nowicka E.

Polish Journal of Chemistry

2005

Vol. 79 / nr 7

1205-1216

Interaction of atomic deuterium, thermally generated on hot tungsten filament with thin Au polycrystalline film was studied. The surface topography, preferential crystallographic orientation and real area of the films were determined on the basis of AFM, XRD and BET data. The experiments with deuterium were carried out measuring the change of the adsorbent resistance _R during D atoms adsorption under isothermal conditions (78 or 87 K). It has been found that the rate of adsorption occurs according to Eley-Rideal (ER) model. One adsorption state exists, characterized by sticking probability S0 = 0.25 and ER recombination probability _ = 0.22. Measurements of the resistance changes _R of thin gold films with deuterium deposit caused by an increase of temperature were applied to study desorption phenomena. Differentiation of delta R against temperature T in the course of thermal desorption reveals the existance of two desorption states with maxima of desorption rates around 120 and 170 K. We suggest that the first one corresponds to desorption of (D-D) ad-dimers, and the second one to associative desorption due to recombination of D ad-atoms. Thus the adsorption and desorption states of atomic deuterium on thin gold films differ.

Analysis of the High Coverage Complex Desorption Spectra : Application to Hydrogen Desorption from Thin Annealed Gold Film

Stobiński L., Zommer L.

Polish Journal of Chemistry

1999

Vol. 73, nr 8

1373-1378

The analysis of thermal desorption spectra by the Downhill Simplex and the Runge-Kutta methods to solve the Polanyi-Wigner equation has been presented. It is demonstrated for complex thermal desorption spectrum for H adsorbed on a thin gold film at 78 K.

Analysis of simple and single thermal desorption spectra: application to hydrogen (deuterium) desorption from a thin gold film

Zommer L., Stobiński L.

Polish Journal of Chemistry

1999

vol. 73 nr 2

339-346

An effective method of computing kinetic parameters (n,V,Ed) of thermal desorption from the experimental thermal desorption curve has been elaborated. So far the Downhill Simplex Method in Multidimensions for minimization and the Runge-Kutta method for solvation the Polanyi-Wigner equation, for any set of kinetic parameters proposed by the Simplex Method, have been applied. The fitting procedure is demonstrated on examples of low coverage thermal desorption spectra for H (D) adsorbed on a thin gold film surface at 78 K.