ON THE ENERGETIC HETEROGENEITY OF CLEAN EVAPORATED NICKEL FILMS STUDIED BY MEANS OF THE PLACE CHANGE BETWEEN ADSORBED ISOTOPIC CO MOLECULES
The adsorption of C/sup 12/O/sup 16/, C/sup 16/O/sup 16/, and C/sup 12/O/ sup 18/ was used to study the energetic surface heterogeneity of evaporated Ni films. The isotopic gases were adsorbed one after the other and the gas phase was analyzed mass spectrometrically. If the gases were adsorbed at 77 deg K, the equilibrium between gas phase and adsorption phase was obtained between 90 and 195 deg K. The temperature at which the equilibrium is reached is lowest for the molecules adsorbed at high coverages and highest for the molecules adsorbed on the clean film indicating differences in adsorption energies of the film surface concerning the adsorption of CO. If the successive adsorption of the three isotopic gases took place at 273 deg K, no difference in the behavior of the isotopic gases could be observed, indicating that the mobility of the adsorbed molecules is large enough to overshadow the influence of surface heterogeneity. An isotopic exchange between the atoms of the adsorbed molecules could not be observed. (auth)
- Research Organization:
- Technische Hochschule, Hanover
- NSA Number:
- NSA-16-031600
- OSTI ID:
- 4763191
- Journal Information:
- J. Catalysis, Journal Name: J. Catalysis Vol. Vol: 1
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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