✦ LIBER ✦
Surface diffusion of hydrogen on Pt(111): laser-induced thermal desorption studies
✍ Scribed by E.G. Seebauer; L.D. Schmidt
- Publisher
- Elsevier Science
- Year
- 1986
- Tongue
- English
- Weight
- 545 KB
- Volume
- 123
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Surface diffusion of deuterium and hydrogen on Pt(ll1) has been investigated by laser-induced thermal desorption. As the initial surface coverage of deuterium is varied from 0.001 to 0.33, the diffusional activation energy falls from 12 to 7 kcal/mol, and the pre-exponential factor falls from 3 x lo4 to 0.5 cm*/s. Concentration profiles measured directly by a variable aperture technique confirm that at 234 K deuterium diffusion slows at low coverage. Hydrogen diffuses about twice as fast as deuterium.