ISOTHERMAL DESORPTION OF HYDROGEN FROM POLYCRYSTALLINE DIAMOND FILMS

Authors
KOLESKE DD GATES SM THOMS BD RUSSELL JN BUTLER JE
Citation
Dd. Koleske et al., ISOTHERMAL DESORPTION OF HYDROGEN FROM POLYCRYSTALLINE DIAMOND FILMS, Surface science, 320(3), 1994, pp. 120000105-120000111
Citations number
53
Categorie Soggetti
Chemistry Physical
Journal title
Surface science → ACNP
ISSN journal
00396028
Volume
320
Issue
3
Year of publication
1994
Pages
120000105 - 120000111
Database
ISI
SICI code
0039-6028(1994)320:3<120000105:IDOHFP>2.0.ZU;2-N
Abstract
The kinetics of isothermal H-2 desorption from polycrystalline diamond are studied in real time. The surface H coverage (theta(H)) is measur ed by mass analyzing the recoiled H+ ion signal during the desorption. We find that the H-2 desorption is Ist order in theta(H) with an acti vation energy of 69 +/- 6 kcal/mol and a prefactor of 10(10.5+/- 0.9) s(-1). We suggest that formation of a C-C pi-bond on the clean surface plays a key role in H-2 desorption from diamond, a view consistent wi th previous theoretical calculations of H-2 desorption from diamond.