OPTICAL 2ND-HARMONIC INVESTIGATIONS OF H-2 AND D-2 ADSORPTION ON SI(100)2X1 - THE SURFACE-TEMPERATURE DEPENDENCE OF THE STICKING COEFFICIENT

Authors
BRATU P KOMPA KL HOFER U
Citation
P. Bratu et al., OPTICAL 2ND-HARMONIC INVESTIGATIONS OF H-2 AND D-2 ADSORPTION ON SI(100)2X1 - THE SURFACE-TEMPERATURE DEPENDENCE OF THE STICKING COEFFICIENT, Chemical physics letters, 251(1-2), 1996, pp. 1-7
Citations number
34
Categorie Soggetti
Physics, Atomic, Molecular & Chemical
Journal title
Chemical physics letters → ACNP
ISSN journal
00092614
Volume
251
Issue
1-2
Year of publication
1996
Pages
1 - 7
Database
ISI
SICI code
0009-2614(1996)251:1-2<1:O2IOHA>2.0.ZU;2-G
Abstract
Optical second-harmonic generation has been used to determine the stic king probability for dissociative adsorption of H-2 and D-2 On Si(100) 2X1 as a function of surface temperature. The initial sticking coeffic ient increases from 10(-8) at 550 K to 10(-5) at 1000 K. It shows an a ctivated behaviour as a function of the surface temperature with an ac tivation energy of 0.70 +/- 0.1 eV for H-2 and 0.75 +/- 0.1 eV for D-2 . The results demonstrate that lattice distortions play a significantl y stronger role in the adsorption process than would be expected solel y from the tilting of Si-Si dimers.