Phys. Rev. B 49, 14070–14073 (1994)Kinetics of oxygen dissociation on Si(111)7×7 investigated with optical second-harmonic generation
Optical second-harmonic generation is used as a sensitive, nondestructive probe for the thermally activated dissociation of molecular oxygen on Si(111)7×7. Isothermal measurements show that the dissociation kinetics strongly depend on the total oxygen coverage. At room temperature the 1/e lifetime of chemisorbed O2 is ∼15 min for saturation coverage but ∼50 min for low oxygen coverage. The temperature dependence of the dissociation rates between 80 and 500 K indicates that more than one dissociation channel and/or molecular oxygen species exist on the surface. © 1994 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.49.14070
DOI:
10.1103/PhysRevB.49.14070
PACS:
68.35.-p, 42.65.Ky, 82.65.My
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