Adsorption/desorption kinetics of H2O on GaAs(100) measured by photoreflectance

C. R. Carlson, W. F. Buechter, F. Che-Ibrahim, E. G. Seebauer

Research output: Contribution to journalArticlepeer-review


The mechanism of H2O adsorption on GaAs(100) has been elucidated by an adaptation of the photoreflectance (PR) technique for surface kinetic measurements. Being an optical method, PR is especially well-suited for probing weakly bonded adsorption systems where the pressures required for significant interaction (> 10-5 Torr) preclude the use of traditional electron or ion spectroscopies. H2O adsorbs through a physisorbed state. This species can desorb or react to a chemisorbed form, which in turn can desorb. Both the physisorbed and chemisorbed species are undissociated. We interpret exceptionally low values for the prefactors associated with the chemisorbed state in terms of an adsorbate-induced surface reconstruction.

Original languageEnglish (US)
Pages (from-to)7190-7197
Number of pages8
JournalThe Journal of Chemical Physics
Issue number9
StatePublished - 1993

ASJC Scopus subject areas

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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