ADSORPTION-DESORPTION KINETICS OF H2O ON GAAS(100) MEASURED BY PHOTOREFLECTANCE

被引：15

作者：

CARLSON, CR ^{[1
]}

BUECHTER, WF ^{[1
]}

CHEIBRAHIM, F ^{[1
]}

SEEBAUER, EG ^{[1
]}

机构：

[1] UNIV ILLINOIS,DEPT CHEM ENGN,URBANA,IL 61801

来源：

JOURNAL OF CHEMICAL PHYSICS | 1993年 / 99卷 / 09期

关键词：

D O I：

10.1063/1.465435

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

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.

引用

页码：7190 / 7197

页数：8

共 25 条

[11] STUDY OF SI(111) SURFACES BY OPTICAL 2ND-HARMONIC GENERATION - RECONSTRUCTION AND SURFACE PHASE-TRANSFORMATION [J].