NEXAFS MEASUREMENTS INDICATING A TILTED MOLECULAR-ORIENTATION FOR METHYL HALIDES ON GAAS(110)

SURFACE SCIENCE

卷:336

Article

LASKY, PJ ; LU, PH ; YANG, MX ; OSGOOD, RM ; BENT, BE ; STEVENS, PA

关键词: BROMINE;    CHLORINE;    GALLIUM ARSENIDE;    IODINE;    METHYL HALIDES;    NEAR EDGE EXTENDED X-RAY ABSORPTION FINE STRUCTURE (NEXAFS);    SINGLE CRYSTAL SURFACES;    SURFACE STRUCTURE;    THERMAL DESORPTION SPECTROSCOPY;   

DOI  :  10.1016/0039-6028(95)00493-9

来源: Elsevier

【 摘 要 】

The orientation of methyl halides (CH(3)X, X = Cl, Br, I) molecularly adsorbed at 80 K on GaAs(110) has been investigated by near-edge X-ray absorption fine structure (NEXAFS) spectroscopy at the carbon K edge. Analysis of the angular dependence of the C-X sigma(*) resonance indicates that the molecules are oriented with the C-X axis tilted with respect to the surface normal. In the first monolayer, the molecules are inclined in the [0 (1) over bar] direction, the C-X axis approximately 45 degrees from the surface normal. Tn the second monolayer the molecules are inclined in the opposite [01] direction from the surface normal. Correlations between the orientation results obtained from these studies and other observations on these same surface adsorbate systems are discussed.

【 授权许可】

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