VIBRATION-MEDIATED UV PHOTODESORPTION - AMMONIA ON GAAS

被引：67

作者：

ZHU, XY

WHITE, JM

机构：

[1] Department of Chemistry and Biochemistry, Center for Materials Chemistry, University of Texas, Austin

来源：

PHYSICAL REVIEW LETTERS | 1992年 / 68卷 / 22期

关键词：

D O I：

10.1103/PhysRevLett.68.3359

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

A surprisingly large isotope effect is observed in nonthermal uv photodesorption of ammonia from GaAs(100). The cross section for NH3 photodesorption is 4 times larger than for ND3, a fact which cannot be explained using existing photodesorption models, e.g., the conventional Menzel-Gomer-Redhead model. We take this as the first evidence for uv-driven photodesorption from electronically quenched, vibrationally excited ground-state adsorbates.

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页码：3359 / 3362

页数：4

相关论文

共 19 条

[1] MODEL FOR ELECTRON-STIMULATED AND PHOTON-STIMULATED DESORPTION [J].

ANTONIEWICZ, PR .

PHYSICAL REVIEW B, 1980, 21 (09) :3811-3815

[2]

AVOURIS P, 1989, ANNU REV PHYS CHEM, V40, P173

[3] LASER-INDUCED GAS-SURFACE INTERACTIONS [J].

Chuang, T. J. .

SURFACE SCIENCE REPORTS, 1983, 3 (01) :1-105

[4] INFRARED PHOTODESORPTION - VIBRATIONAL-EXCITATION AND ENERGY-TRANSFER PROCESSES ON SURFACES [J].

CHUANG, TJ ;

SEKI, H ;

HUSSLA, I .

SURFACE SCIENCE, 1985, 158 (1-3) :525-552

[5] THEORY OF LASER-SIMULATED SURFACE PROCESSES [J].

GEORGE, TF ;

LIN, J ;

BERI, AC ;

MURPHY, WC .

PROGRESS IN SURFACE SCIENCE, 1984, 16 (02) :139-274

[6] PHOTODESORPTION BY RESONANT LASER-VIBRATIONAL COUPLING - EFFECTS OF COHERENT 2-QUANTUM TRANSITIONS, VIBRATIONAL ANHARMONICITY, AND SURFACE HETEROGENEITY ON YIELDS [J].

GORTEL, ZW ;

PIERCY, P ;

TESHIMA, R ;

KREUZER, HJ .

PHYSICAL REVIEW B, 1987, 36 (06) :3059-3073

[7] VIBRATIONAL PREDESORPTION [J].

HEIDBERG, J ;

STEIN, H ;

RIEHL, E ;

SZILAGYI, Z ;

WEISS, H .

SURFACE SCIENCE, 1985, 158 (1-3) :553-578

[8] DEUTERIUM-ISOTOPE EFFECT IN ELECTRON-IMPACT DESORPTION OF HYDROGEN ON TUNGSTEN [J].

JELEND, W ;

MENZEL, D .

CHEMICAL PHYSICS LETTERS, 1973, 21 (01) :178-180

[9]

JO SK, IN PRESS P ANN S AM

[10] NH3 ADSORPTION ON NI(110) AND THE PRODUCTION OF THE NH2 SPECIES BY ELECTRON-IRRADIATION [J].

KLAUBER, C ;

ALVEY, MD ;

YATES, JT .

SURFACE SCIENCE, 1985, 154 (01) :139-167