PHOTODESORPTION OF NH3 FROM GAAS - A RESONANCE-ENHANCED MULTIPHOTON IONIZATION STUDY

被引：18

作者：

ZHU, XY ^{[1
]}

WHITE, JM ^{[1
]}

JUNKER, KH ^{[1
]}

机构：

[1] UNIV TEXAS, DEPT CHEM & BIOCHEM, AUSTIN, TX 78712 USA

来源：

CHEMICAL PHYSICS LETTERS | 1994年 / 226卷 / 1-2期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0009-2614(94)00710-1

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 photodesorption of NH3 from GaAs (100) at 193 nm has been characterized using 2 + 1 resonance-enhanced multiphoton ionization (REMPI) spectroscopy via the intermediate B state. The final state distribution of photodesorbed NH3 is nonthermal: the translational and rotational distributions can be approximated by Boltzmann temperatures of T(max) = 300 +/- 30 and T(rot) = 350 +/- 50 K, respectively, with a relative population of 6% +/- 2% in the nu2 = 1 vibrational level (or T(vib) = 490 +/- 60 K). Possible energy transfer mechanisms responsible for desorption are discussed.

引用

页码：121 / 126

页数：6

共 25 条

[1]

Ashfold M. N. R., 1987, Comments on Atomic and Molecular Physics, V19, P181

[2] THE B-1E'' STATE OF AMMONIA - SUB-DOPPLER SPECTROSCOPY AT VACUUM ULTRAVIOLET ENERGIES [J].