MOLECULAR VIBRATION DYNAMICS IN MOLECULE SURFACE INTERACTIONS

被引:46
作者
BRENIG, W [1 ]
KUCHENHOFF, S [1 ]
KASAI, H [1 ]
机构
[1] OSAKA UNIV,DEPT APPL PHYS,OSAKA,JAPAN
来源
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING | 1990年 / 51卷 / 02期
关键词
68.35; 82.20F;
D O I
10.1007/BF00324273
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
A quantum mechanical coupled channels approach to associative or recombinative desorption and scattering of diatomic molecules is described. The formulation is based on the concept of a reaction path and allows prediction of the vibrational excitation of desorbing molecules. We first consider very light molecules such as H2 and D2 desorbing via a Langmuir-Hinshelwood reaction. In a simple model neglecting rotations and substrate vibrations, the dependence of molecular vibrational excitation on incident energy, the curvature of the reaction path and the position and height of the saddle point are discussed. Various experimental results can be described with reasonable parameters. Vibrational excitation in Eley-Rideal reactions and rotational excitations in general are discussed only in a semiquantitative way. For heavier molecules the coupling to substrate vibrations in principle will become more important. Arguments will be presented that for the problem of vibrational excitation in desorption and scattering this coupling may still be neglected approximately. Results for vibrational excitations of CuF desorbing from Cu are in support of this simple point of view. © 1990 Springer-Verlag.
引用
收藏
页码:115 / 120
页数:6
相关论文
共 30 条
[1]   ADSORPTION AND DESORPTION-KINETICS IN THE SYSTEMS H-2/CU(111), H-2/CU(110) AND H-2/CU(100) [J].
ANGER, G ;
WINKLER, A ;
RENDULIC, KD .
SURFACE SCIENCE, 1989, 220 (01) :1-17
[2]   VIBRATIONAL-MODES OF HYDROGEN ADSORBED ON PT(111) - ADSORPTION SITE AND EXCITATION MECHANISM [J].
BARO, AM ;
IBACH, H ;
BRUCHMANN, HD .
SURFACE SCIENCE, 1979, 88 (2-3) :384-398
[3]   VIBRATION TRANSITIONS INDUCED BY A CHEMICAL-REACTION - QUANTUM MODEL FOR STRONG COUPLING REGION [J].
BASILEVSKY, MV .
MOLECULAR PHYSICS, 1974, 28 (03) :617-632
[4]   COUPLED CHANNEL PROBLEMS WITH MORSE POTENTIALS - A SIMPLE AND FAST METHOD [J].
BRENIG, W ;
KASAI, H ;
MULLER, H .
SURFACE SCIENCE, 1985, 161 (2-3) :608-626
[5]   QUANTUM EFFECTS IN EXCITATION-SPECTRA OF DESORBING HYDROGEN MOLECULES [J].
BRENIG, W ;
KASAI, H .
SURFACE SCIENCE, 1989, 213 (01) :170-186
[6]   MUTUAL INFLUENCE OF ROTATIONAL AND VIBRATIONAL-ENERGY TRANSFER OF MOLECULES AT SURFACES [J].
BRUNNER, T ;
BRAKO, R ;
BRENIG, W .
PHYSICAL REVIEW A, 1987, 35 (12) :5266-5269
[7]   ELECTRONIC DAMPING OF HYDROGEN VIBRATION ON THE W (100) SURFACE [J].
CHABAL, YJ .
PHYSICAL REVIEW LETTERS, 1985, 55 (08) :845-848
[8]   VIBRATIONAL HEATING OF CUF DESORBING FROM DEFINED COPPER SURFACES IN REACTIONS WITH MOLECULAR OR ATOMIC FLUORINE [J].
CHEN, XR ;
WAGEMANN, K ;
WANNER, J ;
BRENIG, W ;
KUCHENHOFF, S .
SURFACE SCIENCE, 1989, 224 (1-3) :570-580
[9]   OBSERVATION OF EXCEPTIONALLY HIGH VIBRATIONAL-EXCITATION OF HYDROGEN MOLECULES FORMED BY WALL RECOMBINATION [J].
EENSHUISTRA, PJ ;
BONNIE, JHM ;
LOS, J ;
HOPMAN, HJ .
PHYSICAL REVIEW LETTERS, 1988, 60 (04) :341-344
[10]   THEORY OF TRANSLATIONAL-VIBRATIONAL ENERGY-TRANSFER FOR REACTIVE COLLISIONS [J].
FISCHER, SF ;
RATNER, MA .
JOURNAL OF CHEMICAL PHYSICS, 1972, 57 (07) :2769-+