ON THE DAMPING OF COHERENCE IN THE SMALL-ANGLE INELASTIC-SCATTERING OF HIGH-ENERGY ELECTRONS BY CRYSTALS

被引:9
作者
DUDAREV, SL [1 ]
PENG, LM [1 ]
WHELAN, MJ [1 ]
机构
[1] MOSCOW ENGN PHYS INST,DEPT THEORET PHYS,MOSCOW 115409,USSR
关键词
D O I
10.1016/0375-9601(92)90783-I
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We study the effect of small-angle inelastic scattering on the propagation of high-energy electrons through crystals. Numerical integration of the kinetic equation for the density matrix shows that electron-electron inelastic collisions lead to the damping of the off-diagonal elements of the density matrix describing the coherence between the states of an electron on different branches of the dispersion surface. The attenuation distance is found to be comparable with the inelastic mean free path for excitation of the electron subsystem of the crystal. Our results demonstrate that in many cases the transition from dependent to independent Bloch wave model takes place far more rapidly than it was commonly assumed earlier.
引用
收藏
页码:111 / 115
页数:5
相关论文
共 24 条
[1]   ATOMIC-STRUCTURE IMAGES FORMED BY PLASMA-LOSS ELECTRONS [J].
AJIKA, N ;
HASHIMOTO, H ;
YAMAGUCHI, K ;
ENDOH, H .
JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS, 1985, 24 (01) :L41-L44
[2]   CONTRAST IN THE ELECTRON SPECTROSCOPIC IMAGING MODE OF A TEM .3. BRAGG CONTRAST OF CRYSTALLINE SPECIMENS [J].
BAKENFELDER, A ;
FROMM, I ;
REIMER, L ;
RENNEKAMP, R .
JOURNAL OF MICROSCOPY-OXFORD, 1990, 159 :161-177
[3]  
CHERNS D, 1973, Z NATURFORSCH A, VA 28, P565
[4]   ELECTRON-MICROSCOPY OF CRYSTALS WITH TIME-DEPENDENT PERTURBATIONS [J].
COWLEY, JM .
ACTA CRYSTALLOGRAPHICA SECTION A, 1988, 44 :847-853
[5]   IMAGING OF DISLOCATIONS USING BACKSCATTERED ELECTRONS IN A SCANNING ELECTRON-MICROSCOPE [J].
CZERNUSZKA, JT ;
LONG, NJ ;
BOYES, ED ;
HIRSCH, PB .
PHILOSOPHICAL MAGAZINE LETTERS, 1990, 62 (04) :227-232
[6]   COHERENCE OF INELASTICALLY SCATTERED FAST ELECTRONS IN CRYSTALS OF FINITE THICKNESS [J].
DONIACH, S ;
SOMMERS, C .
PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES, 1985, 51 (03) :419-427
[7]   CONVERGENT-BEAM DIFFRACTION .1. INTRODUCTION [J].
EADES, JA .
JOURNAL OF ELECTRON MICROSCOPY TECHNIQUE, 1989, 13 (01) :1-2
[8]   INELASTIC-SCATTERING AND ENERGY FILTERING IN TRANSMISSION ELECTRON-MICROSCOPE [J].
EGERTON, RF .
PHILOSOPHICAL MAGAZINE, 1976, 34 (01) :49-65
[9]   INCIDENT BEAM DIFFRACTION EFFECTS IN AUGER-ELECTRON EMISSION FROM CRYSTAL-SURFACES [J].
GOMOYUNOVA, MV ;
DUDAREV, SL ;
PRONIN, II .
SURFACE SCIENCE, 1990, 235 (2-3) :156-168
[10]   EXPERIMENTAL PROOF OF THE DEPENDENT BLOCH WAVE MODEL BY LARGE-ANGLE ELECTRON-SCATTERING FROM THIN-CRYSTALS [J].
HAGEMANN, P ;
REIMER, L .
PHILOSOPHICAL MAGAZINE A-PHYSICS OF CONDENSED MATTER STRUCTURE DEFECTS AND MECHANICAL PROPERTIES, 1979, 40 (03) :367-375