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Approximations to the Systematic Many‐Beam Case of High‐Energy Electron Diffraction. II. Improved Three‐Beam and Four‐Beam Solutions and Extinction Data
Author(s) -
Kästner G.
Publication year - 1988
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221460103
Subject(s) - beam (structure) , diffraction , extinction (optical mineralogy) , physics , beam diameter , optics , voltage , cathode ray , electron , atomic physics , quantum mechanics , laser beams , laser
Kinematical many‐beam corrections to the dynamical three‐beam and four‐beam approximations are derived analytically. The solutions yield refined extinction lengths and Bloch‐wave excitation coefficients tabulated for a variety of crystals and accelerating voltages (100 kV to 1 MV). Moreover, the results are used to analyse three‐beam and four‐beam features of electron transmission and anomalous absorption, and to represent many‐beam influences to critical‐voltage effects.