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Fine Structure Measurements in the Energy Angular Distribution of Secondary Electrons from a (110) Face of Copper
Author(s) -
Appelt G.
Publication year - 1968
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.19680270223
Subject(s) - maxima , reciprocal lattice , electron , copper , lattice constant , excited state , refractive index , lattice (music) , azimuth , physics , atomic physics , optics , materials science , quantum mechanics , diffraction , art , performance art , acoustics , art history , metallurgy
The energy angular distribution of secondary electrons from a (110) face of copper in the (010) azimuth is measured by means of a dynamical method. The plots exhibit numerous fine structure maxima. It can be shown that the maxima corresponding to all theoretically possible directions of reciprocal lattice vectors up to the 46th order may be found in every measurement; taking the whole results, maxima corresponding to directions of reciprocal lattice vectors up to the 148th order may be detected continuously. The correlation of the maxima to the crystal structure yields experimental values of the refractive index which depends on the energy of the secondary but is independent of the energy of the primary electrons. By means of this refractive index it is possible to determine the energy band of excited states above the vacuum level in the (010) direction of the wave vector, except an integration constant.