Abstract
Coherent brernsstrahlung (CB) is the result of inelastic Bragg scattering of electrons of a few hundreds of kev, a collective elfect of trie whole crystal. In an electron microscope it is theoretically possible to deterrnine trie row of atoms where the electron was inelastically scattered. These staternents are contradictory. Optical path calculations are made for 160 kev electrons inelastically scattered by a silicon [Ill] crystal and the results are compared with rneasured CB spectra. The results can be understood by application of Van Kampen's theory of quantum mechanical measurement. Experimental CB spectra tum out to be the result of coherent scattering of atoms within the same row, and incoherent summation of intensitie8 from dilferent rows, or, in other words, the electrons that cause CB are locabsed within atomic rows.
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