New experimental results are reported for type B coherent bremmstrahlung (CB) radiation from kilovolt electrons traversing thin crystals in zone axis orientations, obtained using an electron microscope and energy dispersive X-ray detector, approximately at right angles to the beam. These results are interpreted using the three-dimensional Bloch wave theory of multiple coherent electron scattering, which predicts coherent bremsstrahlung ('weak-beam radiation'), channeling radiation ('Pendelloesung radiation') and combinations thereof. Absent CB peaks are observed from the Laue zones in which all structure factors are zero. Doppler broadening is found to make the observation of channeling radiation satellites on CB peaks difficult. Closed-form expressions for 'resonant' CB are given.
|Original language||English (US)|
|Number of pages||20|
|Journal||Philosophical Magazine A: Physics of Condensed Matter, Structure, Defects and Mechanical Properties|
|Publication status||Published - May 1984|