TY - JOUR
T1 - The combined effect of acceleration voltage and incident beam orientation on the characteristic X-ray production in thin crystals
AU - Krishnan, Kannan M.
AU - Rez, Peter
AU - Thomas, Gareth
AU - Yokota, Yasuhiro
AU - Hashimoto, H.
N1 - Funding Information:
The authors would like to thank Drs. T. Bielicki and A. Fox for a critical reading of the manuscript. This work was supported by the Director, Office of Energy Research, Office of Basic Energy Sciences, Materials Sciences Division, U.S. Department of Energy, under Contract DE-AC03-76SF00098.
PY - 1986/4
Y1 - 1986/4
N2 - A systematic experimental study has been carried out to determine the combined effect of acceleration voltage and incident beam orientation on the characteristic X-ray production in thin crystals. For MgAl2O4it has been shown that the orientation dependence undergoes a reversal in character above a particular voltage, which is referred to now as the ‘inversion’ voltage. This inversion voltage has been experimentally determined to be -270kV for MgAl2O4compounds with a spinel structure and is in agreement with theoretical predictions based on a highly localized scattering model for characteristic X-ray production in thin crystals. Further, in combination with theoretical calculations, this ‘inversion voltage’ behaviour has been shown to be different from the conventional critical voltage effect. From the microanalysis point of view, it has been experimentally shown that in order to obtain an analysis independent of the incident beam orientation or the acceleration voltage, it is essential to systematically tilt the crystal to an orientation at which no lower-order Bragg reflections are excited.
AB - A systematic experimental study has been carried out to determine the combined effect of acceleration voltage and incident beam orientation on the characteristic X-ray production in thin crystals. For MgAl2O4it has been shown that the orientation dependence undergoes a reversal in character above a particular voltage, which is referred to now as the ‘inversion’ voltage. This inversion voltage has been experimentally determined to be -270kV for MgAl2O4compounds with a spinel structure and is in agreement with theoretical predictions based on a highly localized scattering model for characteristic X-ray production in thin crystals. Further, in combination with theoretical calculations, this ‘inversion voltage’ behaviour has been shown to be different from the conventional critical voltage effect. From the microanalysis point of view, it has been experimentally shown that in order to obtain an analysis independent of the incident beam orientation or the acceleration voltage, it is essential to systematically tilt the crystal to an orientation at which no lower-order Bragg reflections are excited.
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U2 - 10.1080/01418638608244292
DO - 10.1080/01418638608244292
M3 - Article
AN - SCOPUS:0022698292
SN - 1364-2812
VL - 53
SP - 339
EP - 348
JO - Philosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties
JF - Philosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties
IS - 4
ER -