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absorption edge ANOMALOUS DISPERSION artificial face atomic planes beam emerges beam entering Bergen Davis bevelled face blackened regions Bragg calcium atom cleavage face cleaved along CD continuous spectrum Crystal F crystal was cleaved crystals were prepared determine the wave-length deviation angle deviation of ray DISPERSION OF X-RAYS edge of calcium effective atomic electrons entering the crystal Face Fig G. A. Lindsay group HONL Honl's theoretical curve index of refraction J. A. Bearden known emission line large angle LENGTH AGED X.U. longer wave-lengths measured Michigan millimeters Number of Number obtained oscillator strength Phys PHYSICAL REVIEW Plate taken plates Wave polished position of ray R. M. WHITMER radiation reflected as ray refracted and reference refracted appreciably refracted component Refracted Wave-Length refraction of calcite separation sharp short wave side shorter wave-length Siegbahn slit small wave-length intervals spectrometer sufficiently small angle value of 5/X2 visible light wave-length range white line X-RAYS IN CALCITE