Determination of the Conversion Constant Λ from the Al Kα Lines

Using a bent crystal spectrometer the Al Kα1,2 and α3 lines recorded in the first order of reflexion from quartz have been directly compared with the Cu Kα1 line recorded in the fifth order. The wavelength values of the Al K lines in A units, determined by Edlen and Svensson from Tyren's experimental work, have been used to calculate the conversion constants Λ and Λ*. The weighted mean value of Λ is found to be 1.002047 ± 0.000022 mA/XU and of Λ* 0.999972 ± 0.000022 A/A*.