Abstract
A novel method of measuring absolute x-ray wavelengths using simultaneous Bragg reflections at two parallel crystal plates of equal atomic spacing is presented. The accuracy of wavelength determination Δλ/λ for this method is discussed and a value of 5 × 10 −5 is achieved. Absolute wavelengths of L-shell laser-produced spectra of Cu, Ge, As, and Se and M-shell spectra of Gd and Tb have been measured in the wavelength region 7.5–8.5 Å using a quartz (101̄0) quasimonolithic crystal blank.
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