Abstract
For a spectrum obtained using a beryllium filter detector spectrometer it is shown that the difference between the observed band maximum and the true transition frequency ( Delta ) is an energy-dependent quantity. A method for calculating Delta is presented and it is shown that for any particular monochromator plane the value of Delta varies rapidly for low values of 2 theta . At larger values of 2 theta , Delta approaches a value of 24.5 cm-1 asymptotically.

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