Abstract
Many workers adjust the sensitivity of their spectrometers so that the signal transmitted by a crystal under investigation is set to a baseline of 100% in a region where the crystal is known to be non-absorbing, then calculate the absorption coefficient alpha using the approximate relation alpha =t-1 ln(Ib/It) where Ib and It are the baseline and transmitted light intensities, respectively, and t is the crystal thickness. In this note the author examines the validity of this technique, and shows that significant errors (>5%) are only incurred for materials with high relative permittivity (>2.3) in regions of low absorption.
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