Abstract
Sensitive techniques based upon the thermooptic effect are now available to measure weak absorptivities α of solutions (α ~ 10−3 cm−1). In many cases the detection of trace amounts of dissolved material is complicated by large background absorptions (α ~ 10−3 cm−1) due to the solvent. In these instances, the signal which is a measure of solute absorption alone is smaller than the precision of the signal due to combined solute and solvent absorptions.
© 1981 Optical Society of America
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