Abstract
An equation is derived which relates the unbalance in a differential spectrum to the difference between the frequencies at which maximum absorption occurs in the reference and sample beams. Used in conjunction with the differential spectra of a solute dissolved in various solvents, the equation allows one to determine small solvent-induced infrared frequency shifts with conventional double-beam prism spectrometers. Under favourable conditions the shifts determined by the differential method using a sodium chloride prism are within 0.3 cm − of those measured with a high-resolution prism-grating instrument. Limitations of the method imposed by large frequency shifts, band asymmetry, or large differences in band width are presented. Potential extensions of the method to infrared optics of higher resolving power and to other spectral regions are discussed briefly.
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