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Measurement of Solvent Shifts by Raman Difference Spectroscopy

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The application of Raman difference spectroscopy for the determination of the small frequency shifts arising from solvent effects has been demonstrated. Data are presented for benzene-carbon disulfide, benzene-pyridine, and acetone-chloroform mixtures. The majority of the solvent shifts measured are less than 1.0 cm−1 and these can generally be determined with better than 10% accuracy using a rotating two-compartment liquid cell. The smallest shift measured in this work was 0.06 cm−1. While statistical analysis indicates that uncertainties as small as ±0.01 cm−1 can be obtained in many cases, artifacts may cause apparent shifts up to ±0.03 cm−1.

Keywords: Methods, analytical; Raman spectroscopy; Techniques, spectroscopic

Document Type: Research Article


Affiliations: 1: Physikalisches Institut, Universität Bayreuth, 8580 Bayreuth, West Germany; on leave from Department of Chemistry, Texas A&M University, College Station, TX 77843 2: Physikalisches Institut, Universität Bayreuth, 8580 Bayreuth, West Germany

Publication date: May 1, 1981

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