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The measurement of small band shifts using Fourier transform Raman spectroscopy and curve fitting: The acetone H6/D6 system

✍ Scribed by G.M. Warnes

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 1022 KB
Volume: 49
Category: Article
ISSN: 1386-1425
DOI: 10.1016/0584-8539(93)80109-n

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✦ Synopsis

A method for measuring very small shifts in the position of Raman bands in F'f Raman spectra is presented. This centres on band fitting calculations, with mixtures of acetone f-&and acetone D6 being used as a trial system. Different cell designs were used, the best results being obtained from a cuvette where anomalous shifts from variations in sample position were eliminated. Linear shifts were found in the CH, CD and CC stretching bands as a function of the molar composition of the sample. The CH and CD bands were also found to narrow in addition to shifting. Synthetic spectra were generated to investigate the effect of noise on the calculation and these indicate that a signal-to-noise ratio of 20 is sufficient to observe shifts of the order of 0.1 cm-'. Plasma emission lines from the laser can be used as an internal frequency standard, thus allowing the method to be applied to solid samples.

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