Optimization Of The Sample Technique For NIR FT Raman Spectroscopy

Bernhard Schrader; Andreas Hoffmann; Martin Tischer; Rolf Podschadlowski; Arno Simon

doi:10.1117/12.969418

1 December 1989 Optimization Of The Sample Technique For NIR FT Raman Spectroscopy

Bernhard Schrader, Andreas Hoffmann, Martin Tischer, Rolf Podschadlowski, Arno Simon

Proceedings Volume 1145, 7th Intl Conf on Fourier Transform Spectroscopy; (1989) https://doi.org/10.1117/12.969418
Event: Seventh International Conference on Fourier and Computerized Infrared Spectroscopy, 1989, Fairfax, VA, United States

Abstract

Raman spectroscopy is a powerful complement to infrared spectroscopy due to experimental as well as theoretical aspects: However, 'classical' Raman spectroscopy is not commonly used. This is mainly due to the fact that the fluorescence of minute amounts of impurities, excited by the radiation in the UV or visible range can mask the Raman spectra completely. NIR FT Raman spectrometers' have several advantages. As exciting light usually the radiation of the Nd-doped YAG laser at a wavelength of 1064 nm is used. Problems with fluorescing samples are largely reduced. There is the 'throughput advantage' of the Michelson interferometer and its high wavenumber accuracy. However, the intensity of the Raman radiation is inversely proportional to the fourth power of its absolute frequency. Laser light fluxes larger by the ν4-factor of about 30 are necessary to achieve the same radiance of the Raman lines in the NIR compared to the visible region. This enhances the danger of pyrolysis of the sample. In order to reduce this danger the whole instrument should have the largest possible optical conductance. Interferometers are therefore appropriate when they are properly matched to a sample arrangement with maximal efficiency.

Citation Download Citation

Bernhard Schrader, Andreas Hoffmann, Martin Tischer, Rolf Podschadlowski, and Arno Simon "Optimization Of The Sample Technique For NIR FT Raman Spectroscopy", Proc. SPIE 1145, 7th Intl Conf on Fourier Transform Spectroscopy, (1 December 1989); https://doi.org/10.1117/12.969418

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