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Published in

IOP Publishing, Journal of Physics: Conference Series, (548), p. 012017, 2014

DOI: 10.1088/1742-6596/548/1/012017

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Raman under liquid nitrogen (RUN)

Journal article published in 2014 by R. N. Compton, N. I. Hammer ORCID
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

The recording of Raman spectra for many molecules in air at room temperature is difficult or impossible as a result of sample degradation which is due to a combination of laser heating and oxidation. Often nitrogen gas is applied over the sample in an attempt to reduce oxidation. Also, the samples are sometimes cooled to reduce ro-vibrational "hot bands" and enhance the spectra. We have found great utility in recording Raman spectroscopy of samples under liquid nitrogen, a technique we call RUN. The RUN spectra show much higher resolution as a result of ro-vibrational cooling and in some cases cooling produces only the lowest energy conformer of the molecular ensemble further simplifying the spectra. A very sharp Raman peak at 2327.0 cm−1, due to liquid nitrogen, also serves as a convenient wavelength calibration. We also demonstrate the ability to clearly delineate the lattice modes for naphthalene and benzene crystals.