A wide-range Raman shift wavenumber measure based on a polymer material.

The wave number of the Raman shift is one of the most important parameters in Raman spectroscopy. Since the accuracy of determining the wave number of the Raman shift strongly depends on the technical characteristics of the Raman spectrometers and the measurement conditions, physically and chemically stable reference materials that would be convenient for users are required to calibrate such devices on the wave number scale. One of the promising areas of development of such reference materials that meet these requirements are solid-state reference materials developed in our country and abroad. A Raman shift wave number measure has been developed and tested for the purpose of approving the type of measuring instrument. The measure is intended for calibration and verification of measuring instruments on the scale of Raman shift wave numbers. The measure is a polymer film consisting of polystyrene and sulfur and placed in a special mandrel. The measure material is in a solid aggregate state. The metrological characteristics of the developed measure have been studied. It has been established that the measure allows storing and transmitting a unit of Raman shift wave numbers for Raman scattering excitation wavelengths of 532–785 nm in the range of 80–3000 cm^–1 with an error of no more than 1 cm^–1. Traceability is ensured to the State primary special standard of units of energy, energy density distribution, pulse duration and wavelength of laser radiation GET 187-2016 and the State working standard of the unit of wavelength for fiber-optic information transmission systems in the range of values from 0.4 to 3.4 μm (3.1.ZZA.0114.2018). The combination of polystyrene and sulfur lines in the Raman spectrum of the developed measure made it possible to expand (in comparison with the range of similar solid-state measures of foreign production) the range of wave numbers of Raman shifts, especially in the short-wave region.

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