The perfection of Raman spectroscopic gas densimeters

Abstract Raman spectroscopy can be used to determine density of gases, because the energy fundamental vibrational modes is affected by intermolecular distances. The key problem estimation exact peak positions bands, analyses require a precision that mostly less than pixel resolution modern spectrometers. A new method bands and atomic emission lines in discontinuous spectrum without numerical manipulations tested this study: modified scanning multichannel technique. Relocation gratings with Sinus Arm Drive performed over distance only fraction size allows position estimations precisions smaller uncertainty estimation. This was not determined previous studies about gas densimeters, resulting large variety inconsistent data. fluid inclusions quartz. CO 2 0.1477 ± 0.0006 g·cm −3 0.8880 0.0007 microthermometry correspond Fermi dyad 103.12 0.27 cm −1 104.71 0.26 . CH 4 0.3461 0.0002 0.4011 0.0001 2910.66 0.12 2910.57 error these numbers must regarded as best estimated uncertainties positions, which are probably slightly adjusted higher values due mechanical irregularities systems.