![]() ![]() Lu, W., Chou, I.M., Burruss, R.C., Song, Y. “Experimental Determination of the Raman CH 4 Symmetric Stretching (ν1) Band Position from 1–650 bar and 0.3–22 ℃: Application to Fluid Inclusion Studies”. “Micro-Raman Densimeter for CO2 Inclusions in Mantle-Derived Minerals”. “Pressure and Density Dependence of the CH 4 and N 2 Raman Lines in an Equimolar CH4/N2 Gas Mixture”. ![]() “A Review of Advances in Deep-Ocean Raman Spectroscopy”. Zhang, X., Kirkwood, W.J., Walz, P.M., Peltzer, E.T., et al. ![]() “Applications of Raman Spectroscopy in Agricultural Products and Food Analysis: A Review”. Piscaneca, S., Ferrari, A.C., Cantoro, M., Hofmann, S., et al. “Raman Spectroscopy in the Analysis of Food and Pharmaceutical Nanomaterials”. “Use of the Raman Spectrometer in Gemological Laboratories: Review”. “Raman Spectroscopy for Fluid Inclusion Analysis”. “Raman Spectroscopy: Recent Advancements, Techniques and Applications”. “Raman Spectroscopy of Lipids: A Review”. “Raman Microspectrometry of Fluid Inclusions”. Nevertheless, significant errors in peak position and intensity were still observed in the results from fitting of weak and wide Raman bands having unnormalized intensity/FWHM ratios lower than 200 counts/cm −1.īurke, E.A.J. Once the resolution of the Raman spectrometer has been properly accounted for, our findings show that the precision in peak position and intensity can be improved significantly by fitting the measured Raman peaks with appropriate profiles. Multiple peaks that are not clearly separated can be fit simultaneously, provided the residuals in the fitting of one peak will not affect the fitting of the remaining peaks to a significant degree. The asymmetric O–H stretching vibrations of H 2O and the Raman bands of soda–lime glass are best fit using several Gaussian profiles, whereas the emission lines from a florescent light are best fit using beta profiles. Specifically, the symmetric Raman bands of mineral crystals and non-aqueous fluids are best fit using Gaussian–Lorentzian or Voigtian profiles, whereas the asymmetric Raman bands are best fit using Pearson type IV profiles. From the fitting results of the Raman bands investigated in this study, the fitted peak position, intensity, area and full width at half-maximum (FWHM) values of the measured Raman bands can vary significantly depending upon which peak profile function is used in the fitting, and the most appropriate fitting profile should be selected depending upon the nature of the Raman bands. In order to investigate the effects of peak modeling using various algorithms on peak fitting results, the representative Raman bands of mineral crystals, glass, fluids as well as the emission lines from a fluorescent lamp, some of which were measured under ambient light whereas others under elevated pressure and temperature conditions, were fitted using Gaussian, Lorentzian, Gaussian–Lorentzian, Voigtian, Pearson type IV, and beta profiles. Fitting experimentally measured Raman bands with theoretical model profiles is the basic operation for numerical determination of Raman peak parameters. ![]()
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