Method for the measurement of absolute Raman scattering cross sections of crystalline powders

D'Orazio, M.; Schräder, Bernhard

doi:10.1002/jrs.1250040307

Cited by 15 publications

(3 citation statements)

References 19 publications

(8 reference statements)

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“…Given that the elastic coefficient is proportional to the reciprocal of the particle diameter, and after assigning values to a, s, and k, according to the main conclusions obtained by D'orazio and Schrader, 29 the backscattered Raman intensity will increase with decreasing particle diameter and with increasing sample thickness until it reaches a plateau after a certain penetration into the sample.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Rapid Determination of Iron Content in Hematite by Differential Raman Spectroscopy

Yin

et al. 2022

J. Phys. Chem. C

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Online component detection is highly desirable for monitoring industrial raw materials and imported raw materials in customs. Raman spectroscopy is a possible route for in situ monitoring. However, so far, few qualitative estimations for online solid-state materials such as ore are reported due to the low accuracy of the measurements. Herein, a kind of potential online portable shifted-frequency excitation differential Raman spectroscopy (SEDRS) system was built for the first time to quantitatively determine the iron content in hematite samples with merits of no background noise and a high signal-to-noise ratio. The Raman spectra of hematite generally have strong A 1g mode at 230 and 498 cm −1 , and band intensity analysis illustrates a good positive correlation with iron content, which are used for quantitative analysis via principal component analysis and partial least squares regression. In contrast to the quantitative results based on singlefrequency excitation Raman spectra, the average relative error of the differential data treated with SEDRS was only 1.20%. The distribution of particle size for solid-state material is proven to have been the main factor for impacting the accuracy by comparing the peak intensity at 230 cm −1 of powders with different particle sizes. These findings confirm that SEDRS analysis is a high-accuracy reliable tool for analyzing iron content in hematite with uniform particle size, providing a feasible method to remotely detect the iron content of ore online.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Rapid Determination of Iron Content in Hematite by Differential Raman Spectroscopy

Yin

et al. 2022

J. Phys. Chem. C

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“…According to Kubelka-Munk theory, diffuse reflectance by particles (much larger than the wavelength of the light) increases as particle size decreases. Therefore, overall Raman scattering decreases because the sample volume irradiated decreases (D'orazio & Schrader 1976;Schrader et al 1991). However, in contrast to this theory and early work, more recent studies observed increased peak intensities of powdered inorganic salts as particle size decreased (Pellow-Jarman et al 1996; Wang et al 2002).…”

Section: Y Xbmentioning

confidence: 89%

Raman spectroscopy for quantitative analysis of pharmaceutical solids

Strachan

Rades

Gordon

et al. 2007

Journal of Pharmacy and Pharmacology

212

140

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Raman spectroscopy is experiencing a surge in interest in solid-state pharmaceutical applications. It is rapid, non-destructive, no sample preparation is required and measurements can be made in aqueous environments. It can be used for not only qualitative, but also quantitative, analysis. In this paper, the use of Raman spectroscopy for quantitative analysis of pharmaceutical solids is reviewed. The technique has been used for chemical and physical form analysis. Physical form analysis has involved quantification of polymorphism, hydrates, the amorphous form and, recently, protein conformation. Initially, simple powder systems were quantified, although this has since extended to complex pharmaceutical formulations, including tablets, capsules, microspheres and suspensions. Formulations have also been analysed through packaging. The characteristics of the technique make it ideal for process monitoring and it has been used to quantify changes in-situ during processes such as wet granulation and batch crystallisation. The theoretical basis of quantitative Raman spectroscopy, common data analysis approaches, including multivariate analysis, and sources of error in quantitative analysis are also discussed.

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“…However, there have been some publications which are of interest here. Papers on the measurement (53) and theory (54) of Raman scattering cross-sections for crystals and a Raman intensities study of Na2S04 single crystal (55) have appeared. The potential for Raman spectrometry in cement chemistry has been discussed (56,57) and the analysis of discrete fine particles as small as 0.7 pm has been described (58).…”

Section: Instrumentation and Samplingmentioning

confidence: 99%

Raman spectrometry

Gardiner¹

1978

Anal. Chem.

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Method for the measurement of absolute Raman scattering cross sections of crystalline powders

Cited by 15 publications

References 19 publications

Rapid Determination of Iron Content in Hematite by Differential Raman Spectroscopy

Rapid Determination of Iron Content in Hematite by Differential Raman Spectroscopy

Raman spectroscopy for quantitative analysis of pharmaceutical solids

Raman spectrometry

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