Raman spectra of solids

Ferraro, John R.; Ziomek, Joseph S.; Mack, G. L.

doi:10.1016/0371-1951(61)80150-1

Cited by 42 publications

(8 citation statements)

References 6 publications

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“…In Figure 1a it is seen that the Raman spectrum of urea at 298K contains bands at 3435, 3357 and 3242 cm -1 with a shoulder at 3323 cm -1 . These frequencies are close to those reported by Ferraro et al [21] and are assigned to the anti-symmetric and symmetric NH 2 stretching vibrations of urea. Band resolution of the NH 2 stretching band envelope gave the relative intensities of the four components listed in Table 1.…”

Section: Raman Spectra Of Urea At 298k and 77ksupporting

confidence: 90%

Raman spectroscopy of urea and urea-intercalated kaolinites at 77 K

Frost

Kristóf

Rintoul

et al. 2000

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

107

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Section: Raman Spectra Of Urea At 298k and 77ksupporting

confidence: 90%

Raman spectroscopy of urea and urea-intercalated kaolinites at 77 K

Frost

Kristóf

Rintoul

et al. 2000

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

107

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“…Transmitted laser and Raman intensities were also measured experimentally through urea and sodium nitrate discs of different thicknesses, 12 with the trends observed comparable to those predicted by calculation. 11 A maximum was also observed in a plot of transmitted Raman intensity against sample thickness for various powders [13][14] and propranolol-mannitol tablets. 3 In the study by Eremeeva and Vorsina, 13 the sample thickness, at which the maximum transmitted Raman intensity was observed, increased with particle size, occurring at 1 mm for particles <0.125 mm and at 2 mm for larger particles.…”

Section: Introductionmentioning

confidence: 70%

Effect of Particle Properties of Powders on the Generation and Transmission of Raman Scattering

Townshend¹,

Nordon²,

Littlejohn³

et al. 2012

Anal. Chem.

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This version is available at https://strathprints.strath.ac.uk/40538/ Strathprints is designed to allow users to access the research output of the University of Strathclyde. Unless otherwise explicitly stated on the manuscript, Copyright © and Moral Rights for the papers on this site are retained by the individual authors and/or other copyright owners. Please check the manuscript for details of any other licences that may have been applied. You may not engage in further distribution of the material for any profitmaking activities or any commercial gain. You may freely distribute both the url (https://strathprints.strath.ac.uk/) and the content of this paper for research or private study, educational, or not-for-profit purposes without prior permission or charge.Any correspondence concerning this service should be sent to the Strathprints administrator: strathprints@strath.ac.ukThe Strathprints institutional repository (https://strathprints.strath.ac.uk) is a digital archive of University of Strathclyde research outputs. It has been developed to disseminate open access research outputs, expose data about those outputs, and enable the management and persistent access to Strathclyde's intellectual output. AbstractTransmission Raman measurements of a 1 mm thick sulphur-containing disc were made at different positions as it was moved through 4 mm of aspirin (150 -212 µm) or microcrystalline cellulose (Avicel) of different size ranges (<38, 53 -106 and 150 -212 µm). The transmission Raman intensity of the sulphur inter-layer at 218 cm -1 was lower when the disc was placed at the top or bottom of the powder bed, compared to positions within the bed and the difference between the sulphur intensity at the outer and inner positions increased with Avicel particle size. Also, the positional intensity difference was smaller for needle-shaped aspirin than for granular Avicel of the same size. The attenuation coefficients for the propagation of the exciting laser and transmitted Raman photons through the individual powders were the same, but decreased as the particle size of Avicel increased; also, the attenuation coefficients for propagation through 150 -212 µm aspirin were almost half of those through similar sized Avicel particles. The study has demonstrated that particulate size and type affect transmitted Raman intensities and consequently, such factors need to be considered in the analysis of powders especially if particle properties vary between the samples.2

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“…An extremely weak displacement at 545 cm-i from the exciting line was found on the Cary instrument which did not show up in the photographic work, although long exposures were used. Spectra of the solid sodium and barium salts also were obtained on the Raman instrument at Argonne using the technique of Ferraro et al [10].…”

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confidence: 99%

Raman and Infrared Spectra of the Dicyanamide Ion

Perkins

1963

Developments in Applied Spectroscopy

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The dicyanamide or dicyanimide ion (NsaC-N-C=N)-is isoelectronic with carbon suboxide and therefore might exist + in a linear resonance form (N-=C=N=C=N-) having the same double bond array as the latter. A comparison of the infrared with Raman spectra should show at once whether this ion is linear or bent, since the linear form would have a center of symmetry and there would therefore be no coincidence in absorption between the two types of spectra.The IR spectrum of this ion has been investigated at the American Cyanamide Corporation laboratories [1], and since this work was completed, Kuhn and Mecke [2] have reported the IR spectra in the NaCI and KBr regions of a number of salts. Since quite low values for bending frequencies for nitrile compounds have been reported [4][5][6], and the Raman spectra of a solution of the sodium salt showed indications of a broad line at 170 cm -1, the infrared measurements were carried out to 100 cm-1 on the instrument at MIT built by Lord and Mc Cubbin [7].EXPERIMENT AL Sodium dicyanamide was the principal salt used in this investigation. Two samples were prepared: one from sodium cyanamide and cyanogen bromide according to the method of Madelung and Kern [8] and the other from zinc dicyanamide kindly supplied by the American Cyanamide Corporation. The spectra of the two samples were identical.Infrared spectra in the CaF 2, NaCI, and KBr regions were run on a Baird Associates Model A double-beam instrument using both nujol mulls and KBr pellets. For the spectra at frequencies below 425 cm-1 , the sodium dicyanamide was dispersed in polyethylene.

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Raman spectra of solids

Cited by 42 publications

References 6 publications

Raman spectroscopy of urea and urea-intercalated kaolinites at 77 K

Raman spectroscopy of urea and urea-intercalated kaolinites at 77 K

Effect of Particle Properties of Powders on the Generation and Transmission of Raman Scattering

Raman and Infrared Spectra of the Dicyanamide Ion

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