Feasibility of determining the quantitative OH content of garnets with Raman spectroscopy

Arredondo, Elizabeth H.; Rossman, George R.

doi:10.2138/am-2002-2-312

Cited by 23 publications

(15 citation statements)

References 4 publications

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“…The peak intensity and the area under the OHbands increased with increasing water content in the crystals. Low-wavenumber spectra measured with the 514 and 532 nm laser excitations corresponded to Raman spectra previously observed for diopside and grossular (e.g., Kolesov and Geiger 1998;Huang et al 2000;Arredondo and Rossman 2002;Prencipe et al 2012). The two dominant features for diopside are the bands at 667 and 1013 cm − 1 associated with a Si-O-Si bending mode and a Si-O stretching mode, respectively.…”

Section: Transmission Raman Spectroscopysupporting

confidence: 78%

“…2) as done in previous studies (e.g. Arredondo and Rossman 2002;Bolfan-Casanova et al 2014). The number of peaks for normalization can differ (e.g., Thomas 2000; Thomas et al 2008a;Arredondo and Rossman 2002;Fig.…”

Section: Figmentioning

confidence: 93%

“…Weis et al 2016). One garnet crystal, a grossular from Ala valley in Piedmont in Italy, was included in the study (Arredondo and Rossman 2002).…”

Section: Samplesmentioning

confidence: 99%

“…The first one, referred to as the "comparator technique", uses an external calibration standard, such as volcanic or synthetic glass, where the water content, refractive index and density are known (e.g., Thomas et al 2008a, b). The second method employs an internal calibration using the normalization of integrated OH-intensities with the area of one or several peaks, potentially from the silica region of a mineral's spectrum (e.g., Arredondo and Rossman 2002;Bolfan-Casanova et al 2014). A disadvantage of the comparator technique is that the exact density and the refractive index of the reference glass or the studied samples may be unknown which affects the correction of integrated Raman intensities.…”

Section: Figmentioning

confidence: 99%

“…Arredondo and Rossman 2002;Bolfan-Casanova et al 2014). The number of peaks for normalization can differ (e.g., Thomas 2000; Thomas et al 2008a;Arredondo and Rossman 2002;Fig. 5 Difference between Raman spectra of clinopyroxene taken in forward (black) and backscatter (blue) configuration with a 514 nm excitation.…”

Section: Figmentioning

confidence: 99%

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Hydrogen analysis in nominally anhydrous minerals by transmission Raman spectroscopy

2018

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We present a new approach for the analysis of water in nominally anhydrous minerals using transmission Raman spectroscopy. Using this approach, the laser was shone through thin, nearly transparent samples of clinopyroxene, garnet and synthetic rhyolite glass. To remove mineral-induced background and to improve the quality of the OH spectral region, specifically for clinopyroxene, a reference spectrum of a dehydrated crystal was measured and subtracted. Water contents of all clinopyroxene samples were previously determined by Fourier transformed infrared spectroscopy (FTIR). The application of transmission Raman spectroscopy and a reference spectrum of a dry sample revealed a noticeable improvement in the quality of spectra and thus the detection limit, compared to the standard backscattering configurations. We show that the quality of transmission spectra and the detection limit depend on the sample thickness, and that the thickness has to be taken into account when measuring and comparing OH-integrated intensity and water content if the results are used for OH quantification.

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Section: Transmission Raman Spectroscopysupporting

confidence: 78%

Section: Figmentioning

confidence: 93%

“…Weis et al 2016). One garnet crystal, a grossular from Ala valley in Piedmont in Italy, was included in the study (Arredondo and Rossman 2002).…”

Section: Samplesmentioning

confidence: 99%

Section: Figmentioning

confidence: 99%

Section: Figmentioning

confidence: 99%

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Hydrogen analysis in nominally anhydrous minerals by transmission Raman spectroscopy

2018

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Characterizing amorphous silicates in extraterrestrial materials: Polymerization effects on Raman and mid‐IR spectral features of alkali and alkali earth silicate glasses

Wang²,

Krawczynski³

2017

JGR Planets

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Amorphous silicates are common in extraterrestrial materials, especially in carbonaceous chondrites of petrologic types 1 and 2. In addition, high percentage of amorphous components and poorly crystalline phyllosilicates were found in the mudstones at Gale Crater by the CheMin instruments on board of Mar Curiosity rover, which illustrates the importance of characterizing amorphous silicates in future planetary surface explorations. The structure of an amorphous silicate can vary in two aspects: the degree of polymerization and the degree of crystallinity. Here we present the first phase study on characterizing synthetic alkali and alkali earth silicate glasses with different degrees of polymerization by using vibration spectroscopy. Compared with crystalline silicates, their Raman and mid‐IR spectra show broad spectral peaks but have the similar peak positions. We find that a change in the degree of polymerization of these silicate glasses affects their Raman band positions, especially the ratio of Raman band intensities, as well as the positions of the Christiansen feature and reststrahlen bands in their mid‐IR absorbance spectra. Based on these observations, we establish a calibration curve that could enable semiquantification of the polymerization degree of silicate glasses in planetary surface/subsurface materials during future robotic planetary surface exploration missions.

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IR calibrations for water determination in olivine, r-GeO2, and SiO2 polymorphs

et al. 2009

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Feasibility of determining the quantitative OH content of garnets with Raman spectroscopy

Cited by 23 publications

References 4 publications

Hydrogen analysis in nominally anhydrous minerals by transmission Raman spectroscopy

Hydrogen analysis in nominally anhydrous minerals by transmission Raman spectroscopy

Characterizing amorphous silicates in extraterrestrial materials: Polymerization effects on Raman and mid‐IR spectral features of alkali and alkali earth silicate glasses

IR calibrations for water determination in olivine, r-GeO2, and SiO2 polymorphs

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