Mid infrared throughput with 5.MU.m aperture for H2O determination of an andesitic glass: Comparison of synchrotron radiation source at SPring-8 with conventional light sources.

Kawamoto, Tatsuhiko; Kagi, Hiroyuki; Yamashita, Shigeru; Handa, Tomoko; Matsukage, Kyoko N.; Ikemoto, Yuka; Moriwaki, Toshimichi; Kimura, Hiroaki

doi:10.2343/geochemj.37.253

Cited by 4 publications

(3 citation statements)

References 18 publications

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“…We, therefore, conducted recalibration of the molar absorption coefficients using the same set of glasses (Yamashita 1999) at the Institute for Geothermal Sciences of Kyoto University at Beppu. The synthesized glasses were doubly polished and analyzed by FT-IR spectrometer (JASCO 610 Fourier-transform spectrometer, comprised of a JASCO Micro 20 IR microscope, InSb detector, CaF 2 beam splitter and W-halogen lamp; Kawamoto et al 2003). The results of calibration using synthesized glasses are shown in Fig.…”

Section: Ft-ir Analysismentioning

confidence: 99%

Melt inclusion analysis of the Unzen 1991–1995 dacite: implications for crystallization processes of dacite magma

et al. 2005

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Dacitic magma, a mixture of high-temperature (T) aphyric magma and low-T crystal-rich magma, was erupted during the 1991-1995 Mount Unzen eruptive cycle. Here, the crystallization processes of the low-T magma were examined on the basis of melt inclusion analysis and phase relationships. Variation in water content of the melt inclusions (5.1-7.2 wt% H 2 O) reflected the degassing history of the low-T magma ascending from deeper levels ($250 MPa) to a shallow magma chamber ($140 MPa). The ascent rate of the low-T magma decreased markedly towards the emplacement level as crystal content increased. Cooling of magma as well as degassing-induced undercooling drove crystallization. With the decreasing ascent rate, degassing-induced undercooling decreased in importance, and cooling became more instrumental in crystallization, causing local and rapid crystallization along the margin of the magma body. Some crystals contain scores of melt inclusions, whereas there are some crystals without any inclusions. This heterogeneous distribution suggests the variation in the crystallization rate within the magma body; it also suggests that cooling was dominant cause for melt entrapment. Numerical calculations of the cooling magma body suggest that cooling caused rapid crystal growth and enhanced melt entrapment once the magma became a crystal-rich mush with evolved interstitial melt. The rhyolitic composition of melt inclusions is consistent with this model.

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Section: Ft-ir Analysismentioning

confidence: 99%

Melt inclusion analysis of the Unzen 1991–1995 dacite: implications for crystallization processes of dacite magma

et al. 2005

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“…Moreover, the high brightness allows FT-IR spectra to be obtained directly on the surfaces of samples and becomes an important supporting tool for nondestructive testing of these objects [9][10][11][12][13]. It has been successfully applied to the study of biology [14][15][16][17][18], geology [19][20][21][22], materials science [23][24][25], astrophysics [26][27], and archaeology [28][29][30][31][32][33].…”

Section: Introductionmentioning

confidence: 99%

Synchrotron radiation study on Thai reddish glass

Boonruang

Won-In

Thumanu

et al. 2022

J. Phys.: Conf. Ser.

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It is well-known that red glass has been used as a decorative glass in Thailand for hundred years. Pieces of reddish decorative glasses (Ancient Burmese Glass: ABG, Ancient Thai Glass: ATG, and Modern Imported Glass: MIG) have been collected from different areas in Thailand. The elemental composition and morphology of these samples have been examined using scanning electron microscopy equipped with energy dispersive X-ray spectroscopy (SEM-EDS) and proton-induced X-ray emission spectroscopy (PIXE). The binding components have been analyzed using infrared spectroscopy based on synchrotron radiation (SR IR). PIXE results indicate a presence of trace elements which is beyond the limit of detection of EDS. It has been found that ABG and MIG are soda-silicate glass, while ATG is lead-based glass. The red coloration in ABG, ATG, and MIG is affected by the contents of Cu, Cd, and Se. It is also found that ABG and MIG have been produced using crucible vessel and glass-making furnace, respectively, while ATG has been produced using either crucible vessel or glass-making furnace. With the high brightness of the synchrotron source, SR IR can analyze the sample with a high spatial resolution of 20 × 20 µm2. SR IR results confirm the presence of inorganic and organic functional groups in glass samples which exhibit distinctive peaks for different types of glass.

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“…Among these, the infrared microspectroscopy station has been used mainly in the mid-infrared spectral region [6][7][8]. In this paper, we examined the capability of our microscope in the far-infrared region.…”

Section: Introductionmentioning

confidence: 99%