Infrared spectra of pyroxenes (crystalline chain silicates) at room temperature
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PYROXENE SPECTRA from Bowey, J. E., Hofmeister, A., Keppel, E. 2020 MNRAS, 497, 3658<br> Infrared Spectra of Pyroxenes (Crystalline Chain Silicates) at Room Temperature<br> https://doi.org/10.1093/mnras/staa2227 We present quantitative room-temperature spectra of 17 Mg-, Fe-, and Ca-bearing ortho- and clinopyroxenes, and a Ca-pyroxenoid in order to discern trends indicative of crystal structure and a wide range of composition. Data are produced using a diamond anvil cell: our band strengths are up to six times higher than those measured in KBr or polyethylene dispersions, which include variations in path length (from grain size) and surface reflections that are not addressed in data processing. This is the README.txt file in the upload. Data doi is : 10.5281/zenodo.5564539 PYROXENE SPECTRA from Bowey, J. E., Hofmeister, A., Keppel, E. 2020 MNRAS, 497, 3658<br> Infrared Spectra of Pyroxenes (Crystalline Chain Silicates) at Room Temperature<br> https://doi.org/10.1093/mnras/staa2227 Spectra are in Figure 4 and compositions are listed in Table 1. Fig 4 Left: En-Fs orthopyroxenes (orthoplot.pdf) En99tau.dat<br> En92tau.dat<br> En90tau.dat<br> En85tau.dat (lower resolution MID-ir spectrum)<br> En55tau.dat<br> En40tau.dat<br> En12tau.dat<br> En1tau.dat Pigeonite: Wo10En62tau.dat Right: Clinopyroxenes in the Enstatite-Diopside-Wollastonite<br> Diopside-Hedenbergite solid-solution series (enst-wol.pdf) En-Dp series. Wo21En79tau.dat<br> Wo30En70tau.dat<br> Wo40En60tau.dat Wollastonite: Wo99En1tau.dat Dp-Hd series Wo50En50tau.dat<br> Wo50En47tau.dat<br> Wo49En36tau.dat<br> Wo47En6tau.dat Pigeonite: Wo36En37tau.dat files are two column ascii. column 1 increment varies between files. column 1 (x) is in increasing wavenumber (cm^-1)<br> column 2 (tau) is absorbance in optical depth units per micron thickness<br> of sample. col1: x to wavelength (micron) conversion is 10^4/x col2: tau to mass absorption coefficient conversion (kappa) is tau *<br> 10^4/rho where rho is the mass density of the specimen (gcm^-3),<br> estimates are in table 1 [Note that kappa contains inherent<br> uncertainties due to the spacing between the grains sampled and<br> the effects discussed in Section 7.1]
辉石光谱(Pyroxene Spectra) 来源:Bowey, J. E.、Hofmeister, A.、Keppel, E.,2020,《皇家天文学会月报》(Monthly Notices of the Royal Astronomical Society, MNRAS),第497卷,第3658页 室温下辉石(结晶链状硅酸盐)的红外光谱 DOI:https://doi.org/10.1093/mnras/staa2227 本数据集包含17种含镁(Mg)、铁(Fe)、钙(Ca)的斜方辉石(orthopyroxene)与单斜辉石(clinopyroxene),以及1种钙辉石类(Ca-pyroxenoid)矿物的定量室温红外光谱,旨在揭示晶体结构与广泛组分变化所体现的光谱变化规律。 本研究采用金刚石压腔(diamond anvil cell, DAC)采集数据:相较于以溴化钾(KBr)或聚乙烯(polyethylene)为分散介质测得的谱带强度,本数据集的谱带强度最高可达其6倍。此前的分散介质测试未校正光程长度(由晶粒尺寸引起)与表面反射的影响,这些因素会对光谱结果产生干扰。 本文件为上传数据集中的README.txt。数据集的数字对象唯一标识符(Digital Object Identifier, DOI)为:10.5281/zenodo.5564539。 辉石光谱(Pyroxene Spectra) 来源:Bowey, J. E.、Hofmeister, A.、Keppel, E.,2020,《皇家天文学会月报》(MNRAS),第497卷,第3658页 室温下辉石(结晶链状硅酸盐)的红外光谱 DOI:https://doi.org/10.1093/mnras/staa2227 所有光谱详见图4,组分信息列于表1。 图4左侧为En-Fs系列斜方辉石(对应数据文件orthoplot.pdf),包含以下数据文件: En99tau.dat、En92tau.dat、En90tau.dat、En85tau.dat(低分辨率中红外光谱)、En55tau.dat、En40tau.dat、En12tau.dat、En1tau.dat,以及易变辉石(Pigeonite)样品Wo10En62tau.dat。 图4右侧为顽火辉石(Enstatite, En)-透辉石(Diopside, Dp)-硅灰石(Wollastonite, Wo)、透辉石-钙铁辉石(Hedenbergite, Hd)固溶体系列的单斜辉石(对应数据文件enst-wol.pdf,即En-Dp系列),包含以下数据文件: Wo21En79tau.dat、Wo30En70tau.dat、Wo40En60tau.dat; 硅灰石样品Wo99En1tau.dat; 钙铁辉石-透辉石(Dp-Hd)系列样品Wo50En50tau.dat、Wo50En47tau.dat、Wo49En36tau.dat、Wo47En6tau.dat; 以及易变辉石样品Wo36En37tau.dat。 所有数据文件均为两列ASCII格式,不同文件的第一列步长存在差异。第一列(x轴)为递增的波数(wavenumber),单位为cm⁻¹;第二列(tau)为以每微米样品厚度为基准的光深度单位吸光度。 第一列波数与波长(单位:微米)的转换公式为:10⁴/x; 第二列吸光度tau与质量吸收系数κ的转换公式为:κ = τ × 10⁴/ρ,其中ρ为样品的质量密度,单位为g·cm⁻³,密度估算值详见表1。【注:由于采样晶粒间的间距以及7.1节讨论的效应影响,质量吸收系数κ存在固有不确定性。】



