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首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >The luminescent carbon-bearing microinclusion enigma in the Kimi Unit, Rhodope, Greece: Raman microscopic point analyses and mapping with different lasers
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The luminescent carbon-bearing microinclusion enigma in the Kimi Unit, Rhodope, Greece: Raman microscopic point analyses and mapping with different lasers

机译：希腊罗多彼州基米单位的发光含碳微夹杂物之谜：拉曼显微点分析和不同激光制图

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The Kimi Unit of the Rhodope Metamorphic Province (RMP), NE Greece, experienced ultrahigh-pressure metamorphism (UHPM), as documented by the unequivocal presence of diamond microinclusions in metapelitic garnet porphyroblasts. Certain peculiar lozenge-shaped 2-8 mu m sized inclusions in diamond-bearing garnets reveal a broad composite and asymmetric triplet band (phase XXX) at similar to 1331 cm(-1) in their Raman spectra acquired with a 632.8 nm He-Ne laser, initially attributed to an sp(3)-hybridized C-polymorph. These have been meticulously re-investigated by means of combined 2-wavelength (514.5 nm/632.8 nm laser) Raman microscopy. Raman mapping has been extensively employed in order to examine the spatial distribution of phase XXX and of other phases in these polyphase inclusions and to explore for additional Raman bands. The triplet band at similar to 1331 cm(-1) measured with the 632.8 nm laser shifts to much higher wavenumbers (similar to 4966 cm(-1)) when excited with a 514.5 nm Ar+ laser, proving that the XXX triplet is not a real Raman band but a luminescence one at similar to 691.1 nm. Numerous hypotheses on the nature of the mysterious phase XXX (e.g. Cr3+-bearing mineral, carbonate, C polymorph, gas, organic phase) are explored and discussed but all are shown to be unsatisfactory. It is suggested that XXX occurs as nanocrystals that luminesce strongly giving the appearance (in Raman maps) of being larger. (c) 2007 Elsevier B.V. Ail rights reserved.
机译：希腊东北部的罗多彼州变质省（RMP）的Kimi单位经历了超高压变质（UHPM），其特征是在特异的石榴石成岩细胞中明确存在金刚石微包裹体。含钻石的石榴石中某些特殊的菱形2-8微米大小的内含物在632.8 nm He-Ne的拉曼光谱中显示出宽广的复合和不对称三重态谱带（XXX相），其拉曼光谱类似于1331 cm（-1）。激光，最初归因于sp（3）杂交的C多晶型物。这些已经通过组合的2波长（514.5 nm / 632.8 nm激光）拉曼显微镜进行了仔细的研究。为了检查这些多相夹杂物中的XXX相和其他相的空间分布，并探索其他拉曼谱带，拉曼映射已被广泛采用。当用514.5 nm Ar +激光激发时，用632.8 nm激光测得的类似于1331 cm（-1）的三重峰带移到更高的波数（类似于4966 cm（-1）），证明XXX三重峰不是真正的拉曼光谱带，但有一个类似于691.1 nm的发光带。已探索和讨论了有关神秘相XXX（例如含Cr3 +的矿物，碳酸盐，C多晶型物，气体，有机相）的性质的多种假设，但均显示不令人满意。建议XXX以发光的纳米晶体的形式出现，从而使外观（在拉曼图中）更大。 （c）2007 Elsevier B.V. Ail版权所有。

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