红外吸收研究证实了碳酸金刚石的地外起源
Infrared Absorption Investigations Confirm the Extraterrestrial Origin of Carbonado-Diamonds
摘要：
碳化金刚石的第一个完整的红外FTIR吸收光谱证实了最神秘的金刚石（称为碳化金刚石）的星际起源。所有以前的尝试都未能测量碳化金刚石在最重要的IR范围1000-1300 cm-1（10.00-7.69微米）内的吸收。因为二氧化硅夹杂物。在我们的研究中，KBr小球是由粉碎的无二氧化硅碳化金刚石制成的，并且还制备了薄片。100到1000倍的同步辐射红外线辐射允许更大的空间分辨率。避免了夹杂物和孔隙和/或化学污染源。碳化金刚石的FTIR光谱主要描述了单个氮杂质和氢的存在。红外光谱中缺乏可识别的氮聚集体，存在与碳氢化合物拉伸键相关的特征，以及光谱与CVD和前太阳金刚石的相似性表明碳酸金刚石形成于富含氢的星际环境中。这与碳化金刚石被烧结和多孔，具有极低的金属，金属合金，碳化物和氮化物，轻碳同位素，具有玻璃状熔融状铜绿的表面，变形薄片，以及完全不存在原生陆地矿物夹杂物是一致的。这个26 - 38亿年前的碎片体是小行星的比例。
英文摘要：
The first complete infrared FTIR absorption spectra for carbonado-diamond confirm the interstellar origin for the most enigmatic diamonds known as carbonado. All previous attempts failed to measure the absorption of carbonado-diamond in the most important IR-range of 1000-1300 cm-1 (10.00-7.69 micro-m.) because of silica inclusions. In our investigation, KBr pellets were made from crushed silica-free carbonado-diamond and thin sections were also prepared. The 100 to 1000 times brighter synchrotron infrared radiation permits a greater spatial resolution. Inclusions and pore spaces were avoided and/or sources of chemical contamination were removed. The FTIR spectra of carbonado-diamond mostly depict the presence of single nitrogen impurities, and hydrogen. The lack of identifiable nitrogen aggregates in the infrared spectra, the presence of features related to hydrocarbon stretch bonds, and the resemblance of the spectra to CVD and presolar diamonds indicate that carbonado-diamonds formed in a hydrogen-rich interstellar environment. This is consistent with carbonado-diamond being sintered and porous, with extremely reduced metals, metal alloys, carbides and nitrides, light carbon isotopes, surfaces with glassy melt-like patinas, deformation lamellae, and a complete absence of primary, terrestrial mineral inclusions. The 2.6-3.8 billion year old fragmented body was of asteroidal proportions.
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