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Detection of organic or inorganic material in Martian meteorite Zagami by vibrational spectroscopy?
International Journal of Astrobiology ( IF 1.7 ) Pub Date : 2020-09-14 , DOI: 10.1017/s147355042000021x
Bruno Leonardo do Nascimento-Dias , Maria Elizabeth Zucolotto , Hugo Camarano Belgo , Talita Valverde Ferreira da Silva , Virgĩlio de Carvalho dos Anjos

Zagami is a basaltic shergottite well characterized among Martian meteorites. For this reason, it is used as a reference sample to verify the feasibility of the vibrational spectroscopy techniques. In general, these techniques seeking extract spectral signatures from individual mineral present in the meteorite samples. Among some FTIR results were detected organic compounds in the Zagami meteorite and recorded in some articles. Based on these results, an analysis of a Zagami meteorite sample was performed using FTIR and Raman spectrometry. Examining the fragment of Zagami meteorite using the FTIR technique, it was possible to identify the same band of 2920 and 2850 cm−1 described by other references, which were interpreted as organic components and were recorded such as aliphatic hydrocarbon. Another unusual result in Martian meteorite was the detection of the 1300 cm−1 band using Raman. The main reason for this peculiarity is that band is characterized in meteorites as a D band. Generally, this band is attributed to structural defects and the disordering of carbon. However, care should be taken when interpreting Raman spectra around 1300 cm−1 and FTIR spectra 2950–2840 cm−1 of the sample from oxidizing environments such as Mars. Misconceptions can occur during the interpretations of the bands, and this can lead to incorrect identification. Thus, an analysis of the mentioned peaks, such as chemical and mineralogical assignments, will be provided and suggested in order to compare the results that mentioned the presence of organic compounds in the Zagami meteorite.

中文翻译:

用振动光谱法检测火星陨石 Zagami 中的有机或无机物质?

Zagami 是一种在火星陨石中具有很好特征的玄武质 Shergottite。出于这个原因,它被用作参考样品来验证振动光谱技术的可行性。通常,这些技术寻求从陨石样本中存在的单个矿物中提取光谱特征。在一些 FTIR 结果中,检测到了 Zagami 陨石中的有机化合物,并记录在一些文章中。基于这些结果,使用 FTIR 和拉曼光谱法对 Zagami 陨石样品进行了分析。使用 FTIR 技术检查 Zagami 陨石碎片,可以识别 2920 和 2850 厘米的相同波段-1其他参考文献中描述的,被解释为有机成分并被记录为脂肪烃等。火星陨石的另一个不同寻常的结果是发现了 1300 厘米-1带使用拉曼。这种特殊性的主要原因是陨石中的波段被描述为 D 波段。通常,该带归因于结构缺陷和碳的无序。但是,在解释 1300 cm 附近的拉曼光谱时应小心-1和 FTIR 光谱 2950–2840 cm-1来自火星等氧化环境的样品。在对频段的解释过程中可能会出现误解,这可能导致错误的识别。因此,将提供和建议对上述峰的分析,例如化学和矿物学分配,以便比较提到 Zagami 陨石中存在有机化合物的结果。
更新日期:2020-09-14
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