Rai Abhishek K, Pati Jayanta K, Parigger Christian G, Dubey Sonali, Rai Awadhesh K, Bhagabaty Balen, Mazumdar Amulya C, Duorah Kalpana
Department of Earth and Planetary Sciences, Nehru Science Centre, University of Allahabad, Allahabad 211002, India.
National Center of Experimental Mineralogy and Petrology, 14, Chatham Lines, University of Allahabad, Allahabad 211002, India.
Molecules. 2020 Feb 22;25(4):984. doi: 10.3390/molecules25040984.
Meteorites are the recoverable portions of asteroids that reach the surface of the Earth. Meteorites are rare extraterrestrial objects studied extensively to improve our understanding of planetary evolution. In this work, we used calibration-free laser-induced breakdown spectroscopy (CF-LIBS) to evaluate the quantitative elemental and molecular analyses of the Dergaon meteorite, a H 4-5 chondrite fall sample from Assam, India. Spectral signatures of H, N, O, Na, Mg, Al, Si, P, K, Ca, Ti, Cr, Mn, Fe, Co, Ni, andIrweredetected. Along with the atomic emission, this work reports the molecular emission from FeO molecules. The concentration of the measured elements obtained using CF-LIBS is in close agreement with earlier reports. The elements H, N, and O and their concentrations are estimated by using CF-LIBS for the first time. This study applies laser spectroscopy to establish the presence of Ni, Cr, Co, and Ir in meteorites. The elemental analysis forms the basis for the establishment of the potential molecular composition of the Dergaon meteorite. Moreover, the elemental analysis approach bodes well for in-situ analyses of extraterrestrial objects including applications in planetary rover missions.
陨石是到达地球表面的小行星的可回收部分。陨石是罕见的地外物体，人们对其进行了广泛研究，以增进我们对行星演化的理解。在这项工作中，我们使用了无标样激光诱导击穿光谱法（CF-LIBS）来评估来自印度阿萨姆邦的H 4-5球粒陨石坠落样本——德高恩陨石的定量元素和分子分析。检测到了H、N、O、Na、Mg、Al、Si、P、K、Ca、Ti、Cr、Mn、Fe、Co、Ni和Ir的光谱特征。除了原子发射外，这项工作还报告了FeO分子的分子发射。使用CF-LIBS获得的测量元素浓度与早期报告密切一致。首次使用CF-LIBS估算了元素H、N和O及其浓度。本研究应用激光光谱法确定陨石中Ni、Cr、Co和Ir的存在。元素分析为确定德高恩陨石潜在的分子组成奠定了基础。此外，这种元素分析方法对于地外物体的原位分析，包括在行星漫游车任务中的应用，具有良好的前景。
