Optical excitation spectroscopy of the Luna 24 sample 24125
Optical excitation spectroscopy of the Luna 24 sample 24125
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Luna 24 样品 24125 的光学激发光谱
DOI：
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发表时间：
1980
期刊：
影响因子：
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通讯作者：
G. Fielder
中科院分区：
文献类型：
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作者：
D. Telfer;G. Fielder
在室温下，使用来自 450 W 氙气源的单色光对样品 L24125 进行发光光学激发光谱，结果表明斜长石组分中存在 Fe3+ 离子，其浓度使得可以观察到该物质的配体场带。该光谱与富含斜长石的阿波罗样品和陆地钙质斜长石（包括用该离子激活的合成材料）中的 Fe3+ 光谱非常相似。尽管与获得对比光谱的样品（30 mg）相比，样品量较小（5 mg）并且反照率较低，但借助数字信号平均器实现了光谱带的分辨率，使信噪比提高了八倍。将这些结果与来自同一核心但在几个不同深度的样品以及“内部”岩石（而不是角砾岩）样品组所获得的结果进行比较将是非常有启发性和非常有价值的，对于这些样品组，Fe3+发光中心可以相对较好地屏蔽环境影响，特别是那些与月球风化层中Fe0（金属）和Fe2+形成有关的影响。
Luminescence optical excitation spectroscopy carried out at room temperature on sample L24125 with light made monochromatic from a 450 W xenon source has shown that Fe3+ ions are present in the plagioclase component at concentrations such that the ligand field bands of this species are observed. The spectrum closely resembles that of Fe3+ in plagioclase-rich Apollo samples and in terrestrial calcic plagioclases, including synthetic material activated with this ion. Although the amount of sample was small (5 mg) compared with those for which comparison spectra were obtained (30 mg) and the albedo was lower, resolution of spectral bands was achieved with the aid of a digital signal averager, giving an eightfold enhancement of signal:noise ratio. It would be very instructive and of great value to compare these results with those obtained for samples from the same core but at several different depths and also with an ‘interior’ rock (as opposed to breccia) sample suite, for which the Fe3+ luminescence centres would be relatively well shielded from environmental influences, particularly those implicated in the formation of Fe0 (metal) and Fe2+ in the lunar regolith.