Institute of Geochemistry, Mineralogy and Mineral Resources, Charles University in Prague, Prague, Czech Republic.
Spectrochim Acta A Mol Biomol Spectrosc. 2011 Oct;80(1):32-5. doi: 10.1016/j.saa.2011.01.003. Epub 2011 Jan 12.
Recently, portable Raman instrumentation has been in demand for geosciences and for future planetary exploration for the identification of both organic and inorganic compounds in situ on Earth and on other planetary bodies, especially on Mars. Here we present the results of the analysis of halite/β-carotene and halite/mellitic acid mixtures, performed by miniaturized Raman instrumentation equipped with 785 and 1064 nm excitation. Various proportions of organics in the halite matrix were examined. The lowest concentration of β-carotene detected using the 785 nm laser was 1 mg kg(-1), with slightly better signals observed with shorter exposure times compared with the bench instrument using the same excitation wavelength. Mellitic acid was identified at the concentration level 10 g kg(-1). The 1064 nm excitation provided a lower sensitivity towards low concentration when compared with the 785 nm excitation.
最近，便携式拉曼仪器在地球科学和未来的行星探测中受到了需求，以用于在现场识别有机和无机化合物，无论是在地球上还是在其他行星体上，特别是在火星上。在这里，我们展示了使用配备 785nm 和 1064nm 激发源的小型化拉曼仪器对岩盐/β-胡萝卜素和岩盐/均苯三甲酸混合物进行分析的结果。我们研究了岩盐基质中不同比例的有机物。使用 785nm 激光检测到的β-胡萝卜素最低浓度为 1mgkg-1，与使用相同激发波长的台式仪器相比，较短的曝光时间可以观察到稍好的信号。在 10gkg-1的浓度水平下可以识别出均苯三甲酸。与 785nm 激发相比，1064nm 激发对低浓度的灵敏度较低。
