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Laser micro Raman investigations on gas hydrates

机译:激光微拉曼研究气体水合物

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Laser Raman spectroscopic measurements for some hydrocarbon gas molecules (propane and methane) have been reported on laboratory-synthesized hydrates in India. Our results corroborate the literature data, thus providing good laboratory standards. Such measurements are vital while analysing natural samples, where the guest molecules could be methane, ethane, propane, etc. The present results also demonstrate that the Raman mode around 60 cm(-1) is a characteristic feature for structure-II hydrates. Gas hydrates with mixed guest molecules (tetrahydrofuran (THF) and methane) were also probed by Raman spectroscopy. The observed Raman spectra clearly indicate that the methane molecules occupy smaller cages upon using THF and water in 1: 17 mol ratio. However, the Raman signatures for both large and small cages, in structure-II, are clearly seen using water mixed with lesser amount of THF.
机译:在印度,实验室合成的水合物已经报道了一些烃类气体分子(丙烷和甲烷)的激光拉曼光谱测量。我们的结果证实了文献数据,从而提供了良好的实验室标准。在分析天然样品(宾客分子可能是甲烷,乙烷,丙烷等)的自然样品时,此类测量至关重要。本结果还证明,60 cm(-1)附近的拉曼模式是II型结构水合物的特征。还通过拉曼光谱法检测了具有混合客体分子(四氢呋喃(THF)和甲烷)的气体水合物。观察到的拉曼光谱清楚地表明,在以1:1摩尔比使用THF和水时,甲烷分子占据的笼子较小。但是,使用水和少量THF混合后,可以清楚地看到结构II中大型和小型笼子的拉曼特征。

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