Vibrational spectroscopy of thin film condensates of ethanol mixture with inert gase

IF 0.2 Q4 PHYSICS, MULTIDISCIPLINARY Recent Contributions to Physics Pub Date : 2021-09-01 DOI:10.26577/rcph.2021.v78.i3.03
A. Aldiyarov, D. Sokolov, A. Tychengulova, D. Yerezhep
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Abstract

It is known that by changing the concentration in an inert medium, it is possible to form clusters of various sizes of any substance by condensing them on a cold substrate from the gas phase. Traditionally, such systems are presented by molecular cryocrystals. This paper demonstrates the results of IR spectro­metric studies of cryovacuum condensates of ethanol mixture with nitrogen. The main task of this study is to explain the complex, most often, ambiguous behavior of thin films of ethanol cryovacuum conden­sates in the process of its co­condensation with nitrogen. For this purpose, vibrational spectroscopy of cryodeposited thin films of “ethanol in nitrogen” mixtures in various concentration ratios was performed. The objects of research are thin films of cryocondensates of ethanol mixture with inert gas (N2). The sam­ples were condensed at the temperature T = 16 K. The pressure of the gas phase of the mixture during cryocondensation was kept at P = 10­5 Torr. The range of ethanol concentrations in the mixtures varied from 3% to 90%. The spectral range of measurements was considered in 400­-4200 1/cm. It is assumed that the change in the concentration of ethanol in the mixture leads to the formation of various cluster compositions of ethanol molecules dissolved in an inert medium.
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乙醇与惰性气体混合物薄膜凝聚物的振动光谱
众所周知,通过改变惰性介质中的浓度,可以通过将任何物质从气相冷凝到冷基底上而形成各种大小的团簇。传统上,这种系统是由分子冷冻晶体提供的。本文展示了乙醇与氮气混合物的低温真空冷凝物的红外光谱研究结果。本研究的主要任务是解释乙醇低温真空条件下薄膜在与氮气共缩合过程中的复杂、最常见的模糊行为。为此,对不同浓度比的“氮中乙醇”混合物的冷冻沉积薄膜进行了振动光谱分析。研究对象是乙醇与惰性气体(N2)混合物的冷凝物薄膜。样品在温度T=16K下冷凝。在冷冻冷凝过程中,混合物的气相压力保持在P=10-5Torr。混合物中乙醇浓度的范围从3%到90%不等。测量的光谱范围考虑为400­-4200 1/cm。假设混合物中乙醇浓度的变化导致溶解在惰性介质中的乙醇分子的各种团簇组成的形成。
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