Adsorption of Organic Isomers on Water Ice Surfaces: A Study of Acetic Acid and Methyl Formate
Adsorption of Organic Isomers on Water Ice Surfaces: A Study of Acetic Acid and Methyl Formate
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有机异构体在水冰表面的吸附：乙酸和甲酸甲酯的研究
DOI：
10.1021/jp201487u
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发表时间：
2011
影响因子：
3.7
通讯作者：
J. Fillion
中科院分区：
文献类型：
--
作者：
M. Bertin;C. Romanzin;X. Michaut;P. Jeseck;J. Fillion
在80-200K温度范围内，用程序升温脱附和红外光谱研究了冰面上两种异构体--醋酸(CH3COOH)和甲酸甲酯(HCOOCH3)的吸附行为。对于每一种化合物，区分了多层和亚单层吸附体系。在多层膜区域，分析了吸附分子的吸附构象随样品温度的变化，提供了相变和相关的热脱附的识别。在亚单分子层区，各异构体的吸附行为不同。醋酸第一层与水底物本身同时脱附，而甲酸甲酯单层脱附发生在水升华开始的15K以下。讨论了这种吸附能的差异，并与每个异构体与悬垂的O-H表面水键进行氢键的能力有关。这种差动吸附过程……
The adsorption of two isomers, acetic acid (CH3COOH) and methyl formate (HCOOCH3), on water ice surfaces is investigated using temperature-programmed desorption and infrared spectroscopy in the 80–200 K temperature range. For each compound, multilayer and submonolayer adsorption regimes are distinguished. In the multilayer regime, the adsorption conformations of the adlayer molecules as a function of the sample temperature are analyzed, providing the identification of phase transitions and associated thermal desorptions. In the submonolayer regime, different behaviors are found in the adsorption of each isomer. The acetic acid first layer desorbs simultaneously with the water substrate itself, whereas the methyl formate monolayer desorption is found 15 K below the onset of water sublimation. This difference in adsorption energies is discussed and associated with the ability of each isomer to perform hydrogen bonding with the dangling O–H surface water bonds. Such a differential adsorption process between ...