首页> 外文期刊>Russian Journal of Physical Chemistry >Structure of Aldehyde Cluster Ions in the Gas Phase, According to Data from Ion Mobility Spectrometry and Ab Initio Calculations
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Structure of Aldehyde Cluster Ions in the Gas Phase, According to Data from Ion Mobility Spectrometry and Ab Initio Calculations

机译:根据离子迁移谱和从头算的数据,气相中醛簇离子的结构

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摘要

Ion-mobility spectra of a set of aliphatic linear aldehydes with the number of carbon atoms from 3 to 7 are obtained. Values of the mobility corresponding to two most intense peaks, considered to be those of a monomer and dimer, are determined according the spectra. Based on mobility, collision cross sections are calculated using the Mason-Schamp equation. The linear increase in the collision cross sections upon an increase in molecular weight is determined. According to the experimental results, the contribution to the cross section that has no dependence on molecular weight diminishes with the formation of dimers. It is established using quantum chemical calculations that this is associated with a reduction in the dipole moment upon the formation of dimers.
机译:获得了一组碳原子数为3至7的脂肪族线性醛的离子迁移谱。根据光谱确定对应于两个最强峰的迁移率值,认为这是单体和二聚体的峰。基于迁移率,使用Mason-Schamp方程计算碰撞截面。确定了随着分子量的增加碰撞截面的线性增加。根据实验结果,对不依赖分子量的截面的贡献随着二聚体的形成而减小。使用量子化学计算可以确定,这与二聚体形成时偶极矩的减少有关。

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