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Corona Discharge Ion Mobility Spectrometry of Ten Alcohols
Hai-yan Han1, Hong-mei Wang1, Hai-he Jiang1, Michal Stano2, Martin Sabo2, Stefan Matejcik2, Yan-nan Chu*1
1.Laboratory of Environmental Spectroscopy, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;2.Department of Experimental Physics, Comenius University, Bratislava 84248, Slovak Republic
Abstract:
Ion mobility spectra for ten alcohols have been studied in an ion mobility spectrometry apparatus equipped with a corona discharge ionization source. Using protonated water cluster ions as the reactant ions and clean air as the drift gas, the alcohols exhibit different product ion characteristic peaks in their ion mobility spectra. The detection limit for these alcohols is at low concentration pmol/L level according to the concentration calibration by exponential dilution method. Based on the measured ion mobilities, several chemical physics parameters of the ion-molecular interaction at atmosphere were obtained, including the ionic collision cross sections, diffusion coefficients, collision rate constants,and the ionic radii under the hard-sphere model approximation.
Key words:  Reduced mobility, Hard-sphere model, Ion molecular collision parameters
FundProject:
Corona Discharge Ion Mobility Spectrometry of Ten Alcohols
韩海燕1, 王鸿梅1, 江海河1, Michal Stano2, Martin Sabo2, Stefan Matejcik2, 储焰南*1
1.中科院安徽光学精密机械研究所环境光谱学研究室,合肥230031;2.斯洛伐克柯美纽斯大学实验物理系,Bratislava 84248
摘要:
利用电晕放电离子源离子迁移谱装置对十种醇类有机物的迁移谱进行了研究. 在质子化的水合氢离子为反应离子和纯净空气为迁移气体的条件下,各种醇类有机物在其离子迁移谱中都获得了不同的产物离子峰. 利用指数稀释法得到各种样品的检测限在几个pmol/L量级. 利用所得到的离子迁移谱,以硬球碰撞为模型,得到了大气压下离子-分子相互作用的多个化学物理参数,包括离子分子碰撞、扩散系数、碰撞速率常数和离子半径.
关键词:  约化迁移率,硬球模型,离子-分子碰撞参数
DOI:10.1088/1674-0068/22/06/605-610
分类号: