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HYPERTHERMAL SURFACE IONIZATION DETECTOR FOR GAS-CHROMATOGRAPHY

用于气相色谱的高温表面电离检测器

基本信息

批准号：
03804045
负责人：
KISHI Hiroshi
金额：
$ 1.28万
依托单位：
Oyama National College of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1991
资助国家：
日本
起止时间：
1991 至 1993
项目状态：
已结题

项目摘要

An experimental study was performed on the influence of the molecular kinetic energy in surface ionization, using Rhenium oxide(ReO_2) or Platinum(Pt) surfaces. Sample molecules were benzene, toluene, o-xylene, and piperidine. They were accelerated to kinetic energies of 5-15 eV by means of seeded supersonic molecular beam method. These accelerated molecules, expanded from a nozzle, were brought to interact with a heated surface by collision, forming positive ions of intact molecules or its fragments.Ionization yield was measured as a function of incident kinetic energy, surface temperature, and system parameters. The ionization yield was increased exponentially above the threshold kinetic energy. This threshold energy was nearly equal to the energy gap phi-IE, werer phi is the work function of the surface and IE is the ionization energy of the organic molecule. The organic molecules were sensitive to the surface temperature, in terms of the ionization efficiency.A home made detector for gas-chromatography with use of this ionization principle was evaluated its function, by comparison with the commercial FID-detector. The evaluated functions were the detection sensitivity, noise level, background level, dynamic range, peak width and the other system parameters. Our detector using Rhenium oxide surface showed excellent detection sensitivity, which was nearly 100 times higher than FID-detector for various kinds of the organic molecules. Noise level and peak width were comparable to those of FID-detector. On the other hand, the dynamic range and the background level stability were poorer than those of FID-detector.

本文用氧化铼（ReO_2）和铂（Pt）表面对分子动能对表面电离的影响进行了实验研究。样品分子为苯、甲苯、邻二甲苯和哌啶。用种子超声分子束方法将它们加速到5-15 eV的动能。这些被加速的分子从喷嘴中膨胀出来，通过碰撞与加热的表面相互作用，形成完整分子或其碎片的正离子，电离产额被测量为入射动能、表面温度和系统参数的函数。电离产率在阈值动能以上呈指数增加。该阈值能量几乎等于能隙φ-IE，其中φ是表面的功函数，IE是有机分子的电离能。有机分子的电离效率对表面温度很敏感，利用这种电离原理研制了一种气相色谱检测器，并与商品FID检测器进行了性能比较。评价函数为检测灵敏度、噪声水平、背景水平、动态范围、峰宽等系统参数。我们的探测器使用氧化铼表面表现出良好的检测灵敏度，这是近100倍以上的FID检测器的各种有机分子。噪声水平和峰宽与FID检测器相当。另一方面，动态范围和背景电平稳定性比FID检测器差。