共查询到19条相似文献,搜索用时 484 毫秒
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介绍了自行研制的基于叠型场线性离子阱的便携式质谱仪结构,以及初步的应用测试。该质谱仪的质量分析器采用叠型场线性离子阱,离子源采用辉光放电电子轰击电离源和介质阻挡放电离子源。仪器重10 kg,功耗低于100 W,体积33 cm×20 cm×20 cm,可以对气体、固体和液体进行检测。挥发性有机气体通过膜进样接口实现大气压直接进样,采用内置的辉光放电电子轰击电离源对其电离。介质阻挡放电离子源作为大气压离子源,通过非连续大气压接口实现质谱的大体积进样,及对枪击残留物DDU和去痛片等的快速检测。 相似文献
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G. G. Sikharulidze 《Instruments and Experimental Techniques》2009,52(2):242-244
To perform direct elemental analysis of solids, it is proposed to complement an Element 2 ICP mass spectrometer commercially
produced by Thermo Electron Corp. with a glow-discharge ion source based on a hollow cathode. The analyzed sample, in the
form of a rod 1.0–2.5 mm in diameter and 15–20 mm in length, is set along the axis of the cathode cavity with an inner diameter
of 15–16 mm and a depth of 15 mm. The cathode is placed in a discharge chamber, which, using a viton seal, is substituted
for the ICP-source sampler. The use of a plasma mirror and getter evacuation of the source chamber allows a decrease in the
source’s hydrocarbon background by a factor of 103–104. The ion source is evacuated by a mechanical pump of the mass spectrometer and an additional turbomolecular pump. Ion sources
in a mass spectrometer are replaced (a change from one analytical method to another) within 5 min. The ion current extracted
from the IS allows analysis of conducting solids with a sensitivity at a level of several ppb (10−7%) at a resolution of the mass spectrometer of 4000. Combining two easily replaceable ICP and GD ion sources in a single high-resolution
analyzer significantly extends the analytical capabilities of the Element 2 mass spectrometer.
Original Russian Text ? G.G. Sikharulidze, 2009, published in Pribory i Tekhnika Eksperimenta, 2009, No. 2, pp. 98–100. 相似文献
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Conventional quantitative analysis of SIMS is based on the calibration with standards. In this paper, some impurities in Aluminum bulk material were quantitatively analyzed using natural abundance of the isotope and known relative secondary ion yield of the elements. The analysis results are compared with the results of other quantitative analysis techniques, such as atomic emission spectrometer and glow discharge mass spectrometer(GDMS). 相似文献
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The performance of a cubical permanent magnet generated line-cusp ion source has been investigated for use with neutral beam injectors. This source has been operated with discharge currents greater than 500 A and ion current densities higher than 400 mA/cm2 at the extraction grid. The uniformity of the density profile across the extraction area is found to be dependent on the gas pressure. By using a fast Langmuir probe sweeping circuit, the electron temperature and the plasma density and potential have been analyzed for different discharge powers and gas pressures. The heat load on the plasma grid when it is electrically floating or connected to the negative cathode has been compared calorimetrically. The use of lanthanum hexaboride and impregnated oxide cathodes have been investigated for the purpose of long pulse operation. The phenomenon of mode flipping is found to occur quite frequently during a discharge with these magnetic-field-free cathodes. Species composition as a function of discharge power and chamber length is measured by a mass spectrometer. 相似文献
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瞬短脉冲辉光放电飞行时间质谱仪 总被引:2,自引:1,他引:2
本文介绍了本实验室研制的瞬短脉冲辉光放电飞行时间质谱仪。其中,辉光放电离子源具有离子产额高、工作稳定可靠等特点,可用于对金属(合金)样品的直接分析。该仪器为国内首台自制的常压(低真空)等离子体飞行时间质谱仪,亦为国际上首台瞬短脉冲辉光放电质谱仪,为研究瞬短脉冲辉光放电及其应用这一新兴领域打下了基础,仪器的分辨本领优于500。 相似文献