| Project/Area Number |
04680001
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
プラズマ理工学
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| Research Institution | Tohoku University |
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Principal Investigator |
IINUMA Kouivhi Tohoku University, Department of Nuclear Engineering, Associate Proffesor, 工学部, 助教授 (40005484)
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| Co-Investigator(Kenkyū-buntansha) |
SATOH Yoshiyuki Tohoku University, Department of Nuclear Engineering, Assistant, 工学部, 助手 (00005480)
TAKEBE Masahiro Tohoku University, Department of Nuclear Engineering, Professor, 工学部, 教授 (30005392)
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| Project Period (FY) |
1992 – 1993
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| Project Status |
Completed (Fiscal Year 1993)
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| Budget Amount *help |
¥1,800,000 (Direct Cost: ¥1,800,000)
Fiscal Year 1993: ¥1,200,000 (Direct Cost: ¥1,200,000)
Fiscal Year 1992: ¥600,000 (Direct Cost: ¥600,000)
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| Keywords | Gas-phase ion chemistry / Mass spectrometer / Ion swarm / Cluster ion / Mobility / Diffusin coefficient / Ion / molecule reaction |
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| Research Abstract |
A purpose of the present research is to explore direct high pressure mass spectrometry for micro-cluster ions at atmospheric pressure, by resorting to the RF-filter newly developed. The idea lies in the fact that different masses of ions have different mobilities in the same neutral gas. In principle, ion separation by use of this filter is proved.
(1) Theoretical analysis for its design :
Based upon ion-swarm theory, we examine the transport coefficients and reaction rates of some ionic species in a gas. In this preliminary work we find an important information on dynamic equilibrium of reactive ion transport, which is reported on Canadian Journal of Chemistry.
(2) Design and performance of the RF-filter and construction of a drift-tube apparatus :
Three diferent types of RF-filters are produced and assembled in a new drift tube. Their transmission efficiencies for Li^+ ions in Ar are measured as functions both of the rf frequency and the applied electric field. This mases it crear that at higher frequencies the Li^+ ions can pass through the filter. We report it in the conference of The Physical Society of Japan as well as The Ion Swarm Seminar in Japan.
(3)Performance of the RF-filter at high pressure region and submission of an article :
Finally, we realize an RF-filter composed of eight parallel gold foils 0.05mm thick, 2.0mm wide, spaced by a 2.0mm gap. We test its workability by using Li^+・CO_2 system at p=0.2Torr, f=1MHz, and E=20Vcm^<-1>. When it operates most of the Li^+ ions can efficiently be trapped, while Li^<+\.>CO_2 cluster ions safely pass through it. This suggests a possiblility of direct mass spectrometry of ions at atmospheric pressure. An article, involving all these contents, is submitted to International Journal of Mass Spectrometry and Ion Processes.
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