Ionization analysis method and device
| Foreign code | F110005748 |
|---|---|
| File No. | P08-019EP |
| Posted date | Sep 13, 2011 |
| Country | EPO |
| Application number | 09770022 |
| Gazette No. | 2295959 |
| Gazette No. | 2295959 |
| Date of filing | Jun 4, 2009 |
| Gazette Date | Mar 16, 2011 |
| Gazette Date | Apr 6, 2016 |
| International application number | JP2009060653 |
| International publication number | WO2009157312 |
| Date of international filing | Jun 4, 2009 |
| Date of international publication | Dec 30, 2009 |
| Priority data |
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| Title | Ionization analysis method and device |
| Abstract |
It is arranged so that ions can be analyzed accurately and with high sensitivity. A first electrode 11 is provided on the outer periphery of a dielectric cylindrical body 13 and a second electrode 12 is placed inside the cylindrical body 13 leaving a clearance between itself and the inner surface of the cylindrical body 13. When an AC high voltage is impressed across the first electrode 11 and second electrode 12, a barrier discharge occurs within the cylindrical body 13. When a distal end portion 12a of the second electrode 12 projects outwardly from the distal end of the cylindrical body 13, a thermal equilibrium plasma P having a low electron temperature is generated outwardly of the distal end of the cylindrical body 13 without a plasma jet ascribable to the barrier discharge emerging outwardly from the distal end of the cylindrical body 13. By exposing a sample S to the thermal equilibrium plasma P, particles (atoms, molecules) desorbed from the sample S undergo soft ionization without being decomposed or polymerized. The ions generated are introduced to a mass analyzer 50. |
| Scope of claims |
[claim1] 1. An ionization apparatus comprising: a first cylindrical body comprising a dielectric; a first electrode provided on the outer side of said first cylindrical body in the vicinity of a distal end portion thereof; and a second electrode disposed inside said first cylindrical body in the vicinity of the center thereof defining a clearance between itself and an inner surface of said first cylindrical body, extending along the longitudinal direction of said first cylindrical body ; wherein said second electrode is a second cylindrical body for supplying a sample gas or for introducing generated ions and has a distal end that is open; characterised in that said second electrode projects outwardly from the distal end of said cylindrical body passing a position at which said first electrode is provided. [claim2] 2. An ionization apparatus according to claim 1, wherein said second electrode is a slender tube made of metal. [claim3] 3. An ionization apparatus according to claim 1, wherein said second electrode is a capillary for supplying a sample gas, the sample gas being supplied from a rear end thereof. [claim4] 4. An ionization apparatus according to claim 1, wherein said second electrode is a capillary for introducing ions, the capillary communicating with the interior of a mass analyzer. [claim5] 5. An ionization apparatus according to claim 1, wherein said second electrode is formed as a metal portion on the surface of an inner cylindrical body, which exhibits an insulating property, at least from the position of said first electrode to the distal end. [claim6] 6. An ionization apparatus according to any one of claims 1 to 5, further comprising a mesh electrode disposed outwardly of a distal end of said second electrode in close proximity to this distal end. [claim7] 7. An ionization analysis apparatus comprising the ionization apparatus, which is set forth in any one of claims 1 to 6, and a mass analyzer. [claim8] 8. An ionization method using the ionization apparatus set forth in any one of claims 1 to 6 comprising: impressing an AC voltage across said first and second electrodes; and exposing a sample to a charged gas stream generated from the distal end of said first cylindrical body. [claim9] 9. An ionization method according to claim 8, further comprising impressing a DC voltage across said first and second electrodes and generating a positive-ion rich or negative-ion rich charge gas current in accordance with polarity of this DC voltage. [claim10] 10. An ionization method according to claim 9, further comprising applying a voltage having a polarity the same as that of said DC voltage and an absolute value larger than that of said DC voltage to a conductor placed rearwardly of the sample. [claim11] 11. An ionization method according to claim 8, further comprising applying a positive or negative DC voltage to a mesh electrode disposed outwardly of the distal end of said second electrode in close proximity to this distal end. [claim12] 12. An ionization method according to any one of claims 8 to 11, further comprising spraying fine droplets of a solvent onto the sample and promoting desorption of the sample. [claim13] 13. An ionization method according to any one of claims 8 to 11, further comprising promoting desorption of the sample by heating the sample. [claim14] 14. An ionization method according to any one of claims 8 to 11, further comprising promoting desorption of the sample by irradiating the sample with laser light. [claim15] 15. An ionization analysis method comprising introducing sample ions, which have been produced by the ionization method set forth in any one of claims 8 to 14, to an analyzing apparatus. |
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| Specified countries | Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK TR |
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Contact Information for " Ionization analysis method and device "
- University of Yamanashi Center for Social Collaboration and Intellectual Property Management
- URL: https://www.scrs.yamanashi.ac.jp/
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E-mail:
- Address: 4-4-37, Takeda, Kofu, Yamanashi, Japan , 400-8510
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