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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
  • 2009JP060653 (Jun 4, 2009) WO
  • P2008-169679 (Jun 27, 2008) JP
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.
  • Applicant
  • UNIVERSITY OF YAMANASHI
  • Inventor
  • HIRAOKA KENZO
  • CHEN LEE CHUIN
IPC(International Patent Classification)
U.S. Cl./(Sub)
  • H01J049/10B
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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