Title:
ION TRANSPORT APPARATUS AND MASS SPECTROSCOPE EMPLOYING SAID APPARATUS
Document Type and Number:
WIPO Patent Application WO/2014/203305
Kind Code:
A1
Abstract:
In the interior of an intermediate vacuum chamber (2) in the subsequent stage from an ionization chamber (1) which is an atmospheric pressure environment, an electrode group (20A) of a high-frequency carpet (20) in which a plurality of ring-shaped electrodes are arranged in concentric circles is arranged such that the center axis of a skimmer (7) aligns to the front side thereof with the center axis of an ion passage hole (7a). Each ring-shaped electrode has a diametrical cross sectional shape which is circular. High frequency voltages of reversed phase are applied to diametrically adjacent ring-shaped electrodes, and different direct current voltages are applied to the ring-shaped electrodes in such a way as to form a downward sloping potential from the outside peripheral side to the inside peripheral side. Due to the circular cross sectional shape of the electrodes, the slope of the pseudopotential formed in proximity to the electrodes is large, and therefore the repulsive force acting to distance the ions from the electrodes is large. As a result, as compared with conventional structures having a flat rectangular cross sectional shape, ion loss can be minimized, and ion collection efficiency and transport efficiency, particularly in an area of a relatively low degree of vacuum, can be increased, improving the sensitivity of mass spectrometry.
Inventors:
NISHIGUCHI MASARU (JP)
IMAZU AKIKO (JP)
SAKAE HIROKI (JP)
IMAZU AKIKO (JP)
SAKAE HIROKI (JP)
Application Number:
PCT/JP2013/066564
Publication Date:
December 24, 2014
Filing Date:
June 17, 2013
Export Citation:
Assignee:
SHIMADZU CORP (JP)
International Classes:
H01J49/06; H01J49/42
Foreign References:
| JP2010527095A | 2010-08-05 | |||
| JP2011529623A | 2011-12-08 | |||
| JP2000149865A | 2000-05-30 | |||
| JP2009266656A | 2009-11-12 | |||
| JP2011249109A | 2011-12-08 | |||
| JP2011146287A | 2011-07-28 | |||
| JP2009535759A | 2009-10-01 | |||
| US6107628A | 2000-08-22 |
Attorney, Agent or Firm:
Kyoto International Patent Law Office (JP)
Patent business corporation Kyoto international patent firm (JP)
Patent business corporation Kyoto international patent firm (JP)
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