US 7,064,320 B2Granted

Mass chromatograph

AssigneeHitachi, Ltd.

InventorsMasuyoshi Yamada, Izumi Waki, Hideo Kasima

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Abstract

A mass spectrometer has an atmospheric pressure chemical ionization source that includes a first ionization portion including a needle electrode, for generating a primary ion by discharge of the needle electrode a primary ion introduction aperture, and a second ionization portion including an introduction aperture, for generating a sample ion by the reaction between the primary ion and the sample gas introduced from an end of a column of gas chromatography, a sample ion movement aperture; and a mass analysis portion; wherein the end is arranged at a position satisfying the relation r≦2R where R is a radius of an inner diameter of the aperture and r is a distance between an axis connecting the center of the aperture and the center of the aperture, and the end.

Claims13

Dependent claims

A mass spectrometer comprising:

an atmospheric pressure chemical ionization (APCI) source including:
(a1) a first ionization portion including a needle electrode to which a voltage for corona discharge is applied, and an exhaust aperture for said primary ion generation gas, for generating a primary ion from said primary ion generation gas by discharge of said needle electrode;
(a2) a primary ion introduction aperture through which said primary ion flows;
and
(a3) a second ionization portion including an introduction aperture of said primary ion generation gas, for generating a sample ion of a sample gas by the reaction between said primary ion introduced from said primary ion introduction aperture and said sample gas introduced from an end of a column of gas chromatography, said second ionization portion having the end of said column arranged therein;
(b) a sample ion movement aperture through which said sample ion moves;
and
(c) a mass analysis portion for conducting mass analysis of said sample ion;
wherein:
said exhaust aperture is arranged at a portion on the opposite side to the tip end of said needle electrode, said primary ion generation gas introduced into said second ionization portion is caused to flow to said exhaust aperture from the distal end of said needle electrode through said primary ion introduction aperture, and the end of said column is arranged at a position satisfying the relation r≦2R where R is a radius of an inner diameter of said primary ion introduction aperture and r is a distance between an axis connecting the center of said primary ion introduction aperture and the center of said sample ion movement aperture, and end of said column.

7 more elements

A mass spectrograph comprising:

an atmospheric pressure chemical ionization (APCI) source including:
(a1) an ionization portion including a needle electrode to which a voltage for corona discharge is applied, and a primary gas generation gas introduction aperture, generating a primary ion from said primary ion generation gas by discharge of said needle electrode, having a column of gas chromatography disposed therein and generating the sample ion of said sample gas by the reaction between said sample gas introduced from an end of said column and said primary ion;
(a2) an ion passage aperture through which said sample ion, said primary ion, said primary ion generation gas and said sample gas flow;
and
(a3) an area into which said sample ion, said primary ion, said primary ion generation gas and said sample gas are introduced through said ion passage aperture;
(b) a sample ion movement aperture through which said sample ion moves;
and
(c) a mass analysis portion for conducting mass analysis of said sample ion;
wherein the end of said column is arranged between the tip end of said needle electrode and said ion passage aperture.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/071,345Filed 4 Mar 2005
Priority: JP 2004-26911216 Sep 2004
Published: US 2006/0054806 A116 Mar 2006
Granted: 20 Jun 2006
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H01J 49/0422
Arrangements for introducing or extracting samples to be analysed, e.g. vacuum locks; Arrangements for external adjustment of electron- or…: for…
G01N 30/7213
Interfaced to gas chromatograph: splitting of the gaseous effluent
H01J 49/145
Using particle bombardment, e.g. ionisation chambers: using chemical ionisation
H01J 49/168
Using surface ionisation, e.g. field-, thermionic- or photo-emission: field ionisation, e.g. corona discharge