Mass chromatograph

Details Mass chromatograph Mass chromatograph

2006-06-20

2006-06-20

Wells, Nikita (Department: 2881)

Radiant energy

Ionic separation or analysis

With sample supply means

C250S281000, C250S282000, C250S42300F

Reexamination Certificate

active

07064320

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.

REFERENCES:
patent: 6686592 (2004-02-01), Sakairi et al.
patent: 6852970 (2005-02-01), Yamada et al.
patent: 6-310091 (1993-04-01), None
patent: 9-15207 (1995-06-01), None
patent: 11-295269 (1998-04-01), None
patent: 2001-93461 (1999-09-01), None
Good, A., et al., “Ion-Molecule Reactions in Pure Nitrogen and Nitrogen Containing Traces of Water at Total Pressures 0.5-4 torr. Kinetics of Clustering Reactions Forming H (H2O)”, The Journal of Chemical Physics, vol. 52, No. 1, Jan. 1970, pp. 212-221.

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