Radiant energy – Ionic separation or analysis – With sample supply means
Reexamination Certificate
2007-08-14
2007-08-14
Vanore, David (Department: 2881)
Radiant energy
Ionic separation or analysis
With sample supply means
C250S281000, C250S282000
Reexamination Certificate
active
11032376
ABSTRACT:
In a mass spectrometer, ions from an ion source pass through an inlet aperture into a vacuum chamber for transmitting prior to mass analysis by the mass analyzer. The configuration of the inlet aperture forms a sonic orifice or sonic nozzle and with a predetermined vacuum chamber pressure, a supersonic free jet expansion is created in the vacuum chamber that entrains the ions within the barrel shock and Mach disc. Once formed, an ion guide with a predetermined cross-section to essentially radially confine the supersonic free jet expansion can focus the ions for transmission through the vacuum chamber. This effectively improves the ion transmission between the ion source and the mass analyzer.
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Collings Bruce A.
Guna Mircea
Javaheri Hassan
Loboda Alexandre V.
Thomson Bruce A.
Applera Corporation
Karnakis Andrew T.
MDS Inc.
Vanore David
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