Radiant energy – Ionic separation or analysis – With sample supply means
Patent
1996-04-15
1997-01-21
Berman, Jack I.
Radiant energy
Ionic separation or analysis
With sample supply means
250281, 250282, H01J 4904
Patent
active
055961924
ABSTRACT:
A mass spectrometric apparatus receives a liquid sample from a liquid chromatograph, ionizes it under an atmospheric condition and guides these ions from the liquid sample along a specified trajectory through one or more intermediate vacuum chambers to a mass analyzer kept inside a high vacuum chamber. At least one of these intermediate vacuum chambers is kept in an intermediate vacuum condition in the so-called viscous flow region and contains at least one pair of mutually separated planar electrodes sandwiching the trajectory. Voltages of the same polarity as that of the ions which are passed through are adjustably applied to the electrodes so as to form a converged ion beam and also to control its trajectory. Two mutually perpendicular pairs of such electrodes may be disposed across the trajectory. Two sets each with two such pairs of electrodes may be disposed across the trajectory.
REFERENCES:
patent: 4300044 (1981-11-01), Iribarne et al.
patent: 5157260 (1992-10-01), Mylchreest et al.
patent: 5164592 (1992-11-01), Kitamori et al.
patent: 5432343 (1995-07-01), Gulcicek et al.
Berman Jack I.
Nguyen Kiet T.
Shimadzu Corporation
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