Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means
Patent
1989-07-13
1991-03-05
Berman, Jack I.
Radiant energy
Ionic separation or analysis
Static field-type ion path-bending selecting means
250298, 250300, 250396R, 250397, H01J 4932
Patent
active
049980157
ABSTRACT:
There is disclosed a mass spectrometer capable of multiple simultaneous detection. The operation mode of the instrument can be switched between a mode in which a wide mass range is obtained and another mode in which high resolution is obtained. The spectrometer includes a mass analyzer having at least a sector magnetic field and a two-dimensional ion detector placed along a focal plane of the analyzer. The detector detects simultaneously ions focused and dispersed by the analyzer according to mass-to-charge ratio. A lens means having variable magnitude is disposed in the ion path between the magnetic field and the detector. A position-adjusting means places the detector along the focal plane which differs, depending upon the magnitude of the lens means. There is further disclosed a mass spectrometer which is capable of multiple simultaneous detection and includes said lens means and a lens magnitude-varying means. In this instrument, the lens means consists of two quadrupole lenses arranged in series. The lens magnitude-varying means causes the quadrupole lenses to assume one of predetermined sets of magnitudes such that the intersection of the central orbit or ions and the ion focal plane is not moved, irrespective of changes in the magnitudes of the lenses. A rotating mechanism is needed to rotate the detector about the intersection. The rotating mechanism can be dispensed with by using a sextupole lens in conjunction with the quadrupole lenses.
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Berman Jack I.
Jeol Ltd.
Nguyen Kiet T.
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