Radiant energy – Ionic separation or analysis
Patent
1990-03-22
1991-03-12
Anderson, Bruce C.
Radiant energy
Ionic separation or analysis
250288, H01J 4926
Patent
active
049994921
ABSTRACT:
An apparatus for carrying out inductively coupled plasma mass spectrometry to effect identification and quantification of a trace element contained in a sample solution. A plasma torch is provided for converting the sample solution into a plasma. A sampling interface has a sampling orifice and a skimmer orifice for drawing therethrough the plasma to form an ion beam. A mass filter is provided for effecting mass-separation of the ion beam to filter ions. A detector detects ions which pass through the mass filter. An optical system is composed of a lens, a deflector and a junction member for efficiently introducing the ion beam from the sampling interface into the mass filter. An ammeter is connected to the junction member between the optical system and the mass filter. A monitoring device is provided for monitoring the state of the ion beam within the optical system according to the output of the ammeter and an adjusting device is provided for adjusting the optical system while monitoring the output of the ammeter and an output of the detector.
REFERENCES:
patent: 4682026 (1987-07-01), Douglas
patent: 4746794 (1988-05-01), French et al.
patent: 4760253 (1988-07-01), Hutton
patent: 4812040 (1989-03-01), Marcus et al.
Anderson Bruce C.
Seiko Instruments Inc.
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