Mass spectrometer

Details Mass spectrometer Mass spectrometer

1979-09-28

1981-03-17

Anderson, Bruce C.

Radiant energy

Ionic separation or analysis

Static field-type ion path-bending selecting means

250281, B01D 5944

Patent

active

042569630

ABSTRACT:
A linked scan type mass spectrometer wherein the mass number of a metastable ion originating from a precursor ion is measured by scanning the magnetic and electric fields at a constant ratio between the two fields. Calculation is performed on a first electrical signal representative of the mass number of the precursor ion, a second electrical signal corresponding to a value of the electric field at which the mass number of the precursor ion is detected, and a third electrical signal corresponding to a value of the electric field at which the metastable ion is detected during scanning of the electric field and magnetic field, to thereby determine the mass number of the metastable ion. The third electrical signal is obtained by measuring a value of the magnetic field which contributes to the dispersion of ions. Means is provided for correcting the measured value of the magnetic field, thereby determining the mass number of the metastable ion with high accuracy.

REFERENCES:
patent: 3475604 (1969-10-01), Noda et al.
patent: 3610921 (1971-10-01), Major
patent: 3689764 (1972-09-01), Green
patent: 3803410 (1974-04-01), Banner

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