Mass spectrometric apparatus

Details Mass spectrometric apparatus Mass spectrometric apparatus

1994-03-21

1995-06-06

Berman, Jack I.

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

250290, H01J 4942

Patent

active

054224829

ABSTRACT:
A mass spectrometric apparatus is disclosed which has quadrupole electrodes to which a DC voltage and a high-frequency voltage are applied in a superposed manner, and measures a mass spectrum by scanning particular mass numbers of ions passing through respective stable regions by changing the DC voltage and the high-frequency voltage in very small steps every predetermined time interval step while keeping a relationship in magnitude between the DC voltage and the high-frequency voltage in the stable regions which provide stable trajectories of the ions of the respective mass numbers. The mass spectrometric apparatus is further provided with control means for changing the relationship in magnitude between the DC voltage and the high-frequency voltage so that a part of the stable regions is changed to a divergent region in which ions of the particular mass numbers diverge and are prevented from passing through the quadrupole electrodes, the part of the stable regions corresponding to a particular mass number or mass range.

REFERENCES:
patent: 3784814 (1974-01-01), Sakai et al.
patent: 5177359 (1993-01-01), Hiroki et al.
patent: 5227629 (1993-07-01), Miseki
"Quadrupole Mass Spectrometer, its Principle and Applications" (in Japanese), Kodansha Ltd., Publishers, 1984, pp. 4-11 (see Specification p. 1).

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