Resolving RF mass spectrometer

Details Resolving RF mass spectrometer Resolving RF mass spectrometer

1997-10-27

2000-02-22

Berman, Jack I.

Radiant energy

Ionic separation or analysis

Methods

250292, H01J 4942

Patent

active

060283084

ABSTRACT:
A method of operating a mass spectrometer having a rod set, comprising: directing ions into the rod set, applying an unbalanced RF voltage to the rod set, and applying a low level resolving DC voltage, e.g. 0.3 to 15.5 volts, to the rod set, thus increasing the sensitivity of the mass spectrometer and also improving the resolution. Alternatively, instead of unbalancing the RF voltage on the rod set, suitably phased RF can be applied to an end lens spaced from the exit end of the rod set.

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U. Brinkman, Int. J. Mass Spectrom. Ion Phys. 9(1972) 161-166.
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P.H. Dawson, The Acceptance of the Quadrupole Mass Filter, International Journal of Mass Spectrometry and Ion Physics, vol. 17, 1975, Amsterdam NL, p. 423-445.

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