Method of operating a mass spectrometer including a low level re

Details Method of operating a mass spectrometer including a low level re Method of operating a mass spectrometer including a low level re

1997-10-31

1999-12-07

Anderson, Bruce C.

Radiant energy

Ionic separation or analysis

Methods

250288, 250292, B01D 5944, H01J 4900

Patent

active

059987871

ABSTRACT:
A method is provided of operating a mass spectrometer having first and second rod sets, which can be a focusing set of rods and an analysis rod set, the second rod set being downstream from the first rod set at an outlet of a spectrometer. Ions are directed into the first rod set and an RF voltage applied to the two rod sets, the RF voltage can be the same or different for the two rod sets. A low level DC voltage is applied to the first rod set sufficient to reduce a continuum background ion signal, thereby to increase the signal-to-noise ratio of the spectrometer.

REFERENCES:
patent: 4090075 (1978-05-01), Brinkmann
patent: 4189640 (1980-02-01), Dawson
patent: 4328420 (1982-05-01), French
patent: 4329582 (1982-05-01), French et al.
patent: 4535235 (1985-08-01), Mciver
patent: 4963736 (1990-10-01), Douglas et al.
patent: 5179278 (1993-01-01), Douglas
patent: 5739530 (1998-04-01), Franzen et al.

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