Method of mass analyzing a sample by use of a quadrupole ion tra

Details Method of mass analyzing a sample by use of a quadrupole ion tra Method of mass analyzing a sample by use of a quadrupole ion tra

1982-12-29

1985-09-10

Anderson, Bruce C.

Radiant energy

Ionic separation or analysis

Methods

250286, 250288, 250292, B01D 5944

Patent

active

045408840

ABSTRACT:
In a quadrupole ion store or ion trap type mass spectometer, significantly improved mass selection is achieved by simultaneously trapping ions within the mass range of interest and then scanning the applied RF and DC voltages or the frequency .omega. to sequentially render unstable trapped ions of consecutive specific masses. These are passed out through apertures in an end cap to a high gain electron multiplier to provide a signal indicative of the ion mass. Sensitivity and mass resolution is also enhanced by operating the ion trap at a relatively high pressure in the range 1.times.10.sup.-1 to 1.times.10.sup.-5 torr. The presence of collision gas molecules, such as helium, improves sensitivity and mass resolution. In addition, the structure itself is built of stacked units, sealed by O-rings, which are easily disassembled for cleaning.

REFERENCES:
patent: 2939952 (1960-06-01), Paul et al.
patent: 3527939 (1970-09-01), Dawson et al.
patent: 3742212 (1973-06-01), McIver
patent: 4105917 (1978-08-01), McIver et al.
Quadrupole Mass Spectrometry and its Applications, edited by P. H. Dawson, published by Elsevier 1976, pp. 4-6, 181-224.
Dynamic Mass Spectrometry, vol. 5, edited by Price and Todd, Heyden and Son, 1978, pp. 71-85.
Chemistry in Britain 1972, pp. 373-380.

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