Method of increasing the dynamic range and sensitivity of a quad

Details Method of increasing the dynamic range and sensitivity of a quad Method of increasing the dynamic range and sensitivity of a quad

1987-05-22

1988-09-13

Anderson, Bruce C.

Radiant energy

Ionic separation or analysis

Methods

250283, 250290, 250291, 250292, 2502521, H01J 4942

Patent

active

047711728

ABSTRACT:
A method is disclosed for increasing the dynamic range and sensitivity of a quadrupole ion trap mass spectrometer operating in the chemical ionization mode. Prior to mass analysis, a prescan is performed with the ion trap and the ionization and reaction periods are adjusted to produce enough stored product or analyte ions to generate a good signal-to-noise ratio in the detection of trace amounts of analyte, yet not so many analyte ions that resolution in the mass spectrum is lost. A mass analysis scan is then performed with the ion trap using the ionization and reaction periods predetermined during the prescan.

REFERENCES:
patent: 3502867 (1970-03-01), Beauchamp
patent: 3937955 (1976-02-01), Comisarow et al.
patent: 4105917 (1978-08-01), McIver et al.
patent: 4464570 (1984-08-01), Allemann et al.
patent: 4535235 (1985-08-01), McIver
patent: 4540884 (1985-09-01), Stafford et al.
patent: 4686367 (1987-08-01), Louris et al.

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