Method of operating ion trap detector in MS/MS mode

Details Method of operating ion trap detector in MS/MS mode Method of operating ion trap detector in MS/MS mode

1990-03-27

1992-07-21

Berman, Jack I.

Radiant energy

Ionic separation or analysis

Cyclically varying ion selecting field means

250290, 250282, H01J 4942

Patent

active

RE0340006

ABSTRACT:
A simple and economical method of mass analyzing a sample by means of a quadrupole ion trap mass spectrometer in an MS/MS mode comprises the steps of forming ions within a trap structure, changing the RF and DC voltages in such a way that the ions with mass-to-charge ratios within a desired range will be and remain trapped within the trap structure, dissociating such ions into fragments by collisions and increasing the field intensity again so that the generated fragments will become unstable and exit the trap volume sequentially to be detected. A supplementary AC field may be applied additionally to provide various scan modes as well as dissociate the ions.

REFERENCES:
patent: 2939952 (1960-06-01), Paul et al.
patent: 3527949 (1970-09-01), Dawson et al.
patent: 4105917 (1978-08-01), McIver et al.
patent: 4540884 (1985-09-01), Stafford et al.
Fulford et al., Journal of Vacuum Science and Technology, 17(4) Jul./Aug. 1980, pp. 829-835.
Mather et al., Dynamic Mass Spectrometry, vol. 5, ed. Price et al., 1978, pp. 71-84.
Todd et al., "Quadrupole Ion Traps", Quadrupole Mass Spectrometry and its Applications, ed. Dawson, 1976, pp. 181-224.
Dawson, Quadrupole Mass Spectromety and its Applications, 1976, pp. 4-6.
Rettinghaus Z. Angew Phys. 22 (1967), pp. 321-326.
Fischer, Z. Phys. 156 (1959), pp. 1-26.

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