Tandem quadrupole mass spectrometer for selected ion fragmentati

Details Tandem quadrupole mass spectrometer for selected ion fragmentati Tandem quadrupole mass spectrometer for selected ion fragmentati

1978-11-13

1980-11-18

Dixon, Harold A.

Radiant energy

Ionic separation or analysis

250284, 250296, 250423R, B01D 5944

Patent

active

042347912

ABSTRACT:
A tandem quadrupole-based mass spectrometer including a highly efficient intermediate fragmentation stage. The disclosed fragmentation stage employs collision-induced dissociation (CID), in an electrodynamic focus device, which may be a quadrupole operated in a broad band filter mode. The disclosed CID process occurs at low energy (e.g., less than 1 keV, but preferably 2 eV to 100 eV), and is quite different from the high energy (e.g, greater than 1 keV, and typically 3 keV to 10 keV) CID process in prior tandem instruments such as mass-analyzed ion kinetic energy spectrometry (MIKES) systems. The efficiency of the present CID fragmentation is as high as 65%.

REFERENCES:
patent: 4024217 (1977-05-01), Wexler et al.
patent: 4037100 (1977-07-01), Purser
"Ionic Reactions in Monosilane" by Yu et al., Physical Chemistry vol. 76 Nov.-Dec. 1972 pp. 3321-3330.
"Photodissociation of CH.sub.3 Cl.sup.+ & CH.sub.3 Br.sup.+. . " by Vestal et al., Chemical Physics Letters Vol. 28, No. 4, Oct. 15/74 pp. 559-561.
"Improvement of Resolution . . . " by Tuithoe Int. Jour. of Mass Spectrometry & Ion Physic Vd. 23 1977 pp. 147-151.
"Collisional Activation Mass Spectrometer . . . " by Levsen et al., Angewandte Chemie vol. 15 No. 9, Sep. 76 pp. 509-518.
"Photofragment Spectrometer" by Busch et al., Review of ScientificInstruments, vol. 44 No. 7, Jul. 1970 pp. 1066-1073.

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