Method and device for the mass-spectrometric examination of fast

Details Method and device for the mass-spectrometric examination of fast Method and device for the mass-spectrometric examination of fast

1993-01-27

1994-12-13

Berman, Jack I.

Radiant energy

Ionic separation or analysis

With sample supply means

250282, H01J 4916, G01N 2762

Patent

active

053731565

ABSTRACT:
Heavy-weight, fast-moving molecular ions are slowed down in a light-weight collision gas to very low velocities and small distributions of velocity before their mass-spectrometric analysis. The velocity reduction of the ions which occurs in the collision gas reduces both ion energy and phase space. In accordance with one embodiment, in order to minimize fragmentation of large molecular ions, an ultrasonic gas jet traveling in the same direction as the ions is used for slowing down the ions. In accordance with another embodiment, the ions are examined in storage mass spectrometers such as ICR spectrometers or ion traps.

REFERENCES:
patent: 4531056 (1985-07-01), Labowsky et al.
patent: 4861988 (1989-08-01), Henion et al.
Quadrupole Storage Mass Spectrometry, J. Wiley & Sons (1989), pp. 331-344.
international Journal Of Mass Spectrometry And Ion Processes, W. H. Guest, (1984) pp. 189-199.

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