Method and instrument for mass analyzing samples with a quistor

Details Method and instrument for mass analyzing samples with a quistor Method and instrument for mass analyzing samples with a quistor

H - Electricity

01

J

358/9

H01J 49/26 (2006.01) H01J 49/42 (2006.01)

Patent

CA 2010234

A method for the measurement of mass spectra by three dimensional quadrupole fields (QUISTORs) is presented, in which the ions are mass-to-charge selectively ejected by the effect of a natural sum resonance in an inharmonic QUISTOR. In order to enhance scan speed and mass resolution, the ejection of a single kind of ions can be confined to a very small time interval, either by the generation of ions within a small volume outside the field center, or by an excitation of the secular amplitudes by an additional RF voltage across the end electrodes, shortly before the ions encounter the sum resonance condition in the course of the scan. An instrument for this method is described.

L'invention est une méthode de mesure des spectres de masse qui utilise des champs quadripolaires tridimensionnels et dans laquelle les ions sont sélectivement éjectés par une résonance naturelle dans un champ quadripolaire non harmonique. Pour accroître la vitesse de balayage et la résolution en masse, l'éjection d'un seul type d'ions peut être limitée à un intervalle de temps très court immédiatement avant que les ions ne subissent la résonance au cours du balayage, soit en produisant les ions dans un volume restreint ne contenant pas le centre du champ, soit en excitant les amplitudes séculaires par l'application d'une tension RF supplémentaire aux bornes des électrodes terminales. Un appareil utilisant cette méthode est décrit.

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