Mass spectrometer with multiple capacitively coupled mass...

H - Electricity – 01 – J

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

Patent

CA 2313841

A mass spectroscopy apparatus having two quadrupole mass analyzer stages is disclosed. Both stages are configured to transmit ions of the same mass to charge ratio and they are operated in series to provide a tandem mass analyzer having greater resolution than either stage has separately. The poles of the two quadrupoles are positioned axially and close together to minimize ion loss between the two stages. The RF component of the potential across the two stages are kept in phase such that some poles of the first stage are always 180° out of phase with some poles of the other stage. Capacitors are provided to couple the out of phase poles of the two stages to one another, thereby compensating for a stray capacitance which arises between the in phase poles of the two stages.

Un appareil de spectroscopie de masse ayant deux étapes d'analyseur de masse quadripolaire est divulgué. Les deux étapes sont configurées pour transmettre les ions d'un même rapport de masse sur charge et ils sont exploités en série pour fournir un analyseur de masse en tandem ayant une plus grande résolution que chaque étape séparément. Les pôles des deux quadripôles sont positionnés axialement et à proximité l'un de l'autre pour minimiser la perte d'ions entre les deux étapes. La composante RF du potentiel à travers les deux étapes est maintenue en phases de sorte que certains pôles de la première étape sont toujours 180O hors phase avec certains pôles de l'autre étape. Des condensateurs sont fournis pour accoupler les pôles hors phase des deux étapes l'un à l'autre, compensant ainsi pour une capacité parasite qui se pose entre les pôles de phase des deux étapes.

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