Method for increased resolution in tandem mass spectrometry

H - Electricity – 01 – J

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H01J 49/26 (2006.01) H01J 49/32 (2006.01) H01J 49/42 (2006.01)

Patent

CA 2090217

A method is provided of increasing the resolution in a tandem mass spectrometer having a first quadrupole Q1 to select a parent ion, a second quadrupole Q2 which contains a target gas and forms a collision cell, and a third or analyzing quadrupole Q3 which generates a mass spectrum from daughter ions from Q2. In the method, the target thickness of the target gas in Q2 is held at least at 1.32 x 10 15 cm-2, preferably at least 3.30 x 10 15 cm-2, and the DC offset voltage between Q2 and Q3 is kept low or zero. This greatly improves the resolution available in Q3. Q3 is therefore operated with at least unit resolution, and in some cases with resolution of 1/2 or 1/3 amu, making it possible to resolve isotopes of singly, doubly or triply charged daughter ions.

L'invention est une méthode servant à accroître la résolution d'un spectromètre de masse tandem portant un premier quadripôle Q1 servant à sélectionner un ion parent, un second quadripôle Q2 contenant un gaz cible et formant une cellule de collision, et un troisième quadripôle Q3 servant de quadripôle d'analyse qui produit le spectre de masse des ions de filiation contenus dans Q2. Dans cette méthode, l'épaisseur du gaz cible dans Q2 est maintenue à 1,32 x 1015 cm-2 au moins et à 3,30 x 1015 cm-2 au moins dans la concrétisation privilégiée de l'invention, et la tension de décalage continue entre Q2 et Q3 est maintenue faible ou nulle. Ceci améliore considérablement la résolution de Q3. Ce quadripôle par conséquent utilisé avec une résolution d'au moins une unité de masse atomique et, dans certains cas, avec une résolution de 1/2 ou 1/3 d'unité de masse atomique, de sorte qu'il y est possible de distinguer les isotopes d'ions de filiation à une, deux ou trois charges.

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