(19)
(11) EP 1 271 610 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
13.10.2004 Bulletin 2004/42

(43) Date of publication A2:
02.01.2003 Bulletin 2003/01

(21) Application number: 02254394.6

(22) Date of filing: 24.06.2002
(51) International Patent Classification (IPC)7: H01J 49/42
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 25.06.2001 GB 0115429
17.08.2001 GB 0120096
17.08.2001 GB 0120122
15.03.2002 GB 0206164

(71) Applicant: Micromass UK Limited
Manchester M22 5PP (GB)

(72) Inventors:
  • Bateman, Robert Harold
    Knutsford, Cheshire WA16 8NP (GB)
  • Giles, Kevin
    Altrincham, Cheshire WA15 7RR (GB)
  • Pringle, Steve
    Hoddlesden, Darwen BB3 3PS (GB)

(74) Representative: Jeffrey, Philip Michael 
Frank B. Dehn & Co. 179 Queen Victoria Street
London EC4V 4EL
London EC4V 4EL (GB)

   


(54) Mass spectrometer


(57) A mass spectrometer is disclosed comprising a fragmentation cell 1 comprised of a plurality of ring or plate-like electrodes having apertures through which ions are transmitted. An axial DC gradient is preferably maintained along at least a portion of the length of the fragmentation cell 1 in order to improve the transit time of ions through the device.






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