(19)
(11) EP 1 306 881 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
10.11.2004 Bulletin 2004/46

(43) Date of publication A2:
02.05.2003 Bulletin 2003/18

(21) Application number: 02257332.3

(22) Date of filing: 22.10.2002
(51) International Patent Classification (IPC)7: H01J 49/40
(84) Designated Contracting States:
AT BE BG CH CY CZ DE DK EE ES FI FR GB GR IE IT LI LU MC NL PT SE SK TR
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 22.10.2001 GB 0125241
19.11.2001 GB 0127662
17.09.2002 GB 0221502

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

(72) Inventors:
  • Bateman, Robert Harold
    Knutsford, Cheshire, WA16 8NP (US)
  • Green, Martin
    Bowden, Altrincham, Cheshire, WA14 3EE (US)

(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 wherein the pusher electrode 4 of a Time of Flight mass analyser is operated in conjunction with an ion gate 2 to ensure that low mass background or matrix ions are not injected into the drift region 5 of the mass analyser.






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