Radiant energy – Ionic separation or analysis – Ion beam pulsing means with detector synchronizing means
Reexamination Certificate
2007-04-03
2007-04-03
Wells, Nikita (Department: 2881)
Radiant energy
Ionic separation or analysis
Ion beam pulsing means with detector synchronizing means
C250S282000, C250S285000, C250S288000
Reexamination Certificate
active
10964791
ABSTRACT:
A mass spectrometer is disclosed comprising an ion source4, a field free or drift region5and an ion mirror7comprising a reflectron. Metastable parent ions which spontaneously fragment by Post Source Decay whilst passing through the field free or drift region5are arranged to enter the ion mirror7and be reflected by the reflectron towards an ion detector8when the reflectron is maintained at a certain voltage. The process is then repeated with the reflectron being maintained at a slightly lower voltage. Two related sets of time of flight or mass spectral data are obtained for the two different voltage settings of the reflectron. From the two data sets the different times of flight for the same species of fragment ion can be determined. The mass to charge ratio of the parent ion which fragmented to produce the particular species of fragment ion can then be determined from the times of flight of the fragment ions.
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Bateman Robert Harold
Brown Jeffery Mark
Kenny Daniel James
Janick Anthony J.
Micromass UK Limited
Rose Jamie H.
Smith II Johnnie L
Wells Nikita
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