Radiant energy – Ionic separation or analysis – Cyclically varying ion selecting field means
Reexamination Certificate
2002-12-12
2009-12-22
Berman, Jack I (Department: 2881)
Radiant energy
Ionic separation or analysis
Cyclically varying ion selecting field means
C250S290000, C250S283000, C250S282000, C250S281000
Reexamination Certificate
active
07635841
ABSTRACT:
A method of mass spectrometry is disclosed wherein ions are trapped for a period of time T within an AC or RF ion guide maintained at a pressure P wherein the product P×T is at least 1 mbar-ms. The effect of trapping the ions according to a preferred embodiment is that singly charged ions which may, for example, comprise unwanted background ions are substantially lost from the trap whereas multiply charged analyte ions are maintained within the ion trap and can then be released for subsequent mass analysis.
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Tolmachev, et al.; Radial stratification of ions as a function of mass to charge ratio in collisional cooling radio frequency multipoles used as ion guides or ion traps; Rapid Communications in Mass Spectrometry, pp. 1907-1913 (2000).
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Bateman Robert Harold
Gilbert Anthony James
Hoyes John Brian
Wildgoose Jason Lee
Berman Jack I
Chang Hanway
Micromass UK Limited
Rose Jamie H.
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