Radiant energy – Ionic separation or analysis
Reexamination Certificate
2005-03-29
2005-03-29
Lee, John R. (Department: 2881)
Radiant energy
Ionic separation or analysis
C250S292000, C250S287000, C250S288000
Reexamination Certificate
active
06872938
ABSTRACT:
A mass spectrometer10comprises an ion source12which generates nebulized ions which enter an ion cooler20via an ion source block16.Ions within a window of m/z of interest are extracted via a quadrupole mass filter24and passed to a linear trap30.Ions are trapped in a potential well in the linear trap30and are bunched at the bottom of the potential well adjacent an exit segment50.Ions are gated out of the linear trap30into an electrostatic ion trap130and are detected by a secondary electron multiplier10.By bunching the ions in the linear trap30prior to ejection, and by focussing the ions in time of flight (TOF) upon the entrance of the electrostatic trap130,the ions arrive at the electrostatic trap130as a convolution of short, energetic packets of similar m/z. Such packets are particularly suited to an electrostatic trap because the FWHM of each packet's TOF distribution is less than the period of oscillation of those ions in the electrostatic trap.
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Hardman Mark E.
Makarov Alexander
Schwartz Jae C.
Senko Michael W.
Hashmi Zia R.
Haynes and Boone LLP
Lee John R.
Thermo Finnigan LLC
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