Radiant energy – Ionic separation or analysis – Cyclically varying ion selecting field means
Reexamination Certificate
2011-01-04
2011-01-04
Souw, Bernard E (Department: 2881)
Radiant energy
Ionic separation or analysis
Cyclically varying ion selecting field means
C250S281000, C250S282000, C250S290000, C250S294000, C250S295000
Reexamination Certificate
active
07863562
ABSTRACT:
A method for differential mobility separation of ions using digital-drive based high voltage fast switching electronics. The digital waveform delivered to the spectrometer is characterized by at least two substantially rectangular pulses of different amplitude and polarity. The control circuitry allows for waveform frequency, duty cycle and pulse amplitudes to be varied independently. Balanced as well as unbalanced asymmetric waveforms can be designed for optimum differential mobility separation of ions. The digital drive is designed for differential mobility spectrometers including parallel plate and segmented plate multipoles of planar symmetry, as well as multipoles of cylindrical symmetry, which may optionally be arranged in series. The use of the digital drive establishes alternating electric fields during which the displacement as a result of ion oscillation is determined by mobility coefficients.
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Papanastasiou et al. “Differential Mobility Separation of Ions Using a Rectangular Asymmetric Waveform” J. Phys. Chem. A, vol. 112, No. 16, 2008, pp. 3638-3645.
Eiceman Gary
Papanastasiou Dimitrios
Wollnik Hermann
Logie Michael J
Shimadzu Corporation
Souw Bernard E
Sughrue & Mion, PLLC
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