Radiant energy – Ionic separation or analysis – With sample supply means
Reexamination Certificate
2007-08-14
2007-08-14
Kim, Robert (Department: 2881)
Radiant energy
Ionic separation or analysis
With sample supply means
C250S281000, C250S282000, C250S299000, C250S42300F, C250S424000, C250S425000
Reexamination Certificate
active
11172330
ABSTRACT:
A high sensitivity glow discharge ion source system for analyzing particles includes an aerodynamic lens having a plurality of constrictions for receiving an aerosol including at least one analyte particle in a carrier gas and focusing the analyte particles into a collimated particle beam. A separator separates the carrier gas from the analyte particle beam, wherein the analyte particle beam or vapors derived from the analyte particle beam are selectively transmitted out of from the separator. A glow discharge ionization source includes a discharge chamber having an entrance orifice for receiving the analyte particle beam or analyte vapors, and a target electrode and discharge electrode therein. An electric field applied between the target electrode and discharge electrode generates an analyte ion stream from the analyte vapors, which is directed out of the discharge chamber through an exit orifice, such as to a mass spectrometer. High analyte sensitivity is obtained by pumping the discharge chamber exclusively through the exit orifice and the entrance orifice.
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Scott A. McLuckey, Douglas E. Goeringer, Keiji G. Asano, Gopalakrishnan Vaidyanathan and James L. Stephenson, Jr., High Explosives Vapor Detection by Glow Discharge-Ion Trap, Mass Spectrometry.
M. Rami Alfarra, Thesis—Ch. III—The Aerodyne Aerosol Mass Spectrometer (AMS) , pp. 51-78.
Akerman & Senterfitt
Kim Robert
Nelson Gregory A.
Quinones Eduardo
Souw Bernard
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