Atmospheric sampling glow discharge ionization source
- Oak Ridge, TN
An atmospheric sampling glow discharge ionization source that can be used in combination with an analytical instrument which operates at high vacuum, such as a mass spectrometer. The atmospheric sampling glow discharge ionization source comprises a chamber with at least one pair of electrodes disposed therein, an inlet for a gaseous sample to be analyzed and an outlet communicating with an analyzer which operates at subatmospheric pressure. The ionization chamber is maintained at a pressure below atmospheric pressure, and a voltage difference is applied across the electrodes to induce a glow discharge between the electrodes, so that molecules passing through the inlet are ionized by the glow discharge and directed into the analyzer. The ionization source accepts the sample under atmospheric pressure conditions and processes it directly into the high vacuum instrument, bridging the pressure gap and drawing off unwanted atmospheric gases. The invention also includes a method for analyzing a gaseous sample using the glow discharge ionization source described above.
- Research Organization:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- DOE Contract Number:
- AC05-84OR21400
- Assignee:
- Martin Marietta Energy Systems, Inc. (Oak Ridge, TN)
- Patent Number(s):
- US 4849628
- OSTI ID:
- 867047
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
sampling
glow
discharge
ionization
source
combination
analytical
instrument
operates
vacuum
mass
spectrometer
comprises
chamber
pair
electrodes
disposed
therein
inlet
gaseous
sample
analyzed
outlet
communicating
analyzer
subatmospheric
pressure
maintained
below
voltage
difference
applied
induce
molecules
passing
ionized
directed
accepts
conditions
processes
directly
bridging
gap
drawing
unwanted
gases
method
analyzing
described
atmospheric gases
pressure conditions
mass spectrometer
glow discharge
atmospheric pressure
disposed therein
ionization chamber
subatmospheric pressure
ionization source
source comprises
sampling glow
voltage difference
atmospheric sampling
analytical instrument
gaseous sample
electrodes disposed
discharge ionization
pressure below
atmospheric gas
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