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Title: Atmospheric sampling glow discharge ionization source

Abstract

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.

Inventors:
 [1];  [1]
  1. (Oak Ridge, TN)
Issue Date:
Research Org.:
LOCKHEED MARTIN ENRGY SYST INC
OSTI Identifier:
867047
Patent Number(s):
4849628
Assignee:
Martin Marietta Energy Systems, Inc. (Oak Ridge, TN) ORNL
DOE Contract Number:  
AC05-84OR21400
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
atmospheric; 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; /250/

Citation Formats

McLuckey, Scott A., and Glish, Gary L. Atmospheric sampling glow discharge ionization source. United States: N. p., 1989. Web.
McLuckey, Scott A., & Glish, Gary L. Atmospheric sampling glow discharge ionization source. United States.
McLuckey, Scott A., and Glish, Gary L. Sun . "Atmospheric sampling glow discharge ionization source". United States. https://www.osti.gov/servlets/purl/867047.
@article{osti_867047,
title = {Atmospheric sampling glow discharge ionization source},
author = {McLuckey, Scott A. and Glish, Gary L.},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1989},
month = {1}
}

Patent:

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