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Title: Use of nonlocal helium microplasma for gas impurities detection by the collisional electron spectroscopy method

The collisional electron spectroscopy (CES) method, which lays the ground for a new field for analytical detection of gas impurities at high pressures, has been verified. The CES method enables the identification of gas impurities in the collisional mode of electron movement, where the advantages of nonlocal formation of the electron energy distribution function (EEDF) are fulfilled. Important features of dc negative glow microplasma and probe method for plasma diagnostics are applied. A new microplasma gas analyzer design is proposed. Admixtures of 0.2% Ar, 0.6% Kr, 0.1% N{sub 2}, and 0.05% CO{sub 2} are used as examples of atomic and molecular impurities to prove the possibility for detecting and identifying their presence in high pressure He plasma (50–250 Torr). The identification of the particles under analysis is made from the measurements of the high energy part of the EEDF, where maxima appear, resulting from the characteristic electrons released in Penning reactions of He metastable atoms with impurity particles. Considerable progress in the development of a novel miniature gas analyzer for chemical sensing in gas phase environments has been made.
Authors:
 [1] ; ;  [2]
  1. St. Petersburg State University, 7-9 Universitetskaya nab., 199034 St. Petersburg (Russian Federation)
  2. Institute of Solid State Physics, Bulgarian Academy of Sciences, 72 Tzarigradsko Chaussee blvd., 1784 Sofia (Bulgaria)
Publication Date:
OSTI Identifier:
22486482
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 22; Journal Issue: 10; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ARGON; ATOMS; CARBON DIOXIDE; DETECTION; DISTRIBUTION FUNCTIONS; ELECTRON COLLISIONS; ELECTRON SPECTROSCOPY; ENERGY SPECTRA; HELIUM; NITROGEN; PLASMA DIAGNOSTICS; PLASMA IMPURITIES; PRESSURE RANGE MEGA PA 10-100