skip to main content

Title: Measurements of the number density of water molecules in plasma by using a combined spectral−probe method

A novel method for measuring the number density of water molecules in low-temperature plasma is developed. The absolute intensities of rotational lines of the (0,0) band of the OH(A{sup 2}Σ–X{sup 2}Π) transition are used. Lines with sufficiently large rotational quantum numbers referring to the so-called “hot” group of molecules produced by electron-impact dissociative excitation of water molecules are chosen for measurements. The excitation rate of a process with a known cross section is determined by measuring the parameters of plasma electrons by means of the probe method. The measured number densities of molecules are compared with those in the initial plasma-forming mixture. The time evolution of the particle densities in plasma is investigated. The problems of the sensitivity and applicability of the absolute spectral method are considered.
Authors:
;  [1] ;  [2] ;  [3]
  1. Russian Academy of Sciences, Lebedev Physical Institute (Russian Federation)
  2. Tsentr Information Consulting Company (Russian Federation)
  3. ITER Organization (France)
Publication Date:
OSTI Identifier:
22472113
Resource Type:
Journal Article
Resource Relation:
Journal Name: Plasma Physics Reports; Journal Volume: 41; Journal Issue: 9; Other Information: Copyright (c) 2015 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; COMPARATIVE EVALUATIONS; CROSS SECTIONS; ELECTRON-MOLECULE COLLISIONS; ELECTRONS; EXCITATION; MIXTURES; MOLECULES; PLASMA; PROBES; QUANTUM NUMBERS; SENSITIVITY; WATER