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Proceedings Paper

High-resolution infrared difference frequency laser spectroscopic characterization of methane discharge plasmas
Author(s): Dionisio Bermejo; P. Cancio; Concepcion Maroto Domingo; Rafael Torres Escribano; Juan Miguel Santos Santos; M. M. Sanz; Isabel Tanarro
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Paper Abstract

Using an original double modulation set-up of an IR difference frequency laser spectrometer and a hollow cathode discharge cell with methane, in addition to a double phase sensitive detection method, it has been possible to distinguish between (nu) 3 band spectral lines of the CH3 radical and the much stronger lines belonging to the C-H stretching bands of the precursor and other stable species (C2H4, C2H6) that appear in the discharge. The method has proved to be very sensitive to detect population variations versus temperature of very weak transitions from highly excited levels of CH4 and other stable species. The temperature characterization of several neutral species involved in the hollow cathode discharge has been tested and remarkably low temperatures have been obtained.

Paper Details

Date Published: 26 January 1994
PDF: 5 pages
Proc. SPIE 2205, 11th Symposium and School on High-Resolution Molecular Spectroscopy, (26 January 1994); doi: 10.1117/12.166207
Show Author Affiliations
Dionisio Bermejo, Instituto de la Estructura de la Materia (Spain)
P. Cancio, Instituto de la Estructura de la Materia (Spain)
Concepcion Maroto Domingo, Instituto de la Estructura de la Materia (Spain)
Rafael Torres Escribano, Instituto de la Estructura de la Materia (Spain)
Juan Miguel Santos Santos, Instituto de la Estructura de la Materia (Spain)
M. M. Sanz, Instituto de la Estructura de la Materia (Spain)
Isabel Tanarro, Instituto de la Estructura de la Materia (Spain)


Published in SPIE Proceedings Vol. 2205:
11th Symposium and School on High-Resolution Molecular Spectroscopy
Alexander I. Nadezhdinskii; Yu V. Ponomarev; Leonid N. Sinitsa, Editor(s)

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