High-resolution infrared difference frequency laser spectroscopic characterization of methane discharge plasmas

Dionisio Bermejo; P. Cancio; Concepcion Maroto Domingo; Rafael Torres Escribano; Juan Miguel Santos Santos; M. M. Sanz; Isabel Tanarro

doi:10.1117/12.166207

26 January 1994 High-resolution infrared difference frequency laser spectroscopic characterization of methane discharge plasmas

Dionisio Bermejo, P. Cancio, Concepcion Maroto Domingo, Rafael Torres Escribano, Juan Miguel Santos Santos, M. M. Sanz, Isabel Tanarro

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Proceedings Volume 2205, 11th Symposium and School on High-Resolution Molecular Spectroscopy; (1994) https://doi.org/10.1117/12.166207
Event: High Resolution Molecular Spectroscopy: 11th Symposium and School, 1993, Moscow, Russian Federation

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.

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Dionisio Bermejo, P. Cancio, Concepcion Maroto Domingo, Rafael Torres Escribano, Juan Miguel Santos Santos, M. M. Sanz, and Isabel Tanarro "High-resolution infrared difference frequency laser spectroscopic characterization of methane discharge plasmas", Proc. SPIE 2205, 11th Symposium and School on High-Resolution Molecular Spectroscopy, (26 January 1994); https://doi.org/10.1117/12.166207

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KEYWORDS

Laser spectroscopy

Infrared lasers

Infrared spectroscopy

Methane

Spectroscopy

Infrared radiation

Plasmas

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