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Automatic absorption lineshape recording device applied to theJ: 2 → 3 OCS gas transition

Published online by Cambridge University Press:  15 August 1999

D. Breche ,
B. Lamalle ,
F. Truchetet  and
P. Goulet
D. Breche*
Affiliation:
Laboratoire d'Électronique, Informatique et Image (LE2I), Institut Universitaire de Technologie, 12 rue de la Fonderie, 71200 Le Creusot, France
B. Lamalle
Affiliation:
Laboratoire d'Électronique, Informatique et Image (LE2I), Institut Universitaire de Technologie, 12 rue de la Fonderie, 71200 Le Creusot, France
F. Truchetet
Affiliation:
Laboratoire d'Électronique, Informatique et Image (LE2I), Institut Universitaire de Technologie, 12 rue de la Fonderie, 71200 Le Creusot, France
P. Goulet
Affiliation:
Laboratoire d'Électronique, Informatique et Image (LE2I), Institut Universitaire de Technologie, 12 rue de la Fonderie, 71200 Le Creusot, France
*
d.breche@iutlecreusot.u-bourgogne.fr
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Abstract

This paper describes an automatic lineshape recording device applied to the study of the rotational molecular transition J: 2 → 3 of OCS gas at 36.489 GHz. The device includes a microwave oversized cell associated with a DC voltage amplifier and a microcontroller stabilizer. It particularly permits the automatic recording of the lineshape with an accuracy better than 1 kHz for the frequency and 1 mV for the voltage. By fitting with a Lorentz or Voigt profile, we directly determine the evolution of the shape, the center frequency, the broadening parameter and the intensity of the line versus the pressure. At low pressure, the Doppler broadening effect has been measured.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 7 , Issue 2 , August 1999 , pp. 189 - 196
Copyright
© EDP Sciences, 1999

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References

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