Eur. Phys. J. AP
Volume 7, Number 2, August 1999
|Page(s)||189 - 196|
|Published online||15 August 1999|
Automatic absorption lineshape recording device applied to the J: 2 → 3 OCS gas transition
Laboratoire d'Électronique, Informatique et Image (LE2I), Institut Universitaire de
Technologie, 12 rue de la Fonderie, 71200 Le Creusot, France
Corresponding author: firstname.lastname@example.org
Revised: 25 May 1999
Accepted: 25 May 1999
Published online: 15 August 1999
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.
PACS: 39.30.+w – Spectroscopic techniques / 32.70.Jz – Line shapes, widths, and shifts / 33.20.Sn – Rotational analysis
© EDP Sciences, 1999
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