Diode laser spectroscopy of ammonia and ethylene overtones

Year: 2004

Authors: Lucchesini A., Gozzini S.

Autors Affiliation: IPCF-CNR Pisa, Area Ric, Via G Moruzzi 1, I-56124 Pisa, Italy.

Abstract: Some overtone absorption lines of ammonia and ethylene have been examined by using a tunable diode laser (TDL) spectrometer in the region around 12,650 and 11,800 cm(-1), respectively. The spectrometer sources are commercially available double heterostructure InGaAlAs and AlGaAs TDLs operating in the \”free-running\” mode. The high resolving power (similar to10(7)) of the spectrometer permitted the detection and the study of the line positions of such molecules with a precision better than 0.01 cm(-1). In order to maximize the signal to noise ratio and to extract the necessary informations either on the line width and on the line position for the detected molecular resonances, the wavelength modulation spectroscopy (WMS) along with the second harmonic detection techniques have been applied. For this purpose, the fitting procedure took into account the instrumental effects and the amplitude modulation (AM) always associated with the frequency modulation (FM) of these type of sources. This technique permitted also the measurement of the collisional-broadening and -shifting coefficients by different buffer gases at room temperature. (C) 2004 Elsevier B.V. All rights reserved.


Volume: 60 (14)      Pages from: 3381  to: 3386

KeyWords: spettroscopia molecolare; diodi laser; overtone; monitoraggio ambientale; etilene
DOI: 10.1016/j.saa.2003.11.039

Citations: 4
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