Diode laser spectroscopy of ammonia at 760 nm

Year: 2009

Authors: Lucchesini A., Gozzini S.

Autors Affiliation: Istituto per i Processi Chimico-Fisici (IPCF) – CNR

Abstract: A tunable diode laser spectrometer has been employed to examine the unknown overtone absorption lines of NH(3) around 13, 100 cm(-1) (760 nm). The spectrometer sources are commercially available heterostructure AlGaAs tunable diode lasers operating in the \”free-running\” mode. The detection of the lines has been possible by the use of the wavelength modulation spectroscopy and the second harmonic detection technique. A special algorithm has been used in order to fit the highly modulated absorption lines. The weakest observed resonances have absorption cross sections on the order of similar or equal to 1 X 10(-25) cm(2)/molecule or similar or equal to 0.3 km(-1)/amagat. For some of the more intense lines self-, air-, N(2)-. He- and H(2)-broadening coefficients have been obtained at room temperature and also some shifting coefficients have been measured. (c) 2009 Elsevier B.V. All rights reserved.

Journal/Review: OPTICS COMMUNICATIONS

Volume: 282 (17)      Pages from: 3493  to: 3498

KeyWords: Molecular spectroscopy; Ammonia; Line broadening and shift; Overtone bands; Tunable diode laser
DOI: 10.1016/j.optcom.2009.05.049

Citations: 6
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