Water vapor overtones pressure line broadening and shifting measurements
Istituto di Fisica Atomica e Molecolare del Consiglio
Nazionale delle Ricerche, via del Giardino 7, 56127 Pisa, Italy
Revised: 20 July 1999
Published online: 13 August 2013
By using a spectrometer having as source a commercial etherostructure AlxGaAs diode laser operating in "free-running mode", line shape parameters of some water vapor ro-vibrational overtones at 820-830 nm have been measured at room temperature. These weak absorption lines have been detected by using the wavelength modulation spectroscopy technique with second-harmonic detection. The broadening and shifting coefficients have been obtained by fitting the collected second-harmonic absorption features while varying the pressure of different foreign gases.
PACS: 33.70.Jg – Line and band widths, shapes, and shifts / 33.20.Ea – Infrared spectra / 07.57.Ty – Infrared spectrometers, auxiliary equipment, and techniques
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2000