TAILIEUCHUNG - Tunable diode laser spectroscopy and line parameters of water vapor in the near infrared

In this study, we present the technique of tunable diode laser spectroscopy and the spectroscopic parameters of 13 lines of H2O in the 11980 -12260 cm−1 spectral region. Spectra were recorded at room temperature for a wide range of pressures (2 - 15 Torr for pure H2O and 50 - 760 Torr for H2O in air). | JOURNAL OF SCIENCE OF HNUE Mathematical and Physical Sci. 2014 Vol. 59 No. 7 pp. 157-164 This paper is available online at http TUNABLE DIODE LASER SPECTROSCOPY AND LINE PARAMETERS OF WATER VAPOR IN THE NEAR-INFRARED Ngo Ngoc Hoa and Nguyen Manh Nghia Faculty of Physics Hanoi National University of Education Abstract. In this study we present the technique of tunable diode laser spectroscopy and the spectroscopic parameters of 13 lines of H2 O in the 11980 -12260 cm 1 spectral region. Spectra were recorded at room temperature for a wide range of pressures 2 - 15 Torr for pure H2 O and 50 - 760 Torr for H2 O in air . Line parameters were adjusted from experiments using the least square method Fortran and three line-shape models the Voigt profile VP the hard collision Rautian profile RP and the speed dependent Voigt profile SDVP . A comparison between our results with the HITRAN database 2012 shows good agreement. Keywords Water vapor line-shape tunable diode laser spectroscopy. 1. Introduction Water vapor is a key molecule in the Earth s atmosphere its distribution the object of several remote sensing experiments. The latter provide recordings of atmospheric absorption spectra whose inversion yields the atmospheric humidity vertical profile. For such applications precise knowledge of the spectroscopic parameters of the H2 O lines is needed. In this work line parameters position integrated intensity and broadening coefficient are deduced from laboratory spectra assuming a specific line-shape. For this the Voigt profile 1 is used in most of the available studies. Within this model two collisional parameters are used . the Lorentz broadening and shifting coefficients the Doppler width being fixed to its theoretical value. As is well known 2-4 the Voigt model can lead to discrepancies with measured spectra since it does not take into account two velocity effects a collision-induced velocity changes leading to the so-called Dicke narrowing and b the

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