Diode laser measurements of the first overtone HF lineshape broadened by Ar, Xe, Kr and N-2

作者：Ivanov S V^*; Semenov V M; Nabiev S S; Ponurovskii Y

来源：Applied Physics B: Lasers and Optics , 2014, 117(1): 423-435.

DOI：10.1007/s00340-014-5851-9

A high-resolution spectroscopy study of the HF first overtone vibrational-rotational 0-2 R(0) line profile was carried out in Ar, Xe, Kr and N-2 gas mixtures using near-IR tunable diode laser. The HF 0-2 R(0) analytical line is known as the most appropriate for laser detection of HF molecules in the atmosphere. Highly accurate collisional broadening, shift and "narrowing" coefficients were determined from the direct spectroscopic fit employing traditional Voigt, Rautian and Galatry symmetric profiles and using an asymmetric speed-dependent Voigt profile. These data make the information of modern spectroscopic databases, e.g., HITRAN2012, much more exact. A noticeable line shape asymmetry was investigated in detail. In this paper, the validity of the use of model profiles in spectroscopic fitting is severely discussed. For the first time, we draw attention to the need for physically realistic line shape models to avoid systematic errors in retrieved gas concentrations. We stress that in the case of HF, all considered model profiles serve only as ad hoc models; they may conceal the true physics of spectral line formation.

• 出版日期2014-10