Diode laser measurements of H[sub 2]O line intensities and self-broadening coefficients in the 1. 4-[mu]m region

Journal Article · Sat Jan 01 04:00:00 EST 1994 · Journal of Molecular Spectroscopy; (United States)

DOI:https://doi.org/10.1006/jmsp.1994.1004· OSTI ID:5285318

Langlois, S; Birbeck, T P; Hanson, R K ^[1]

---

1. Stanford Univ., CA (United States). Dept. of Mechanical Engineering

Precise knowledge of water vapor radiative properties in the infrared spectrum is needed for many applications. Such applications include atmospheric sounding experiments, radiative sensing of combustion processes, and optical diagnostics for gas-dynamic and aerodynamic studies. Spectrally resolved measurements of pure water vapor absorption spectra have been performed with a tunable diode laser. The laser, a distributed feedback InGaAsP diode, emits in the 1.4-[mu]m region. A total of 12 lines were studied corresponding to rovibrational transitions within the [nu][sub 1] + [nu][sub 3] and 2[nu][sub 1] vibrational bands. A Voigt profile analysis of lineshape is used to infer both intensities and self-collision-broadening coefficients of the water vapor. Good agreements is found between the observed line intensities and those recently measured by Toth. These results are apparently the first published measurements of the broadening coefficient within this spectral range.

• OSTI ID: 5285318
• Journal Information: Journal of Molecular Spectroscopy; (United States), Journal Name: Journal of Molecular Spectroscopy; (United States) Vol. 163:1; ISSN JMOSA3; ISSN 0022-2852
• Country of Publication: United States
• Language: English

Related Subjects

664200* -- Spectra of Atoms & Molecules & their Interactions with Photons-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION SPECTRA
FLUIDS
GASES
INFRARED SPECTRA
LINE BROADENING
LINE WIDTHS
SPECTRA
VAPORS
WATER VAPOR