Intracavity laser spectroscopy of high-temperature water vapour in the range 9390–9450 cm⁻¹

Measurement of the coefficients of H2O absorption line shifts by intracavity laser spectroscopy

“…This spectrometer was described in detail in [10,11]. The spectrometer is based on a neodymium glass pulsed laser working in a free lasing mode.…”

Absorption spectrum of HDO in the 1.06 μm region at a temperature of 1000 K

“…Preliminary estimates showed that in the 1.06 μm region, there are absorption lines for the following transitions from the vibrational ground state of HDO: 2ν 1 + ν 3 , 4ν 2 + ν 3 , 3ν 1 + ν 2 , 7ν 2 , ν 1 + 2ν 3 , ν 1 + 2ν 2 + ν 3 , ν 1 + 5ν 3 , 2ν 1 + 3ν 2 . In the ≈1 μm region, we have the strongest band 3ν 1 + ν 2 (with center at 9292.999 cm As in [1,2], the spectral lines were identified using a special program based on pattern recognition theory and the spectrum calculated using the "Spectroscopy of Atmospheric Gases" data system developed at the Institute of Atmospheric Optics [9], using a high-precision ab initio calculation for the H 2 O, D 2 O, and HDO molecules [10]. The spectrum was calculated at the temperature 1000 K and for a path length of 10,000 m. vapor recorded at a temperature of 1000 K, 40 lines were assigned to the major isotopic modification H2O, 30 lines were assigned to D 2 O, and 240 lines were assigned to HDO.…”

“…This work continues our series of studies of high-resolution spectra of the water molecule [1,2] and its isotopically substituted modifications in the near IR region, due to transitions to highly excited vibrational-rotational states. The object of investigation was the HDO molecule, whose intracavity absorption spectrum we measured in the range 9387-9450 cm -1 at a temperature of 1000 K.…”

“…To record the shifts of the absorption line centers in the 1.06 μm region, we used an intracavity spectrometer based on a pulsed Nd 3 + laser, operating in the free lasing mode; the spectrometer was described in [2]. The spectrum was recorded using a DFS-8 diffraction spectrometer (focal length 2650 mm) with an optical scanner based on a CCD linear array.…”

Spectrum of hot water in the 4750-13 000 cm−1wavenumber range (0.769-2.1 μm)

“…There are a few diode laser measurements of heated water vapour (300–1000 K) near 1.4 μm (Liu et al 2007), hotter laser measurements (1500–1800 K) near 9400 Å (Cattaneo, Laurila & Hernberg 2004) and an intracavity Nd‐glass laser experiment near 9400 cm −1 . The intracavity experiment used both a heated cell filled with water vapour at up to 1000 K and a plasma torch to reach 2200 K, but covered only the 9390–9450 cm −1 region (Petrova et al 2006).…”