Leonid N. Sinitsa

Rotation-vibration spectra of deuterated water vapor in the 9160–9390-cm−1 region☆

Abstract The absorption spectrum of mixtures of H 2 O, HDO and D 2 O has been recorded in the region 9161.5 to 9392.5 cm −1 with an absorption sensitivity of 10 −7 cm −1 and a line-center determination accuracy of 0.08 cm −1 . An attempt to identify the absorption bands of the spectrum obtained experimentally was undertaken. The justification for attributing the observed lines to the HDO bands (3 ν 1 + ν 2 ), ( ν 1 + 2 ν 2 + ν 3 ) and D 2 O bands ( ν 2 + 3 ν 3 ), ( ν 1 + ν 2 + 2 ν 3 ) is given. In this study the bands centers have been found and the molecular rotational and centrifugal constants have been determined as well.

The vibration-rotation HDO absorption spectrum between 8558 and 8774 cm−1

Abstract The absorption spectrum of HDO has been recorded in the region 8558–8774 cm −1 using a high-sensitivity intracavity F 2 − :LiF center laser spectrometer. The absorption sensitivity is 10 −7 cm −1 and the line-center determination accuracy is about 4 × 10 −2 cm −1 . The spectrum was interpreted and the absorption lines were attributed to the ν 2 + 2 ν 3 band of HDO. Energy levels up to J = 12 and rotational and centrifugal parameters of the vibrational (012) state were obtained.

Water vapor line strengths in the 1-μm region

Abstract The line strenghts of H 2 O bands ν 1 + ν 2 + ν 3 and ν 2 + 2 ν 3 have been measured using a high-resolution Nd-glass single-mode laser spectrophotometer. The parameters of 33 lines were found by fitting a Voigt contour to experimental line profile. The vibration-rotation interaction affecting the line strength was taken into account by using the F factor in the three-parametric form, and its constants for ν 1 + ν 2 + ν 3 and ν 2 + 2 ν 3 bands were found. There is a good agreement between line intensities calculated using these constants and the experimental values.

High-resolution Q-branches spectrum of C2H2 at 9366 and 9407 cm−1

The acetylene absorption spectrum in the Nd-laser range 9240–9520 cm−1 has been recorded earlier (1), using a highly sensitive intracavity laser spectrometer. Two weak absorption perpendicular bands 2100011 ← 0000000 (ν0 = 9366.6 cm−1) and 1200°31 ← 0000°0° (ν0 = 9407.7 cm−1) were studied and spectroscopic constants were obtained. However, the structure of the Q branches of these bands with J < 7 was unresolved because the resolution of the spectrometer was not very high.