Spectroscopy and physics of atoms and molecules
Calculation and analysis of self-broadening coefficients of water vapor lines for the 0.7–14000.0 cm$^{-1}$ spectral range
V. I. Starikov Tomsk State University of Control Systems and Radioelectronics
Abstract:
Within the framework of the semiclassical method, more than 30000 self-broadening coefficients
$\gamma$ of absorption lines of water vapor have been calculated for transitions with rotational quantum numbers
$J\le$ 41,
$K_a\le$ 25 vibrational bands from the spectral range of 0.7–14000.0 cm
$^{-1}$. The calculated and known experimental coefficients
$\gamma$ are analyzed using the analytical model
$\gamma{\operatorname{(sur)}}$ depending on fitted parameters. Parameters of
$\gamma{\operatorname{(sur)}}$ are determined using two procedures. In the first one, parameters of
$\gamma{\operatorname{(sur)}}$ are determined for individual rotational branches with a fixed value of the quantum number
$K_a = 0, \dots,10$. In the second procedure, parameters of
$\gamma{\operatorname{(sur)}}$ are determined from fitting of
$\gamma{\operatorname{(sur)}}$ to 34635 experimental and calculated values
$\gamma{\operatorname{(sur)}}$. The temperature dependence of
$\gamma{\operatorname{(sur)}}$ is also determined. The obtained parameters can be used for the calculation of self-broadening coefficients of absorption lines of arbitrary vibrational bands of Í
$_2$Î with
$J\le$ 41,
$K_a\le$ 13 from the abovementioned range.
Keywords:
water vapor, self-broadening, semiclassical method. Received: 27.10.2020
Revised: 27.10.2020
Accepted: 26.11.2020
DOI:
10.21883/OS.2021.03.50651.267-20
Fulltext:
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