Line Position And Line Intensity Analyses Of H218o Up To The First Triad And J=20a

Coudert, L. H.

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https://hdl.handle.net/2142/116968 Copy

Description

Title

Line Position And Line Intensity Analyses Of H218o Up To The First Triad And J=20a

Author(s)

Coudert, L. H.

Contributor(s)

• Campargue, Alain
• Mikhailenko, Semen
• Mellau, Georg Ch.

Issue Date

2022-06-22

Keyword(s)

Large amplitude motions, internal rotation

Abstract

We present a line position analysis of a large body of data pertaining to H$_2^{18}$O and involving all 5 vibrational states up to the First Triad, namely, the lowest lying states (000), (010), (020), (100), and (001).\footnotetext[1]{Financial support from the French Programme National de Physique et Chimie du Milieu Interstellaire is acknowledged} The data set contains infrared lines retrieved in this work, from FTS and from high-temperature emission spectra, and already published high-resolution measurements including microwave and THz transitions, and kHz accuracy transitions.$^b$\footnotetext[2]{Kyr\"o, {\em J.\ Mol.\ Spec.}~{\bf 88} (1981) 167; Matsushima {\em et al.,} {\em J.\ Mol.\ Spec.}~{\bf 193} (1999) 217; and Diouf {\em et al.,} {\em J.\ Phys.\ Chem.\ Ref.\ Data}~{\bf 50} (2021) 023106} The analysis, carried out with the Bending-Rotation fitting Hamiltonian,$^c$\footnotetext[3]{Coudert and Ch\'elin, {\em J.\ Mol.\ Spec.}~{\bf 326} (2015) 130} allows us to reproduce more than 11700 data with a unitless standard deviation of 1.6 up to $J=20$ and $K_a=16$. The highly accurate THz transitions$^b$ are reproduced with an RMS of 0.2~MHz and the kHz accuracy transitions$^b$ with an RMS better than 0.3~MHz. A line intensity analysis of absorption transitions involving the same vibrational states will also be presented. FIR line intensities measured in this work using FTS were fitted in addition to previously measured line intensities. 3890 line intensities are accounted for with a unitless standard deviation of 1.4. The absorption line list calculated using these results will be compared to that recently obtained from theoretical calculations.$^d$\footnotetext[4]{Conway {\em et al.,} {\em J.\ Quant.\ Spec.\ Rad.\ Trans.}~{\bf 241} (2020) 106711} With the present set of spectroscopic parameters, discrepancies up to 0.09~cm$^{-1}$ are noted for the line positions.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Handle URL

https://hdl.handle.net/2142/116968&&

DOI

https://doi.org/10.15278/isms.2022.WF09

Copyright and License Information

Copyright 2022 held by the authors

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