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%% Sample TeX file for the HRMS Dijon 2023 abstracts
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\documentclass[11pt]{article}

\usepackage{hrms}  %% Page settings, style ... for the HRMS abstract book.

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\title{H$_2$O-HF DIMER ROTATIONAL SPECTRA: NEW MEASURMENTS AND RE-ANALYSIS}

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\author{\FirstName G.~Yu. \LastName GOLUBIATNIKOV,
  \FirstName N.~F. \LastName ZOBOV,
  \FirstName R.~I \LastName OVSYANNIKOV,
  \FirstName M.~Yu \LastName TRETYAKOV}
\address{Institute of Applied Physics, Russian Academy of Sciences, 
   46 Ulyanov Street, Nizhny Novgorod, 603950, Russia}

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\author{\underline{\FirstName O.~L. \LastName POLYANSKY},
  \FirstName J. \LastName TENNYSON}
\address{Department of Physics and Astronomy, University College London,
    Gower Street, London WC1E 6BT, United Kingdom}

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\usepackage{fancyhdr}
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\fancyhead[C]{{\footnotesize \textit{HRMS, 28th Colloquium, Dijon, France,
  Aug. 28 - Sept. 1, 2023}}}
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\usepackage[colorlinks=true,urlcolor=blue,linkcolor=blue,citecolor=blue]{hyperref}
\voffset -.65 cm

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\category {4,11}
\begin{document}

\maketitle  %% This will also build the list of author(s) and addresse(s).

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New measurements of the H$_2$O-HF dimer absorption spectrum are performed using
a warm (240 - 260 K) equilibrium gas mixture with two complementary
spectrometers: a video spectrometer and spectrometer with radio-acoustic
detection. We demonstrate that measurements in the millimeter-
and submillimeter-wave region allows the rotational spectra of the dimer
in its ground vibrational state and in multiple thermally-populated
intermolecular vibrational states to be observed. Positions of over hundred
H$_2$O-HF lines in the 158--345 GHz range are refined (their uncertainty is
reduced from previous measurments \footnote{\href{
http://dx.doi.org/10.1016/j.jms.2006.11.008}
{doi:10.1016/j.jms.2006.11.008}, S.P. Belov, V.M. Demkin, N.F. Zobov,
E.N. Karyakin, A.F. Krupnov, I.N. Kozin, O.L. Polyansky and M.Yu. Tretyakov,
Microwave study of the submillimeter spectrum of the H$_2$O-HF dimer,
J. Mol. Spectrosc. 241, 124-135 (2007).}
by about order of magnitude) and several tens of lines  are newly
measured. These data are re-fitted together with previous measurements giving
a refined set of constants of effective Hamiltonian which characterizes
the dimer intermolecular dynamics. We demonstrate that the new data allow
to improve significantly (from 100 to about 10~kHz) the accuracy of rotational
constants corresponding to separate series of lines with fixed $K_a$. Such
series-by-series analysis of the spectrum is proposed as a method for
identification of lines belonging to thermally populated exited vibrational
states of the dimer on the basis of future \ai~calculations.
Studies of H$_2$O-HF are important because the system is similar, but easier
to study than the important and more complicated water dimer. In particular,
unlike the water dimer, H$_2$O-HF  high resolution spectra can be observed
and accurately measured at relatively high temperatures.

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