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\documentclass[11pt]{article}

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

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\title{IR - MILLIMETER-WAVE DOUBLE RESONANCE FOR PRECISION MOLECULAR SPECTROSCOPY}

%% Note that \author and \address macros must be paired.
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\author{\underline{\FirstName L. \LastName JUPPET},
  \FirstName O. \LastName PIRALI}
\address{Institut des Sciences Mol\'eculaires d'Orsay, CNRS, Universit\'e Paris Saclay, 91405 Orsay}

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\author{\FirstName J. F. \LastName LAMPIN}
\address{Institut d'Electronique Micro\'electronique et Nanotechnologie, CNRS, Universit\'e de Lille, 59652 Villeneuve d'Ascq cedex}

\author{\FirstName B. \LastName DARQUIE,
  \FirstName M. \LastName MANCEAU, \FirstName Y. \LastName LIU, \FirstName O. \LastName LOPEZ}
\address{Laboratoire de Physique des Lasers, CNRS, Universit\'e Sorbonne Paris Nord, 93430 Villetaneuse}

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\usepackage{fancyhdr}
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\fancyhead[C]{{\footnotesize \textit{HRMS, 28th Colloquium, Dijon, France,
  Aug. 28 - Sept. 1, 2023}}}
\fancyfoot[C]{}
\renewcommand{\headrulewidth}{0.6pt}
\renewcommand{\footrulewidth}{0.6pt}

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\usepackage[colorlinks=true,urlcolor=blue,linkcolor=blue,citecolor=blue]{hyperref}
\voffset -.65 cm

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\category {14,4}
\begin{document}

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

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%% Place the body of your abstract below.
Metrology-grade spectroscopic measurements of molecules are of high importance for numerous applications such as testing fundamental physics\footnote{M. R. Fiecher and al, \textit{The Journal of Physical Chemistry Letters} \textbf{13} 42 (2022)}, molecular physics\footnote{S. P. Belov and al, \textit{The Journal of Chemical Physics} \textbf{145} (2016)}, and astrophysics\footnote{C. Puzzarini and al, \textit{PCCP} \textbf{12} (2020)}. In this context, we tested the well-established double resonance technique\footnote{J. Lemaire, \textit{Th\`ese de l'Universit\'e de Lille} (1974)}$^,$\footnote{T. Shimizu and al, \textit{The Journal of chemical Physics} \textbf{53} (1970)}$^,$\footnote{S. Ghoshal and al, \textit{The Journal of chemical Physics} \textbf{83} (1985)}$^,$\footnote{A. Foltynowicz and al, \textit{PRL} \textbf{126} (2021)} using both infrared and millimeter wave transitions to provide high resolution and frequency metrology dataset. The hyperfine components of rotational transitions involving both the ground and the  $\textit{v}_2=1$ vibrational state of NH$_3$ as well as the $\textit{v}_2=1$ vibrational state of D$_2$O have been investigated trough IR-THz Doppler-free and cross-over-free double resonance spectroscopy. Spectra were obtained using both a free running external cavity quantum cascade laser (QCL installed at SOLEIL synchrotron) as well as a sub-Hz QCL\footnote{R. Santagata and al, \textit{Optica} \textbf{6} (2019)} (installed at LPL Villetaneuse) frequency-stabilised on the REFIMEV signal\footnote{https://www.refimeve.fr}. 
The lasers have been used to optically pump the molecules inducing a velocity class selection. We will present the major interests of this approach for precision spectroscopy and the current limitations we meet. 

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