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\documentclass[11pt]{article}

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

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\title{CONSTRUCTION AND PRELIMINARY RESULTS OF A KU-BAND CHIRPED-PULSE MICROWAVE FOURIER TRANSFORM SPECTROMETER}

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\author{\underline{\FirstName S. \LastName COLLIGNON}} 
\address{Institute of Condensed Matter and Nanosciences, Universit\'{e} catholique de Louvain, Louvain-la-Neuve, B-1348, Belgium}

\author{\FirstName B.~M. \LastName HAYS}
\address{Universit\'{e} de Lille, CNRS, UMR8523---PhLAM---Physique des Lasers Atomes et Mol\'{e}cules, F-59000 Lille, France}

% \author{\FirstName D. \LastName LEDERER} 
% \address{Institute of Information and Communication Technologies, Electronics and Applied Mathematics, Universit\'{e} Catholique de Louvain, Louvain-la-Neuve, B-1348, Belgium}

\author{\FirstName D. \LastName LEDERER} 
\address{Institute of Information and Communication Technologies, Electronics and Applied Mathematics, Universit\'{e} catholique de Louvain, Louvain-la-Neuve, B-1348, Belgium}

\author{\FirstName M. \LastName DAMAN, \FirstName C. \LastName LAUZIN} 
\address{Institute of Condensed Matter and Nanosciences, Universit\'{e} catholique de Louvain, Louvain-la-Neuve, B-1348, Belgium} 

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\fancyhead[C]{{\footnotesize \textit{HRMS, 28th Colloquium, Dijon, France,
  Aug. 28 - Sept. 1, 2023}}}
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\category {4}
\begin{document}

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

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\index{Rotational}
\index{Microwave}
\index{FID}

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The chirped-pulse Fourier transform microwave (CP-FTMW) spectroscopy technique is an efficient tool for the rapid measurement of broadband rotational spectra~\footnote{
    \href{https://doi.org/10.1063/1.2919120}{doi:10.1063/1.2919120}, G. G. Brown et al., \textit{Rev. Sci. Instrum.}, \textbf{79}, 053103 (2008).}. Fast, state-of-the-art arbitrary waveform generators (AWG) and oscilloscopes are usually required for CP-FTMW spectrometers to induce and detect the free induction decay (FID) in a gas of molecules.

    Alternatively, the CP-FTMW spectrometer currently developed at UCLouvain makes use of a 2.5 GSa/s direct digital synthesizer in place of an AWG, following the work of Ref.~\footnote{
    \href{https://doi.org/10.1063/1.4818137}{doi:10.1063/1.4818137}, I. A. Finneran et al., \textit{Rev. Sci. Instrum.}, \textbf{84}, 083104 (2013).}. It also leverages heterodyne detection to allow the acquisition of the FIDs with a 1 GSa/s oscilloscope. A quadrature demodulation technique is implemented to discriminate between the lower and upper sidebands of the probed frequency range~\footnote{\href{https://doi.org/10.1039/C1CP22197C}{doi:10.1039/C1CP22197C}, J.-U. Grabow et al., \textit{Phys. Chem. Chem. Phys.}, \textbf{13}, 21063-21069 (2011).}. A computer program was developed to automate the scan of the Ku-band (12$-$18 GHz) and remove the spurious content from the spectra.
    
    Methanol spectra have been measured in the Ku-band  to assess the performances of the spectrometer. The methanol sample was first studied at room temperature in a waveguide cell. The 12$-$18 GHz frequency range was covered by concatenation of multiple 500 MHz sub-spectra, all acquired and averaged 10$^5$ times in $\sim$ 13 minutes. In this configuration, the acquisition rate, precision and sensitivity of the instrument were evaluated. Based on Ref.~\footnote{\href{https://doi.org/10.1016/j.jqsrt.2020.107001}{doi:10.1016/j.jqsrt.2020.107001}, B. M. Hays et al., \textit{J. Quant. Spectrosc. Radiat. Transf.}, \textbf{250}, 107001 (2020).}, we fitted the FID in the time domain and extracted the resonant frequency and the $T_2$ coherence time. First measurements performed in a supersonic expansion will also be presented.


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