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\title{DOUBLE RESONANCE EXCITATION OF OVERTONES AND COMBINATION BANDS IN JET-COOLED N$_2$O}

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\author{\underline{\FirstName J. \LastName BOSMANN,}
	\underline{\FirstName F. \LastName PETERS},
	\underline{\FirstName K. \LastName VAVRA},
	\underline{\FirstName G.~W. \LastName FUCHS},
	\underline{\FirstName T.~F. \LastName GIESEN}}\address{Laborastrophysik, Universit{\"a}t Kassel, Heinrich-Plett-Stra{\ss}e 40, 34132 Kassel, Germany}

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\fancyhead[C]{{\footnotesize \textit{HRMS, 28th Colloquium, Dijon, France,
  Aug. 28 - Sept. 1, 2023}}}
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\category {3,4}
\begin{document}

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%Propylene oxide (PO) is a prime candidate for three-wave mixing (3WM) techniques. Prequesite to such experiments is the precise knowledge of the spectrum in the desired frequency range. For 3WM in the infrared (IR) region a detailed understanding of the first six vibrational bands of PO is necessary. 
Propylene oxide (PO) is one of the most discussed chiral molecules since its astronomical detection \footnote{\href{https://arxiv.org/abs/1606.07483}{doi:1606.07483}, B. A. McGuire et al., ''Discovery of the Interstellar Chiral Molecule Propylene Oxide (CH3CHCH2O)'',Science \textbf{352} (2016)}. For future applications such as chiral detection of PO by three-wave mixing techniques we would like to aquire its ro-vibrationally resolved spectrum.
In our investigations we found the ro-vibrationally resolved spectrum of PO to be quite complex and thus the assignment of ro-vibrational transitions relying solely on an IR cavity ring-down spectrometer not feasible. \\

In a first step we present the proof of principle concept of combining an IR cavity ring-down (2.7-4.0 \textmu m) and chirped-pulse Fourier transform millimeter wave (100-112 GHz) spectrometer to excite double resonance processes in jet-cooled N$_2$O. In our setup the three components IR, MW and molecular jet are each aligned along the axis of a cartesian coordinate system and both excitation sources are linearly polarized, the polarization angle of the IR source is freely adjustable. We observed rotational transitions in the vibrational ground state $(00^00)$, the first overtone of the symmetric stretching mode $(20^00)$ around 3.9 \textmu m and the combination band of symmetric and asymmetric stretching mode $(10^01)$ around 2.875 \textmu m\footnote{\href{https://pubs.acs.org/doi/abs/10.1021/ed085p121}{doi:10.1021/ed085p121}, M. Bryant, S. Reeve, W. Burns, ``Observation and Analysis of N2O Rotation Vibration Spectra'', J. Chem. Educ., \textbf{85} (2008)}.
Next a racemic mixture and pure enantiomers of PO are probed with the same setup. The double resonance procedure allows for precise assignment of the  ro-vibrationally resolved spectrum. Results will be compared to theoretical predictions.

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