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Title:High-resolution Infrared Spectroscopy Of Dc3n In The Stretching Region
Author(s):Jiang, Ningjing
Contributor(s):Puzzarini, Cristina; Guillemin, J.-C.; Fedele, Davide; Canè, Elisabetta; Dore, Luca; Bizzocchi, Luca; Tamassia, Filippo; Melosso, Mattia
Abstract:\begin{wrapfigure}{r}{0pt} \includegraphics[scale=0.7]{Figure99.eps} \caption{Portions of the recorded MIR spectra (black traces): 1930-2300~cm$^{-1}$, 2500-2700~cm$^{-1}$ and 3250-3400~cm$^{-1}$. Spectral simulations based on the spectroscopic constants for both DC$_3$N (violet traces) and HC$_3$N (green traces) } \end{wrapfigure} Interstellar deuterated cyanoacetylene (DC$_3$N) has been identified in a vast variety of astronomical sources thanks to the emission of its rotational transitions. To date, the rotational spectrum of DC$_3$N has been accurately studied in laboratory, while the high-resolution infrared spectrum is limited to the low frequency range (200--1100~cm$^{-1}$). In order to support the identification of DC$_3$N in different spectral regions, we have investigated the infrared spectrum of DC$_3$N in the stretching region (1500--3500~cm$^{-1}$). The $\nu_1$, $\nu_2$, and $\nu_3$ fundamentals as well as their hot-bands were recorded at 0.004 cm$^{-1}$ resolution using a Fourier transform infrared spectrometer. Additional pure rotational spectra in the $v_3 =1$, $v_2 =1$, and $v_3 = v_7 =1$ vibrational excited states were observed between 243 and 295 GHz with a frequency-modulation millimeter/submillimeter-wave spectrometer equipped with an electric furnace. The precision of the pure rotational lines, intrinsically much higher than ro-vibrational data, allowed us to improve the accuracy of the upper state spectroscopic parameters. The rotational and ro-vibrational data of DC$_3$N were combined into a single fit from which a consistent set of spectroscopic constants has been determined. In addition, the ro-vibrational features of its parent species (HC$_3$N) have been analyzed as well because HC$_3$N is observed as a by-product in the same spectra. The result of the combined analysis provides a highly-precise rest-frequency catalog that can be used to model the infrared spectra of DC$_3$N and HC$_3$N.
Issue Date:2021-06-23
Publisher:International Symposium on Molecular Spectroscopy
Genre:Conference Paper / Presentation
Date Available in IDEALS:2021-09-24

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