# Browse Abstracts & Presentations - 2021 International Symposium on Molecular Spectroscopy by Subject "Rotational structure/frequencies"

• (International Symposium on Molecular Spectroscopy, 2021-06-24)
Recent advances in microwave spectroscopy, allowing for the measurement and fitting of thousands of spectral lines for a given chemical system, have prompted a need for high accuracy predictions of spectroscopic constants. ...

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• (International Symposium on Molecular Spectroscopy, 2021-06-24)
Despite the chemical richness of Orion KL, one of the ubiquitous aldehydes -- acetaldehyde (\chem{CH_3CHO}; AA) -- has been only tentatively identified toward this region. We have investigated an extensive ALMA archive ...

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• (International Symposium on Molecular Spectroscopy, 2021-06-24)
High resolution infrared absorption spectra of cyclohexane (C$_6$H$_{12}$) have been recorded from 1100 to 4000 cm$^{-1}$ at room temperature and 241 K. Cyclohexane is an oblate symmetric top with $D_{3d}$ symmetry. A ...

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• (International Symposium on Molecular Spectroscopy, 2021-06-24)
\begin{wrapfigure}{r}{0pt} \includegraphics[scale=0.14]{ETB234.eps} \end{wrapfigure} Simple aromatic molecules may be precursors for polycyclic aromatic hydrocarbons in space, and some of the simplest ones are now detected ...

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• (International Symposium on Molecular Spectroscopy, 2021-06-24)
The coupling of the quadrupolar moment of a nucleus to the molecular rotation causes hyperfine splitting of the rotational transitions, which provides important information about electronic environment and therefore chemical ...

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• (International Symposium on Molecular Spectroscopy, 2021-06-24)
Thiophene is a five-membered, aromatic heterocycle with $\textit{C}_{2v}$ symmetry and a moderate dipole (\chem{C_4H_4S}, $\mu_a$ = 0.55 D). A number of fundamental states of thiophene had previously been investigated ...

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• (International Symposium on Molecular Spectroscopy, 2021-06-24)
In the last year, a paper was published by our group describing a multi-antenna detection, chirped-pulse Fourier transform microwave (MAD-CP-FTMW) spectrometer. A talk will also be given at this conference regarding this ...

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• (International Symposium on Molecular Spectroscopy, 2021-06-24)
2-Cyclopropylideneacetonitrile (\chem{C_5H_5N}, C$_{s}$, $\mu$$_{a} = 4.4 D, \mu$$_{b}$ = 1.2 D) is a nitrile-containing structural isomer of pyridine. While pyridine has not been detected in the interstellar medium, ...

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• (International Symposium on Molecular Spectroscopy, 2021-06-24)
\begin{wrapfigure}{r}{0pt} \includegraphics[width=0.28\textwidth,trim={8.5cm 2.2cm 8.5cm 2.2cm},clip]{1.eps} \end{wrapfigure} The two isomers (\textit E and \textit Z) of the aromatic imine phenylmethanimine (PMI) have ...

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• (International Symposium on Molecular Spectroscopy, 2021-06-24)
We collected the rotational spectrum of chlorobenzene (\chem{C_6H_5Cl}, $\mu$ = 1.7117(14) D) in the frequency range of 130 – 360 GHz. For the [$^{35}$Cl]- and [$^{37}$Cl]- isotopologues, the ground states and a total of ...

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• (International Symposium on Molecular Spectroscopy, 2021-06-24)
Isoprene also known as 2-methyl-1,3-butadiene (CH$_{2}$=C(CH$_{3}$)-CH=CH$_{2}$) is a biologically important unsaturated hydrocarbon produced by many plants and animals. For example, it is present in exhaled human breath ...

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• (International Symposium on Molecular Spectroscopy, 2021-06-24)
2-chloroethanol, the simplest chlorohydrin, is known to exist in 5 distinct conformers. The lowest energy conformer is gauche-gauche, designating the internal rotation around the C-C bond and the C-O bond, respectively. ...

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• (International Symposium on Molecular Spectroscopy, 2021-06-24)
Diacetyl is a common food flavoring, used most commonly in microwave popcorn. In addition to being a molecule of culinary significance, diacetyl is also a molecule of atmospheric interest, as it is an important source of ...

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• (International Symposium on Molecular Spectroscopy, 2021-06-24)
2-Cyanopyrimidine and 2-cyanopyrazine are attractive molecules for interstellar detection via radioastronomy because they are the pyrimidine and pyrazine analogs of the detected interstellar molecule, benzonitrile, and ...

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