# Browse Abstracts & Presentations - 2014 International Symposium on Molecular Spectroscopy by Subject "Astronomy"

• (International Symposium on Molecular Spectroscopy, 2014-06-16)
The linear triatomic carbon (C$_3$), one of the most important molecules that have been identified in both dense and diffuse interstellar environments, has attracted great interest to astronomers and astrochemists. It is ...

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Microsoft PowerPoint 2007 (2MB)
• (International Symposium on Molecular Spectroscopy, 2014-06-17)
For cool stellar and substellar objects, atomic lines weaken, and detailed elemental and isotopic abundances are often derived from molecular absorption features. We have embarked on a project to provide molecular line ...

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Microsoft PowerPoint 2007 (2MB)
• (International Symposium on Molecular Spectroscopy, 2014-06-16)
By observing the astronomical masers in the Milky Way we can determine for instance high-accurate distances of the hosting Galactic sources (e.g., Galactic star-forming regions) and the kinematic of the gas where the masers ...

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Microsoft PowerPoint 2007 (4MB)
• (International Symposium on Molecular Spectroscopy, 2014-06-17)
Astronomical observation of dimethyl ether,\footnote{Z.~Peeters, S.~D.~Rodgers, S.~B.~Charnley, L.~Schriver-Mazzuoli, A.~Schriver, J.~V.~Keane, and P.~Ehrenfreund, \textit{Astron. \& Astrophys.} \textbf{2006}, \textit{445}, ...

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Microsoft PowerPoint 2007 (6MB)
• (International Symposium on Molecular Spectroscopy, 2014-06-16)
The CH$^+$ ion was one of the first molecules identified in the interstellar gas more than 75 years ago, but the high observed abundances of CH$^+$ remain a puzzle, because the main reaction proposed for the formation of ...

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Microsoft PowerPoint 2007 (6MB)
• (International Symposium on Molecular Spectroscopy, 2014-06-16)
Diffuse interstellar bands (DIBs) still remain the longest standing unsolved problem in spectroscopy and astrochemistry, although several hundreds of DIBs have been already detected. It is expected that identifications of ...

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Microsoft PowerPoint 2007 (2MB)
• (International Symposium on Molecular Spectroscopy, 2014-06-16)
From observed high H$_3^+$ column densities in the Central Molecular Zone (CMZ), a region with a radius of $\sim$150~pc at the center of our Milky Way Galaxy, H$_2$ ionization rates of $\zeta$~$\sim$~3~$\times$~10$^{- ... application/vnd.openxmlformats-officedocument.presentationml.presentation Microsoft PowerPoint 2007 (1MB) • (International Symposium on Molecular Spectroscopy, 2014-06-17) Polycyclic Aromatic Hydrocarbons (PAHs) have long been suspected to be the carriers of so called Unidentified Infrared Bands (UIBs).\footnote{A. Leger, J. L. Puget, \textit{Astron. Astrophys.} \textbf{137}, L5-L8 (1984); ... application/vnd.openxmlformats-officedocument.presentationml.presentation Microsoft PowerPoint 2007 (3MB) • (International Symposium on Molecular Spectroscopy, 2014-06-17) The urea molecule, (NH$_2$)$_2$CO, has a complex potential energy surface resulting from a combination of the NH$_2$torsion and NH$_2$inversion motions. This leads to a distribution of lowest vibrational states that ... application/vnd.openxmlformats-officedocument.presentationml.presentation Microsoft PowerPoint 2007 (1MB) • (International Symposium on Molecular Spectroscopy, 2014-06-17) Astrochemical models of interstellar chemistry predict the formation of many complex molecules of prebiotic interest, including aminomethanol (HOCH$_2$NH$_2$). Aminomethanol has been proposed as the gas-phase interstellar ... application/vnd.openxmlformats-officedocument.presentationml.presentation Microsoft PowerPoint 2007 (9MB) • (International Symposium on Molecular Spectroscopy, 2014-06-17) Ions and radicals are important in astrochemical models because they act as key reaction intermediates in the interstellar medium. However, much laboratory work remains to determine the rotational spectra of most ions and ... application/vnd.openxmlformats-officedocument.presentationml.presentation Microsoft PowerPoint 2007 (3MB) • (International Symposium on Molecular Spectroscopy, 2014-06-17) Glycolic acid, HOCH$_2$COOH is the simplest$\alpha$-hydroxy acid. It is as yet undetected in the interstellar medium, but is known to be present in carbonaceous meteorites and in residues from UV-photolysed interstellar ... application/vnd.openxmlformats-officedocument.presentationml.presentation Microsoft PowerPoint 2007 (785kB) • (International Symposium on Molecular Spectroscopy, 2014-06-16) Electronic transitions of polar linear molecules have been modeled and compared to archival high resolution spectra of the diffuse interstellar bands (DIBs) at 5797 and 6613 \AA. These two bands are notable for fine structure ... application/vnd.openxmlformats-officedocument.presentationml.presentation Microsoft PowerPoint 2007 (1MB) • (International Symposium on Molecular Spectroscopy, 2014-06-16) Interstellar matter is not inert, but is constantly evolving. On the one hand, its physical characteristics such as its density and its temperature, and on the other hand, its chemical characteristics such as the abundances ... application/pdf PDF (717kB) • (International Symposium on Molecular Spectroscopy, 2014-06-16) Near the Galactic center, the presence of the supermassive black hole, high dust temperatures, and large densities produce an unique environment within our galaxy. Unfortunately, optical light in this region is obscured ... application/pdf PDF (3MB) • (International Symposium on Molecular Spectroscopy, 2014-06-16) We are conducting experiments on the DESIRS beam-line at the SOLEIL Synchrotron to acquire the necessary data on oscillator strengths and predissociation rates for modeling CO photochemistry in astronomical environments. ... application/pdf PDF (2MB) • (International Symposium on Molecular Spectroscopy, 2014-06-17) Chemical reactions involving the icy mantles of interstellar dust grains have been invoked in astrochemical models to explain the formation of complex organic molecules in interstellar clouds. Interstellar ices can act ... application/vnd.openxmlformats-officedocument.presentationml.presentation Microsoft PowerPoint 2007 (1MB) • (International Symposium on Molecular Spectroscopy, 2014-06-17) Urea is an important terrestrial bio-molecule, which has been tentatively detected in the interstellar medium \footnote{Remijan, A.J., L.E. Snyder, B.A. McGuire, H.-L. Kuo, L.W. Looney, D.N. Friedel, G.Y. Golubiatnikov, ... application/vnd.openxmlformats-officedocument.presentationml.presentation Microsoft PowerPoint 2007 (13MB) • (International Symposium on Molecular Spectroscopy, 2014-06-16) Although molecules with a wide range of sizes exist in dense clouds (e.g. H(C$\equiv$C)$_n$C$\equiv$N with$n$~=~0~$-\$~5), molecules identified in diffuse clouds are all small ones. Since the initial discovery of CH, ...

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Microsoft PowerPoint 2007 (3MB)
• (International Symposium on Molecular Spectroscopy, 2014-06-16)
Observations were made of a number of carbon-rich circumstellar envelopes using the Phoenix spectrograph on the Gemini South telescope to determine the presence of small carbon chain molecules. The circumstellar envelope ...

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Microsoft PowerPoint 2007 (4MB)