Laboratory Characterization And Astrophysical Detection In Orion Kl Of Higher Excited Vibrational States Of Vinyl Cyanide

Kisiel, Zbigniew

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https://hdl.handle.net/2142/50922 Copy

Description

Title

Laboratory Characterization And Astrophysical Detection In Orion Kl Of Higher Excited Vibrational States Of Vinyl Cyanide

Author(s)

Kisiel, Zbigniew

Contributor(s)

• Calcutt, Hannah
• Viti, Serena
• Marcelino, Nuria
• Daly, Adam M.
• Drouin, Brian
• Neese, Christopher F.
• Medvedev, Ivan
• Alonso, José L.
• Bermúdez, Celina
• Pszczółkowski, Lech
• Cernicharo, Jose
• Tercero, Belén
• López, Alicia

Issue Date

2014-06-18

Keyword(s)

Mini-symposium: Astronomical Molecular Spectroscopy in the Age of ALMA

Abstract

Vinyl cyanide (acrylonitrile, H$_2$C=CHC$\equiv$N) is an interstellar molecule that was classified as a 'weed' since transitions in its isotopic species and vibrationally excited states have already been detected and need to be accounted for in searches for complex organic molecules. Presently we extend the systematic analysis of the laboratory rotational spectrum of vinyl cyanide to 9 new excited vibrational states with vibrational energies above 550 cm$^{-1}$ (785K). The spectroscopic analysis is based on the broadband 50-1900 GHz spectrum combined from results from the participating spectroscopic laboratories and covering a total of 1235 GHz. The studied states come in the form of polyads of perturbing vibrational states, and such perturbations also affect the strong, low-$K_a$ transitions used for astrophysical detection. It is therefore crucial to account for such effects in order to produce reliable linelists. The experimental data for three new polyads were fitted to experimental accuracy using Coriolis and Fermi perturbation models. Multiple transitions in the lowest of these polyads (and in other excited vibrational states and isotopic species of vinyl cyanide) were detected in the millimetre survey of the Orion-KL Nebula made with the IRAM 30-m radiotelescope.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

Permalink

http://hdl.handle.net/2142/50922

DOI

https://doi.org/10.15278/isms.2014.WF11

Copyright and License Information

Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/

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