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The 4051 Å Comet Band of 13C3

Published online by Cambridge University Press:  21 February 2014

M.A. Haddad ,
D. Zhao ,
H. Linnartz  and
W. Ubachs
M.A. Haddad
Affiliation:
Department of Physics and Astronomy, VU University Amsterdam, De Boelelaan 1081, NL 1081HV Amsterdam, The Netherlands. email: [email protected], [email protected]
D. Zhao
Affiliation:
Sackler Laboratory for Astrophysics, Leiden Observatory, University of Leiden, PO Box 9513, NL 2300 RA Leiden, The Netherlands. email: [email protected], [email protected]
H. Linnartz
Affiliation:
Department of Physics and Astronomy, VU University Amsterdam, De Boelelaan 1081, NL 1081HV Amsterdam, The Netherlands. email: [email protected], [email protected] Sackler Laboratory for Astrophysics, Leiden Observatory, University of Leiden, PO Box 9513, NL 2300 RA Leiden, The Netherlands. email: [email protected], [email protected]
W. Ubachs
Affiliation:
Department of Physics and Astronomy, VU University Amsterdam, De Boelelaan 1081, NL 1081HV Amsterdam, The Netherlands. email: [email protected], [email protected]
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Abstract

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The tricarbon C3 molecule has been detected in a number of translucent interstellar clouds via its $A^1\Pi_{u}-X^1\Sigma_{g}^{+}$ (000-000) electronic ‘comet’ band around 4051 Å. So far, it is the largest molecule unambiguously identified in the diffuse interstellar medium. In this work, rotationally resolved laboratory spectra are presented for the corresponding transition of the 13C3 isotopologue. The spectra are recorded in direct absorption using cavity ring-down spectroscopy in combination with a supersonic plasma jet. A rotational analysis yields accurate spectroscopic parameters. In contrast to 12C3, no significant perturbations are found for (e− or f-parity) levels up to J' = 18 in the A1Π upper electronic state.

Keywords

methods: laboratoryISM: moleculesmolecular data13C3.
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S297: The Diffuse Interstellar Bands , May 2013 , pp. 297 - 299
Copyright
Copyright © International Astronomical Union 2014 

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