The 4051 Å comet band of 13C3

M. A. Haddad, D. Zhao, H. Linnartz, W. Ubachs

Research output: Contribution to JournalArticleAcademicpeer-review


The tricarbon C3 molecule has been detected in a number of translucent interstellar clouds via its A1Π-X1Σ 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 A 1Π upper electronic state.

Original languageEnglish
Pages (from-to)297-299
Number of pages3
JournalProceedings of the International Astronomical Union
Issue numberS297
Publication statusPublished - Feb 2014


  • C .
  • ISM: molecules
  • methods: laboratory
  • molecular data

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