Lamb-dip spectrum of methylacetylene and methyldiacetylene: precise rotational transition frequencies and parameters of the main isotopic species

Details Lamb-dip spectrum of methylacetylene and methyldiacetylene: precise rotational transition frequencies and parameters of the main isotopic species Lamb-dip spectrum of methylacetylene and methyldiacetylene: precise rotational transition frequencies and parameters of the main isotopic species

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008a%26a...487.1197c&link_type=abstract

Astronomy and Astrophysics, Volume 487, Issue 3, 2008, pp.1197-1202

Astronomy and Astrophysics

Astrophysics

6

Techniques: Spectroscopic, Molecular Data, Methods: Laboratory, Ism: Molecules, Radio Lines: Ism

Scientific paper

Context: Methylacetylene and methyldiacetylene are the first members of the methylpolyynes series, CH3C{2n}H (n = 1, 2). Their astrophysical relevance has motivated this spectroscopic study. Aims: The aim of this investigation is to provide very accurate rest frequencies, as well as to improve the spectroscopic parameters available in the literature for these molecules. Methods: The Lamb-dip technique was exploited in order to record the rotational spectra of CH3CCH and CH3CCCCH at sub-Doppler resolution in the millimeter- and submillimeter-wave frequency ranges. In addition, for CH3CCH rotational transitions in the THz region were recorded at Doppler resolution. Results: We report the most accurate ground-state rotational parameters known at the moment for the main isotopic species of methylacetylene, as well as of methyldiacetylene. Conclusions: Since both molecules are known to be of astrophysical relevance, we are confident that the improvement in the accuracy of the ground-state rotational parameters as well as of the rest frequencies of rotational transitions could be useful for future observations purposes.

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