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Title:
Laboratory measurement of the rotational spectrum of HCCS
Authors:
Vrtilek, J. M.; Gottlieb, C. A.; Gottlieb, E. W.; Wang, W.; Thaddeus, P.
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA), AB(Harvard University, Cambridge, MA), AC(Harvard University, Cambridge, MA), AD(Harvard-Smithsonian Center for Astrophysics, Cambridge, MA), AE(Harvard-Smithsonian Center for Astrophysics; Harvard University, Cambridge, MA)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 398, no. 1, p. L73-L76. (ApJL Homepage)
Publication Date:
10/1992
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Astronomical Spectroscopy, Free Radicals, Rotational Spectra, Thiols, Alkynes, Carbon 13, Laboratories, Molecular Structure, Sulfur Isotopes
DOI:
10.1086/186580
Bibliographic Code:
1992ApJ...398L..73V

Abstract

From laboratory measurement of more than 50 lines in the 76-394 GHz range, we have identified the rotational spectrum of the linear HCCS radical in its 2 Pi ground state. The standard Hamiltonian for an isolated 2 Pi state fits our measurements to high accuracy - a small fraction of a line width - and the derived spectroscopic constants predict lines of radio astronomical interest to better than 0.1 km/s, with the exception of hyperfine structure, so far unobserved but probably resolvable in astronomical sources in the lowest frequency rotational transitions. Detections of the isotopic species DCCS, HC13CS, and HCC34S confirm our identification of HCCS.

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