Biology
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...652.1787a&link_type=abstract
The Astrophysical Journal, Volume 652, Issue 2, pp. 1787-1795.
Biology
5
Astrobiology, Astrochemistry, Ism: Abundances, Ism: Individual: Name: Sagittarius B2, Ism: Molecules, Line: Identification, Methods: Laboratory
Scientific paper
A combined laboratory and astronomical investigation has been conducted on the methyl sugar hydroxyacetone (CH3COCH2OH). Rotational transitions of this species in the ground torsional state (vt=0) were recorded using both millimeter-wave direct absorption techniques and Fourier transform microwave spectroscopy. A total of 1145 lines of CH3COCH2OH were analyzed in the frequency range 4 to 180 GHz, including transitions arising from both A- and E-symmetry species. A modified rho-axis method Hamiltonian was needed for the analysis because of the presence of perturbations resulting from the torsional motion of the methyl group in this molecule. Assignment of the E-species was particularly problematic as a consequence of significant mixing between the ground and torsionally excited levels. The complete data set was fitted using 21 spectroscopic parameters and had a global rms of 90 kHz; the barrier to internal rotation was established to be 65.3560(22) cm-1. An astronomical search was subsequently conducted for hydroxyacetone at 2 and 3 mm using the 12 m telescope of the Arizona Radio Observatory. Twenty-eight favorable transitions arising from both A- and E-species, each consisting of collapsed quartets, were searched for toward Sgr B2(N). Although credible features were detected at several frequencies of hydroxyacetone, there were a sufficient number of missing lines to rule out an interstellar detection. An upper limit to the column density of Ntot<5×1012 cm-2 was derived for CH3COCH2OH in Sgr B2(N), indicating that this species is an order of magnitude less abundant than glycolaldehyde (CH2OHCHO).
Apponi Aldo Joseph
Brewster Matthew A.
Halfen DeWayne T.
Hoy J. J.
Ziurys Lucy M.
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