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The Submillimeter-wave Spectrum of the Formaldehyde Isotopomer H2

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The Submillimeter-wave Spectrum of the Formaldehyde Isotopomer H

2

C

18

O in its Ground Vibrational State

Holger S. P. M¨uller, Ralf Gendriesch, Frank Lewen, and Gisbert Winnewisser

I. Physikalisches Institut, Universit¨at zu K¨oln, Z¨ulpicher Str. 77, D-50937 K¨oln Reprint requests to Prof. G. W. or Dr. H. S. P. M.; Fax: +49 221 470 5162;

E-mail: winnewisser@ph1.uni-koeln.de or hspm@zeus.ph1.uni-koeln.de Z. Naturforsch. 55 a, 486–490 (2000); received February 11, 2000

The ground state rotational spectrum of H2C18O has been studied between 485 and 835 GHz with a sample of natural isotopic composition. Additional lines have been recorded around 130 GHz and near 1.85 THz, using a recently developed far-infrared laser-sideband spectrometer. The accurate new line frequencies were fit together with previously published data to obtain greatly improved spectroscopic constants. Both Watson’s S and Areduced Hamiltonians have been employed yielding the rotational constantsAS = 281 961.215 (82),BS = 36 902.275 51 (36),CS = 32 513.405 89 (36),AA = 281 961.371 (82),BA = 36 904.173 32 (91), andCA = 32 511.524 65 (86) MHz, respectively.

Key words: Rotational Spectroscopy; Interstellar Molecule; Astrophysics; Astrochemistry;

Reduced Hamiltonian.

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