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Issue A&A
Volume 441, Number 3, October III 2005
Page(s) 1039 - 1041
Section Interstellar and circumstellar matter
DOI http://dx.doi.org/10.1051/0004-6361:20053260



A&A 441, 1039-1041 (2005)
DOI: 10.1051/0004-6361:20053260

Laboratory measurement of the J, K = $\mathsf{1,0^{-}{-}0,0^{+}}$ transition of ortho-D $\mathsf{{_3}}$O $\mathsf{^{+}}$

T. Furuya and S. Saito

Research Center for Development of Far-Infrared Region, Fukui University, Bunkyo, Fukui 910-8507, Japan
    e-mail: [furuya;ssaito]@fir.fukui-u.ac.jp

(Received 19 April 2005 / Accepted 17 May 2005)

Abstract
The J,K=1,0--0,0+ transition of ortho-D3O+ was measured by laboratory submillimetre-wave spectroscopy using a source-modulated spectrometer combined with a hollow-cathode free-space cell. The D3O+ ion was generated by a dc glow discharge of D2O. A single line, which showed characteristic behaviour of a molecular ion, was observed at exactly the frequency predicted by the molecular constants previously determined by Araki et al. (1999, Mol. Phys., 97, 177). The measured line frequency was corrected for the ion-drift Doppler shift and determined to be 798 713.814 $\pm$ 0.077 MHz with one standard error of the measurements in parentheses. The lowest J,K transition of ortho-D3O+ can be used as a probe to investigate the ortho to para ratio or the ortho and para to meta ratio of interstellar D3O+ in highly depleted molecular cores.


Key words: molecular data -- line: identification -- ISM: molecules

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© ESO 2005


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