The Rotational Spectrum of TiO2

doi:10.1086/528934

The Astrophysical Journal

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S. Brünken et al. 2008 ApJ 676 1367 doi:10.1086/528934

The Rotational Spectrum of TiO₂

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S. Brünken^1,2, H. S. P. Müller^3,4,5, K. M. Menten⁴, M. C. McCarthy^1,2 and P. Thaddeus^1,2

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sbruenken@cfa.harvard.edu mccarthy@cfa.harvard.edu pthaddeus@cfa.harvard.edu hspm@ph1.uni-koeln.de kmenten@mpifr-bonn.mpg.de

¹ Harvard Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138
² School of Engineering and Applied Sciences, Harvard University, 29 Oxford Street, Cambridge, MA 02138
³ Physikalisches Institut, Universität zu Köln, Zülpicher Strasse 77, 50937 Köln, Germany
⁴ Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121 Bonn, Germany
⁵ Harvard visiting scientist 2006 July

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Abstract References

The rotational spectrum of titanium dioxide (TiO₂) has been detected by laser-ablation molecular beam Fourier transform microwave spectroscopy. Thirteen b-type rotational transitions up to J = 9 and K_a = 4 were measured for the most abundant isotopic species ⁴⁸TiO₂ in the frequency range 7-42 GHz with accuracies of 1-10 kHz, allowing for the precise determination of rotational and centrifugal distortion parameters. In addition, eight and six rotational transitions of the rare isotopic species ⁴⁶TiO₂ and ⁵⁰TiO₂, respectively, have been recorded in the same frequency range. From the derived spectroscopic parameters, rest frequencies of TiO₂ can now be calculated to better than 1 km s⁻¹ in equivalent radial velocity up to fairly high J and K_a at millimeter wavelengths, enabling radioastronomical searches for this stable, highly polar transition metal dioxide in space. Preliminary results of two searches for TiO₂ in space are presented.

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