Oxoniumylidene, hydroxylium, X 3Σ
Species tag 017501
Date of EntryJan. 2016
ContributorH. S. P. Müller

New v = 1 – 0 infrared data with megahertz were included in the initial fit to improve the first entry from Apr. 2003. Details of the new fit as well as the data are presented in
(1) C. R. Markus, J. M. Hodges, A. J. Perry, G. S. Kocheril, H. S. P. Müller, and B. J. McCall, 2016, Astrophys. J. 817, Art. No. 138.
The N = 1 – 0 rotational transition frequencies with HFS splitting were taken from
(2) J. P. Bekooy, P. Verhoeve, W. L. Meerts, and A. Dymanus, 1985, J. Chem. Phys. 82, 3868.
The N = 13 – 12 transition frequencies with FS splitting were reported in
(3) D.-L. Liu, W.-C. Ho, and T. Oka, 1987, J. Chem. Phys. 87, 2442.
Vibration-rotation transitions up to v = 5 – 4 were also included in the fit. These were published in
(4) B. D. Rehfuss, M.-F. Jagod, L.-W. Xu, and T. Oka, 1992, J. Mol. Spectrosc. 151, 59.
The predictions had been accurate enough for moderate resolution spectrometers (e.g. PACS@Herschel). They may now be accurate enough for high resolution spectrometers (e.g. GREAT@SOFIA).
The electric dipole moment is from an ab initio calculation by
(5) H.-J. Werner, P. Rosmus, and E.-A. Reinsch, 1983, J. Chem. Phys. 79, 905.

Lines Listed430
Frequency / GHz< 19339
Max. J22
log STR0-15.0
log STR1-15.0
Isotope Corr.-0.0
Egy / (cm–1)0.0
 µa / D2.256
 µb / D 
 µc / D 
 A / MHz 
 B / MHz492346.31
 C / MHz 
detected in ISM/CSMyes

Database maintained by Holger S. P. Müller and Sven Thorwirth, programming by D. Roth and F. Schloeder