HC18O+
Oxomethylium, formyl cation; 18O isotopomer
Species tag 031506
Version1
Date of EntryDec. 2004
ContributorH. S. P. Müller

The J = 3 – 2 transition was reported by
(1) G. M. Plummer, E. Herbst, and F. C. De Lucia, 1983, Astrophys. J., 270, L99.
The J = 1 – 0 transition is from an astronomical observation by
(2) J. Schmid-Burgk, D. Muders, H. S. P. Müller, and B. Brupbacher-Gatehouse; 2004, Astron. Astrophys., 419 949.
Predictions, in particular to high frequencies, should be viewed with some caution because of the small number of lines in the fit.
The dipole moment is assumed to agree with that of the main isotopic species, see e029507.cat.

Lines Listed46
Frequency / GHz< 3888
Max. J46
log STR0-4.0
log STR1-6.0
Isotope Corr.-2.693
Egy / (cm–1)0.0
 µa / D3.90
 µb / D 
 µc / D 
 A / MHz 
 B / MHz42581.26
 C / MHz 
 Q(300.0)147.2117
 Q(225.0)110.4779
 Q(150.0)73.7540
 Q(75.00)37.0402
 Q(37.50)18.6883
 Q(18.75)9.5161
 Q(9.375)4.9361
 Q(5.000)2.8097
 Q(2.725)1.7259
detected in ISM/CSMyes


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