HC(18O)NH2
Formamide, 18O isotopolog
Species tag 047508
Version1*
Date of EntryMay 2009
ContributorH. S. P. Müller

The experimental frequencies have been reported by
(1) A. V. Kryvda, V. G. Gerasimov, S. F. Dyubko, E. A. Alekseev, R. A. Motiyenko, 2009, J. Mol. Spectrosc. 254, 28.
Additional microwave transitions were also considered. These were taken from
(2) M. Stubgaard, PhD thesis, 1978, Københavns Universitet.
Claus Nielsen and Matt Johnson are thanked for providing the data from (2).
Apr. 2013: The data from (2) have been merged as far as they did not display hyperfine structure. In addition, the correct partition function values are provided here.
Several higher order distortion terms have been estimated.
Predictions with uncertainties larger than 0.3 MHz should be viewed with caution. It is conceivable that the predictions are accurate enough for astronomical observations.
14N hyperfine splitting may be resolved for low values of J. Therefore, a separate hyperfine calculation is provided for J" = J' ≤ 10 and frequencies below 100 GHz along with partition function values.
Vibrational contributions to the partition function will be provided.
The dipole moment was assumed to agree with that of the main isotopolog, which was determined by
(3) R. J. Kurland and E. B. Wilson, 1957, J. Chem. Phys. 27, 585.

Lines Listed6666
Frequency / GHz< 2000
Max. J80
log STR0-7.5
log STR1-5.5
Isotope Corr.-2.695
Egy / (cm–1)0.0
 µa / D3.616
 µb / D0.852
 µc / D 
 A / MHz71899.9
 B / MHz10775.89
 C / MHz9370.07
 Q(500.0)22194.6768
 Q(300.0)10304.8110
 Q(225.0)6691.2526
 Q(150.0)3641.8177
 Q(75.00)1288.2804
 Q(37.50)456.2855
 Q(18.75)161.9520
 Q(9.375)57.7191
 Q(5.000)22.8023
 Q(2.725)9.4209
detected in ISM/CSMyes


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