HC15N, v = 0
Hydrogen Cyanide, 15N isotopolog, v = 0
Species tag 028506
Date of EntryDec. 2017
ContributorH. S. P. Müller

The first entry from Aug. 2005 has been revised considerably. Additional infrared data involving states v2 = 2 and 3 as well as v3 = 1 and v1 = 1 were included along with additional pure rotational data pertaining to v2 = 2 and 3 as well as v3 = 1. All these data were subjected to one combined fit.
Pure rotational transition frequencies for v = 0 and v2 = 1 were taken from
(1) U. Fuchs, S. Brünken, G. W. Fuchs, S. Thorwirth, V. Ahrens, F. Lewen, S. Urban, T. Giesen, G. Winnewisser, 2004, Z. Naturforsch., 59a, 861.
Additional v = 0 frequencies were publised in
(2) G. Cazzoli, C. Puzzarini, and J. Gauss, 2005, Astrophys. J. Suppl. Ser. 159, 181.
The v2 = 1 direct-l-type transitions were reported by
(3) M. Winnewisser and J. Vogt, 1978, Z. Naturforsch., 33a, 1323.
Higher vibrational state rotational data were taken from
(4) J. Preusser and A. G. Maki, 1993, J. Mol. Spectrosc. 162, 484.
Finally, extensive infrared data come from
(5) A. G. Maki, G. C. Mellau, S. Klee, M. Winnewisser, and W. Quapp, 2000, J. Mol. Spectrosc. 202, 67.
The main improvement occured in the partition function, which is essentially converged at 300 K and probably still good up to about 500 K. The rotational part is well converged up to 1000 K. The frequencies are also better at higher values of J. Predictions should be reliable throughout, but should be viewed with some caution above 3 THz.
The dipole moment was assumed to agree with that of the main isotopic species, see e027501.cat.
The 15N hyperfine splitting of about 20.6 kHz (2 : 1 intensity ratio) in the 1 – 0 transition is likely too small to be of relevance in radio-astronomical observations. At higher J, this splitting decreases rapidly towards 13.7 kHz.
The partition function takes into account all vibrational states used in the fit.

Lines Listed79
Frequency / GHz< 6638
Max. J79
log STR0-18.0
log STR1-18.0
Isotope Corr.-2.444
Egy / (cm–1)0.0
 µa / D2.9852
 µb / D 
 µc / D 
detected in ISM/CSMyes

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