l-HC4N
Cyanoethynylmethylene, X 3Σ
Species tag 063501
Version2
Date of EntryDec. 2004
ContributorH. S. P. Müller

The lines were reported by
(1) J. Tang, Y. Sumiyoshi, and Y. Endo, 1999, Chem. Phys. Lett. 315, 69.
There is no change in the input data with respect to the first entry from April 2000. However, an ab initio dipole moment was used. Moreover, the standard entry does not include 1H and 14N hyperfine splitting. However, this splitting may be resolved at low values of N. Therefore, predictions with 1H and 14N hyperfine splitting are available for N" < 10. NOTE: The partion function DOES take into account the hyperfine splitting !
The dipole moment is from an ab initio calculation by
(2) S. Ikuta, T. Tsuboi, and K. Aoki, 2000, J. Mol. Struct. (Theochem) 528, 297.

Lines Listed319
Frequency / GHz< 456
Max. J99
log STR0-8.0
log STR1-4.0
Isotope Corr.-0.021
Egy / (cm-1)0.0
 µa / D4.33
 µb / D 
 µc / D 
 A / MHz 
 B / MHz2302.398
 C / MHz 
 Q(300.0)48803.1863
 Q(225.0)36579.9194
 Q(150.0)24358.3696
 Q(75.00)12138.6984
 Q(37.50)6029.9163
 Q(18.75)2976.5104
 Q(9.375)1451.4502
detected in ISM/CSMyes


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