Propadienylidene, 1A1, 13C on C2
Species tag 039503
Date of EntryJune 2002
ContributorH. S. P. Müller

The experimental data was reported by
(1) C. A. Gottlieb, T. C. Killian, P. Thaddeus, P. Botschwina, J. Flügge, and M. Oswald, 1993, J. Chem. Phys. 98, 4478; and from
(2) M. C. Mc. Carthy and P. Thaddeus, 2002, J. Mol. Spectrosc. 211, 235.
The predictions, in particular at higher J or Ka, should be viewed with some caution. 13C nuclear spin-rotation splitting may be resolvable at low values of J. Respective data are from (2).
The dipole moment is from a quantum chemical calculation.
At low temperatures, it may be necessary to discern between ortho-l-C3H2 and para-l-C3H2. The ortho states are described by Ka odd, the para states by Ka even. The nuclear spin-weights are 3 and 1 for ortho-l-C3H2 and para-l-C3H2, respectively. The JKaKc = 111 is the lowest ortho state. It is approximately 9.976 cm–1 above ground.

Lines Listed1488
Frequency / GHz< 1045
Max. J50
log STR0-6.5
log STR1-3.7
Isotope Corr.-1.965
Egy / (cm-1)0.0
 µa / D4.1
 µb / D 
 µc / D 
 A / MHz288909
 B / MHz10584.69
 C / MHz10200.49
detected in ISM/CSMnot yet

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