Propadienylidene, 1A1
Species tag 038501
Date of EntryJune 2002
ContributorH. S. P. Müller

The experimental data was reported by
(1) J. M. Vrtilek, C. A. Gottlieb, E. W. Gottlieb, T. C. Killian, and P. Thaddeus, 1990, Astrophys. J. 364, L53.
The predictions, in particular at higher J or Ka, should be viewed with some caution.
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 9.9720 cm–1 above ground.

Lines Listed981
Frequency / GHz< 1193
Max. J58
log STR0-8.3
log STR1-4.0
Isotope Corr.0.0
Egy / (cm-1)0.0
 µa / D4.1
 µb / D 
 µc / D 
 A / MHz288775
 B / MHz10588.64
 C / MHz10203.97
detected in ISM/CSMyes

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