MgCCH
Magnesium monoacetylide, X 2Σ+
Species tag 049507
Version1*
Date of EntryOct. 2011
ContributorH. S. P. Müller

The lines have been reported by
(1) M. A. Brewster, A. J. Apponi, J. Xin, and L. M. Ziurys, 1999, Chem. Phys. Lett. 310, 411.
For low N transitions hyperfine splitting due to the 1H nucleus may be resolvable. Therefore, predictions at lower frequencies should be viewed with some caution. The predictions should be quite reliable at higher frequencies.
The dipole moment was taken from an ab initio calculation by
(2) D. E. Woon, 1996, Astrophys. J. 456, 602.
Note: The initial entry from Nov. 2000 contained a typographical error for the dipole moment which was also used in the calculation. The version number has been retained.

Lines Listed219
Frequency / GHz< 975
Max. J99
log STR0-6.7
log STR1-5.0
Isotope Corr.-0.1127
Egy / cm–10.0
 µa / D1.68
 µb / D 
 µc / D 
 A / MHz 
 B / MHz4965.335
 C / MHz 
 Q(300.0)2521.3650
 Q(225.0)1890.6552
 Q(150.0)1260.3024
 Q(75.00)630.3066
 Q(37.50)315.4427
 Q(18.75)158.0448
 Q(9.375)79.3555
detected in ISM/CSMyes


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