MgC4H+
Butadiynyliummagnesium, X 1Σ+
Species tag 073507
Version1*
Date of EntryApr. 2023
ContributorH. S. P. Müller

The astronomical lines have been reported by
(1) J. Cernicharo, C. Cabezas, J. R. Pardo, M. Agúndez, O. Roncero, B. Tercero, N. Marcelino, M. Guélin, Y. Endo, and P. de Vicente, 2023, Astron. Astrophys. 672, Art. No. L13.
The calculations should be quite reliable up to 150 GHz.
The dipole moment was taken from a quantum chemical calculation in (1).
Its value should be viewed with some caution.

Lines Listed69
Frequency / GHz< 200
Max. J69
log STR0-6.5
log STR1-1.7
Isotope Corr. 
Egy / cm–10.0
 µa / D13.5
 µb / D 
 µc / D 
 A / MHz 
 B / MHz1448.60
 C / MHz 
 Q(300.0)4317.1495
 Q(225.0)3237.6391
 Q(150.0)2158.3330
 Q(75.00)1079.2312
 Q(37.50)539.7569
 Q(18.75)270.0389
 Q(9.375)135.1849
 Q(5.000)72.2544
 Q(2.725)39.5314
detected in ISM/CSMyes


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