Methylidynium, 1Σ+
Species tag 013503
Date of EntryApr. 2010
ContributorH. S. P. Müller

A combined fit of all available data of all isotopic species has been carried out with respect to the May 2009 entry; details are available in
(1) H. S. P. Müller, 2010, Astron. Astrophys. 514, Art. No. L6.
The J" = 0 transition frequencies of CH+, 13CH+, and CD+, were reported by
(2) T. Amano, 2010, Astrophys. J. 716, L1.
Additional rovibrational transitions between the electronic X and A states of four isotopologs as reported in (1) were also used in the fit. The CH+ data were taken from
(3) A. Carrington and D. A. Ramsay, 1982, Phys. Scr. 25, 272;
and from
(4) R. Hakalla, R. Kepa, W. Szajna, and M. Zachwieja, 2006, Eur. Phys. J. D 38, 481.
13CH+, CD+, and 13CD+ data were taken from
(5) Z. Bembenek, 1997, J. Mol. Spectrosc. 181, 136;
(6) Z. Bembenek, H. Cisak, R. Kepa, 1987, J. Phys. B 20, 6197;
and from
(7) Z. Bembenek, 1997, J. Mol. Spectrosc. 182, 439;
Predictions should be viewed with some caution; considerable caution is advised for transitions beyond J" = 10.
A ground state dipole moment value was calculated ab initio by
(8) M. Cheng, J. M. Brown, P. Rosmus, R. Linguerri, N. Komiha, and E. G. Myers, 2007, Phys. Rev. A 75, Art. No. 012502.

Lines Listed19
Frequency / GHz< 14790
Max. J19
log STR0-10.0
log STR1-10.0
Isotope Corr.-0.0
Egy / (cm–1)0.0
 µa / D1.683
 µb / D 
 µc / D 
detected in ISM/CSMyes

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