HeH+
Helium hydride cation, 1Σ+
Species tag 005502
Version1*
Date of EntryApril 2008
ContributorH. S. P. Müller

Pure rotational as well as rovibrational data of several isotopic species of ArH+ have been fit simultaneously.
The J" = 0 and 1 transition frequency were reported in
(1) F. Matsushima, T. Oka, and K. Takagi, 1997, Phys. Rev. Lett., 78, 1664.
Additional rotational transitions have been measured with accuracies of about 150 MHz or somewhat better. J" = 6 was recorded by
(2) D. J. Liu, W. C. Ho, and T. Oka, 1987, J. Chem. Phys. 87, 2442.
J" = 10 – 18 were taken from
(3) Z. Liu and P. B. Davis, 1997, J. Chem. Phys. 107, 337.
Transition frequencies from (2) and (3) have not been merged. The transitions should deviate from the predictions by less than three to five time the uncertainties because of the extensive input data set.
A ground state dipole moment value was published in
(4) M. Pavanello, S. Bubin, M. Molski, and L. Adamowicz, 2005, J. Chem. Phys. 123, Art. No. 104306.

Lines Listed18
Frequency / GHz< 26456
Max. J18
log STR0-20.0
log STR1-20.0
Isotope Corr.-0.0
Egy / (cm-1)0.0
 µa / D1.664
 µb / D 
 µc / D 
 A 
 B1006063.6
 C 
 Q(1000.)21.4787
 Q(500.0)10.8010
 Q(300.0)6.5954
 Q(225.0)5.0294
 Q(150.0)3.4723
 Q(75.00)1.9384
 Q(37.50)1.2313
 Q(18.75)1.0175
 Q(9.375)1.0001
detected in ISM/CSMno


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