Ammonia, singly deuterated isotopic species with 15N
Species tag 019504
Date of EntrySep. 2008
ContributorH. S. P. Müller

The observed transitions were taken from
(1) M. Elkeurti, L. H. Coudert, J. Orphal, G. Wlodarczak, C. E. Fellows, S. Toumi, 2008, J. Mol. Spectrosc. 251, 90
15NH2D tunnels between two equivalent positionsas does the main species NH3. The strong c-type transitions occur between the tunneling substates whereas a-type transitions occur within the states. The antisymmetric, J = 0 state, in the catalog with the state number 1, is higher than the symmetric, J = 0 state by 0.3832 cm–1 or 11487.4 MHz. The rotational constants are average values.
In addition, one has to distinguish between ortho and para levels with a spin-statistical weight ratio of 3 : 1. In the symmetric substate, the ortho and para levels are described by Ka odd and even, respectively, while it is reversed for the antisymmetric substate. The 111 level is the lowest ortho and para level within the symmetric and antisymmetric substate, respectively. It is 14.3388 and 14.7197 cm–1 above the symmetric J = 0 level, respectively. Note, however: The ortho/para energy difference is only 0.3832 cm–1 because of the different symmetries of v = 0 and 1 !
Transition frequencies obtained by FT-FIR spectroscopy have not been merged. They ensure, however, that predictions with calculated uncertainties below 2 MHz should be reliable.
The dipole moment was assumed to agree with that of 14NH2D; see e018501.cat. This assumption is probably correct within the reported uncertainties.

Lines Listed2916
Frequency / GHz< 9614
Max. J21
log STR0-8.0
log STR1-6.7
Isotope Corr.-6.378
Egy / cm–10.0 / 0.3832
 µa / D–0.18
 µb / D 
 µc / D1.463
 A / MHz289208.
 B / MHz191502.6
 C / MHz140667.
detected in ISM/CSMyes

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