Phosphidogen, X 2B1
Species tag 033501
Date of EntryNov. 2001
ContributorH. S. P. Müller

The experimental lines were taken from
(1) Y. Endo, S. Saito, and E. Hirota, 1983, J. Mol. Spectrosc. 97, 204;
(2) M. Kajita, Y. Endo, and E. Hirota, 1987, J. Mol. Spectrosc. 124, 66
; and from
(3) L Margulés, E. Herbst, V. Ahrens, F. Lewen, G. Winnewisser, and H. S. P. Müller, 2002, J. Mol. Spectrosc. 211, 211.
The dipole moment is an estimate from several ab initio calculations by
(4) H. L. Woodcock, S. S. Wesolowski, Y. Yamaguchi, and H. F. Schaefer, III, 2001, J. Phys. Chem. A 105, 5037.
At low temperatures, it may be necessary to discern between ortho-PH2 and para-PH2. The ortho states are described by Ka + Kc even, the para states by Ka + Kc odd. There are three times as many levels for ortho-PH2 than there are for para-PH2. Thus, for transitions with unresolved 1H hyperfine splitting the nuclear spin-weight ratio is 3 : 1 between ortho-PH2 and para-PH2. However, for transitions with resolved 1H hyperfine splitting no non-trivial spin-statistics have to be considered. The NKaKc = 101; n, F = 5, 1 (or J, F1 = 1.5, 1.0) is the lowest para state. It is 12.2771 cm–1 above ground.
The fourth quantum number is an aggregate spin-number it can be decoded with the information provided in the lower part of the ph2.out file or in the upper part of the file.

Lines Listed6814
Frequency / GHz< 8221
Max. J20
log STR0-8.5
log STR1-6.5
Isotope Corr.0.0
Egy / cm-10.0
 µa / D 
 µb / D0.6
 µc / D 
 A / MHz273783.51
 B / MHz242347.64
 C / MHz126343.83
detected in ISM/CSMno

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