PO, v = 1, 2
Phosphorus monoxide, 2Πr, v = 1, 2
Species tag 047519
Version2*
Date of EntryOct. 2019
ContributorH. S. P. Müller

Whereas the first entry from Apr. 2008 was limited to the ground vibrational state, the present one takes into account data associated with higher vibrational states as well. Note that this entry contains v = 1 and 2 data; two additional entries contain v = 0 (047507) and v = 3 – 5 (047520) data. The majority of the rotational data were taken from
(1) S. Bailleux, M. Bogey, C. Demuynck, Y. Liu, and A. Walters; 2002, J. Mol. Spectrosc. 216, 465.

Additional v = 0 data were provided by
(2) K. Kawaguchi, S. Saito, and E. Hirota; 1983, J. Chem. Phys. 79, 629.

Two v = 3 transition frequencies from (1) with large residuals were omitted. Also included were v = 1 – 0 data from
(3) J. E. Butler, K. Kawaguchi, and E. Hirota; 1983, J. Mol. Spectrosc. 101, 161;

and from
(4) H. B. Qian; 1995, J. Mol. Spectrosc. 174, 599.

Two vibrational correction terms, the ground state spin-orbit parameter and its second vibrational correction were taken from
(5) R. D. Verma and S. R. Singhal; 1975, Can. J. Phys. 53, 411.

The set of spectroscopic parameters differs considerably from that in (1). Data with experimental uncertainties of 1 MHz were not merged. The predictions should be reliable up to 1 THz and still reasonable at higher frequencies.
Concerning Hund's case a quantum numbers, levels with J + 0.5 = N correlate with 2Π1/2 and levels with J – 0.5 = N correlate with 2Π3/2 for J ≤ 11.5; the correlation is reversed for J ≥ 12.5.
The ground state dipole moment was determined by
(6) H. Kanata, S. Yamamoto, and S. Saito, 1988, J. Mol. Spectrosc. 131, 89
.

Lines Listed920
Frequency / GHz< 2000
Max. J47
log STR0-10.0
log STR1-10.0
Isotope Corr.-0.0
Egy / cm–11220.16, 1220.17
 µa / D1.88
 µb / D 
 µc / D 
 A / MHz 
 B / MHz21735.643, 21571.688
 C / MHz 
 Q(3000.)50158.2016
 Q(2500.)36205.5006
 Q(2000.)24516.2497
 Q(1500.)15120.2892
 Q(1000.)7986.4704
 Q(500.0)3004.2423
 Q(300.0)1544.3662
 Q(225.0)1068.0933
 Q(150.0)643.0813
 Q(75.00)293.6315
 Q(37.50)146.5057
 Q(18.75)74.8963
 Q(9.375)39.1587
 Q(5.000)22.5718
 Q(2.725)14.1109
detected in ISM/CSMno


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