The combined fit of several isotopic species and the first excited state of the main isotopolog was described by
(1) H. S. P. Müller, K. Kobayashi, K. Takahashi, K. Tomaru, and F. Matsushima, 2015, J. Mol. Spectrosc. 310, 92.
Hund's case b quantum numbers were employed as usual. Data were used with reported uncertainties for the most part, some were adjusted. Multiple rotational data were only retained in case of similar uncertainties, usually only the ones with smaller uncertainties were used. Some data with residuals much larger than the uncertainties were omitted. Millimeter and lower submillimeter data of the main isotopolog were taken from
(2) H. M. Pickett, E. A. Cohen, J. W. Waters, and T. G. Phillips, Contribution Π13 at the 34th Symposium on Molecular Spectroscopy, Columbus, OH, USA (1979); communicated to H.S.P.M. September 1997.
Submillimeter and terahertz data were taken from
(3) T. D. Varberg, F. Stroh, and K. M. Evenson, 1988, J. Mol. Spectrosc. 130, 466.
Λ-doubling transitions in v = 0 were mainly taken from
(4) W. L. Meerts and A. Dymanus, 1972, J. Mol. Spectrosc. 44, 320.
Additional v = 0 Λ-doubling transitions were taken from
(5) R. M. Neumann, 1970, Astrophys. J. 161, 779;
and from
(6) W. L. Meerts, 1976, Chem. Phys. 14, 421.
Further v = 0 as well as v = 1 Λ-doubling transitions were reported by
(7) R. M. Dale, J. W. C. Johns, A. R. W. McKellar, and M. Riggin, 1977, J. Mol. Spectrosc. 67, 440;
and by
(8) R. S. Lowe, A. R. W. McKellar, P. Veillette, and W. L. Meerts, 1981, J. Mol. Spectrosc. 88, 372.
Millimeter and lower submillimeter data of ¹⁵NO were taken from
(9) A. H. Saleck, K. M. T. Yamada, and G. Winnewisser, 1991, Mol. Phys. 72, 1135.
Submillimeter and terahertz data were taken from (3), Λ-doubling transitions from (4).
Millimeter and lower submillimeter data of N¹⁸O were taken from (9), terahertz data from (1).
Millimeter data of N¹⁷O and ¹⁵N¹⁸O were published by
(10) A. H. Saleck, M. Liedtke, A. Dolgner, and G. Winnewisser, 1994, Z. Naturforsch. 49a, 1111.
NO heterodyne IR transition frequencies were reported by
(11) A. Hinz, J. S. Wells, and A. G. Maki, 1986, J. Mol. Spectrosc. 119, 120;
and by
(12) S. Saupe, B. Meyer, M. H. Wappelhorst, W. Urban, and A. G. Maki, 1996, J. Mol. Spectrosc. 179, 13.
Contributions of v = 1 to the partition function are essentially negligible at 300 K.
The electric dipole moment was evaluated from the ground state value of NO in (5) and from μ₁ – μ₀ reported in
(13) Y. Liu, Y. Guo, J. Lin, G. Huang, C. Duan, and F. Li, 2001, Mol. Phys. 99, 1457.
The magnetic dipole moment was estimated from γ in (1).
Concerning Hund's case a quantum numbers, levels with J + 0.5 = N correlate with ²Π_1/2 and levels with J – 0.5 = N correlate with ²Π_3/2 for J ≤ 5.5; the correlation is reversed for J ≥ 6.5.