References and Notes for Fluorine ( F )

A95 V. I. Azarov, unpublished compilation of F I data (1995). Azarov reoptimized the energy levels using Lidén's [L49] analysis and wavelength data and a few more recent measurements. The Ritz-principle consistency of the levels included here indicates relative uncertainties smaller than 0.010 cm-1 within the system of 2p43s,3p levels. Lidén [L49] used the seven strong 2p5 2P°-2p43s resonance lines to obtain the position of the 2p4nl level system with respect to the 2p5 2P° levels. His estimated uncertainty of 0.003 Å for these wavelengths corresponds to an uncertainty of about 0.33 cm-1 for even the best-determined 2p4nl levels. Azarov's values for the 2p4nl levels are about 0.12 cm-1 below Lidén's because Azarov included some weaker lines omitted by Lidén in deriving the 2p5-2p4nl connection. We here adopt Lidén's connection by giving Azarov's 2p4nl levels a systematic adjustment of 0.120 cm-1, which is practically insignificant relative to the uncertainty involved.
BZE98 J. M. Brown, L. R. Zink, and K. M. Evenson, Phys. Rev. A 57, 2507 (1998). These authors determined the F II 2p4 3P1-3P0 fine-structure interval to be 148.544537(53) cm-1.
FW96 J. R. Fuhr and W. L. Wiese, NIST Atomic Transition Probability Tables, CRC Handbook of Chemistry & Physics, 77th Edition, D. R. Lide, Ed., CRC Press, Inc., Boca Raton, FL (1996).
L49 K. Lidén, Ark. Fys. 1, 229 (1949).
LB82 A. Laguna and H. Beatty, Chem. Phys. Lett. 88, 439 (1982). We combined the wavenumbers of the two strong F I 2p5 2P°3/2-2P°1/2 hfs transitions given in this reference with the more accurate values for the hfs splittings of the 2P°3/2 and 2P°1/2 levels in [RHB61] and [H65] respectively, to obtain a value of 404.1407(20) cm-1 for the separation of the hfs centers of gravity of the 2P°3/2 and 2P°1/2 levels.
M03 D. C. Morton, Astrophys. J. Suppl. Ser. 149, 205 (2003).
P69 H. P. Palenius, Ark. Fys. 39, 15 (1969). Palenius's estimate of the wavelength uncertainty near 600 Å implies an uncertainty of 1 to 2 cm-1 in the excited-configuration level values and the ionization limit with respect to the 2p4 3P ground-term levels. His value for the 2p4 3P1-3P0 fine structure interval differs from the more accurate measurement in Ref. [BZE98] by only 0.36 cm-1. We have adjusted the values for these two levels to display the more accurate interval, assuming Palenius's value for the 2p4 3P2-3P1 interval as somewhat more accurate than his 3P1-3P0 interval. We have not correspondingly reevaluated the upper levels or Palenius's Ritz-principle wavelengths for the resonance lines (wavelength less than 608 Å) because the resulting wavelength changes for any of these lines would be less than 0.001 Å, which is insignificant relative to the uncertainties.
RHB61 H. E. Radford, V. W. Hughes, and V. Beltran-Lopez, Phys. Rev. 123, 153 (1961).
WSG66 W. L. Wiese, M. W. Smith and B. M. Glennon, Natl. Stand. Ref. Data Ser., Natl. Bur. Stand. (U.S.) 4 (1966).