**Fluorine (F) **

### 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**A95** V. I. Azarov, unpublished compilation of F I data (1995).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 2*p*^{4}3*s*,3*p* levels. Lidén [L49] used the seven strong 2*p*^{5} ^{2}P°-2*p*^{4}3*s* resonance lines to obtain the position of the 2*p*^{4}*nl* level system with respect to the 2*p*^{5} ^{2}P° 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 2*p*^{4}*nl* levels. Azarov's values for the 2*p*^{4}*nl* levels are about 0.12 cm^{-1} below Lidén's because Azarov included some weaker lines omitted by Lidén in deriving the 2*p*^{5}-2*p*^{4}*nl* connection. We here adopt Lidén's connection by giving Azarov's 2*p*^{4}*nl* 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 2*p*^{4} ^{3}P_{1}-^{3}P_{0} 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 2*p*^{5} ^{2}P°_{3/2}-^{2}P°_{1/2} hfs transitions given in this reference with the more accurate values for the hfs splittings of the ^{2}P°_{3/2} and ^{2}P°_{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 ^{2}P°_{3/2} and ^{2}P°_{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 2*p*^{4} ^{3}P ground-term levels. His value for the 2*p*^{4} ^{3}P_{1}-^{3}P_{0} 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 2*p*^{4} ^{3}P_{2}-^{3}P_{1} interval as somewhat more accurate than his ^{3}P_{1}-^{3}P_{0} 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).