J/ApJS/207/13 The spectrum and term analysis of V II (Thorne+, 2013) ================================================================================ The spectrum and term analysis of V II. Thorne A.P., Pickering J.C., Semeniuk J.I. =2013ApJS..207...13T ================================================================================ ADC_Keywords: Atomic physics ; Line Profiles Keywords: atomic data - line: formation - line: profiles Abstract: The spectrum and extended term analysis of V II are presented. Fourier transform spectrometry was used to record high resolution spectra of singly ionized vanadium in the region 1492-5800 {AA} (67020-17260/cm) with vanadium-neon and vanadium-argon hollow cathode lamps as sources. The wavenumber uncertainty for the center of gravity of the strongest lines is typically 0.002/cm, an improvement of an order of magnitude over previous measurements. Most of the lines exhibit partly resolved hyperfine structure. The V II energy levels in the 1985 compilation of Sugar and Corliss have been confirmed and revised, with the exception of the high-lying 4f levels and eight of the lower levels. Thirty-nine of the additional eighty-five high levels published by Iglesias et al. (1988, Publicaciones del Instituto Optica Daza de Valdes Madrid, 47, 1) have also been confirmed and revised, and three of their missing levels have been found. The energy uncertainty of the revised levels has been reduced by about an order of magnitude. In total, 176 even levels and 233 odd levels are presented. Description: The laboratory spectra used in this analysis were recorded with the f/25 vacuum UV Fourier transform (FT) spectrometer at Imperial College over the region 16000-67000cm^-1^ (6320-1500{AA}). The infrared spectra recorded for us with the FT spectrometer at the National Solar Observatory (NSO), Kitt Peak, Tucson, Arizona (Brault 1976JOSA...66.1081B), and used in the V I analysis as described in our previous paper (Thorne et al. 2011ApJS..192...11T), were included in the initial fitting, but almost all of the lines corresponding to possible V II transitions were doubly identified with strong V I transitions and therefore contributed very little to the V II analysis. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1.dat 100 1244 V.II (23.01) linelist of observed transitions table2.dat 104 175 V.II (23.01) even energy levels table3.dat 104 232 V.II (23.01) odd energy levels -------------------------------------------------------------------------------- See also: J/ApJS/207/20 : Parity-forbidden [Co II] and [V II] lines (Ruffoni+, 2013) Byte-by-byte Description of file: table1.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 5 F5.2 [-] Int Intensity in arbitrary (decimal) log units 7- 9 I3 --- W Width; guide to the line pattern width; 0.001/cm 11- 14 I4 --- SNR Observed signal-to-noise ratio 16- 24 F9.4 0.1nm lambda Wavelength; Angstroms (1) 26- 34 F9.3 cm-1 sigma Center-of-gravity vacuum transition wavenumber 36- 40 F5.3 cm-1 O-C Difference between observed and calculated wavenumbers 42- 55 A14 --- Conf0 Lower level configuration 57- 65 A9 --- Term0 Term and J value of the lower level 67- 87 A21 --- Conf1 Upper level configuration 89- 97 A9 --- Term1 Term and J value of the upper level 99-100 A2 --- Bl Blend and doubly-identified line flag (2) -------------------------------------------------------------------------------- Note (1): In air for {lambda}>2000Angstroms (0.2um) and in vacuum below 2000 Angstroms. Note (2): Flag as follows: D = a line doubly identified with another V II line; D1 = a line doubly identified with a V I line; B = blended with another nearby line; U = blended with an unknown feature. -------------------------------------------------------------------------------- Byte-by-byte Description of file: table[23].dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 23 A23 --- Conf Assigned configuration 25- 32 A8 --- Term Term 34 I1 --- J [0/8] J value 36- 40 A5 --- Flag Level flag (1) 42- 50 F9.3 cm-1 E Energy 52- 55 F4.3 cm-1 e_E ? Uncertainty in E 57- 58 I2 --- NL [1/28]? Number of lines used (2) 60- 62 I3 % Eig1% ? Percentage contribution of leading eigenvector 64- 80 A17 --- Eig2 Second most significant eigenvector 82- 83 I2 % Eig2% ? Percentage contribution of secondary eigenvector 85-101 A17 --- Eig3 Third most significant eigenvector 103-104 I2 % Eig3% ? Percentage contribution of tertiary eigenvector -------------------------------------------------------------------------------- Note (1): Flag as follows: new = a new level; new* = the ICL (Iglesias et al. 1988, Publicaciones del Instituto Optica Daza de Valdes Madrid, 47, 1) energy is discarded and replaced with a newly found level energy; SC = the energy level was reported by "SC" (Sugar, J. & Corliss, C. 1985, JPCRD, 14, 215) but is unconfirmed in this work. ICL = the energy level was reported by "ICL" (Iglesias et al. 1988, Publicaciones del Instituto Optica Daza de Valdes Madrid, 47, 1) but is unconfirmed in this work. Where level energies were reported in both "SC" and "ICL" but unconfirmed in this work the "ICL" values are given. Note (2): To determine the energy level value in the energy level least squares fitting is indicated. -------------------------------------------------------------------------------- History: From electronic version of the journal ================================================================================ (End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 09-Aug-2013