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J/ApJS/211/4        Thorium spectrum from 250nm to 5500nm        (Redman+, 2014)

The spectrum of thorium from 250 nm to 5500 nm: Ritz wavelengths and optimized energy levels. Redman S.L., Nave G., Sansonetti C.J. <Astrophys. J. Suppl. Ser., 211, 4 (2014)> =2014ApJS..211....4R
ADC_Keywords: Atomic physics ; Spectroscopy Keywords: atomic data; line: identification; methods: data analysis; standards; techniques: radial velocities Abstract: We have made precise observations of a thorium-argon hollow cathode lamp emission spectrum in the region between 350nm and 1175nm using a high-resolution Fourier transform spectrometer. Our measurements are combined with results from seven previously published thorium line lists to re-optimize the energy levels of neutral, singly, and doubly ionized thorium (Th I, Th II, and Th III). Using the optimized level values, we calculate accurate Ritz wavelengths for 19874 thorium lines between 250nm and 5500nm (40000/cm to 1800/cm). We have also found 102 new thorium energy levels. A systematic analysis of previous measurements in light of our new results allows us to identify and propose corrections for systematic errors in Palmer & Engleman (1983ats..book.....P) and typographical errors and incorrect classifications in Kerber et al. (2008ApJS..178..374K). We also found a large scatter with respect to the thorium line list of Lovis & Pepe (Cat. J/A+A/468/1115). We anticipate that our Ritz wavelengths will lead to improved measurement accuracy for current and future spectrographs that make use of thorium-argon or thorium-neon lamps as calibration standards. Description: We observed the spectrum of a commercial sealed Th/Ar HCL running at 25mA for almost 15hr starting on 2011 November 2. The region of observation was limited to between 8500/cm and 28000/cm (360nm and 1200nm) by the sensitivity of the silicon photodiode detector. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 94 3800 Our new thorium measurements table4.dat 44 102 New Thorium energy levels table5.dat 74 69 Newly identified neon lines from Palmer & Engleman (1983ats..book.....P) table6.dat 115 20104 Thorium line list table7.dat 63 1368 Optimized thorium energy levels
See also: J/A+A/468/1115 : Thorium and argon lines in the visible (Lovis+, 2007) J/AJ/141/62 : M5 chemical abundances for evolved stars (Lai+, 2011) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 11 F11.5 cm-1 sigma [8530.4/26995.8] Wavenumber σ 13- 19 F7.5 cm-1 e_sigma Uncertainty in sigma 21- 31 F11.6 nm lambda [370.4/1172.3] Vacuum wavelength λ 33- 40 F8.6 nm e_lambda Uncertainty in Vsigma 42- 44 I3 10-3cm-1 Width [13/154] Line width 46- 47 I2 --- SN [2/99] Measure signal-to-noise 49- 53 A5 --- Ion Species identifier 56- 60 I5 cm-1 E1 ? Odd level energy 62- 69 A8 --- J1 Odd J level designation 71- 75 I5 cm-1 E0 ? Even level energy 77- 83 A7 --- J0 Even J level designation 85- 92 F8.5 cm-1 Diff ? Difference between this study and Ritz wavenumbers Δσ 94 A1 --- Note Additional note (1)
Note (1): An "A" in the last column indicates a measured line that matches more than one classification.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 2 A2 --- --- [Th] Thorium 4- 5 A2 --- Ion [I II] Ion stage (I=neutral) 7 A1 --- P [eo] Parity, even or odd 10- 19 F10.4 cm-1 E Energy level 22- 27 F6.4 cm-1 e_E Energy uncertainty 30- 41 A12 --- J List of possible J values 43- 44 I2 --- N Number of lines used to derive the level
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 11 F11.5 cm-1 Psigma [7839.3/36265.7] The Palmer & Engleman (1983ats..book.....P) wavenumber 13- 19 F7.5 cm-1 e_Psigma Uncertainty in Psigma 21- 30 F10.4 cm-1 Osigma [7839.3/36265.7] Observed Neon wavenumber 32- 37 F6.4 cm-1 e_Osigma Uncertainty in Osigma 39- 48 F10.4 cm-1 Rsigma [7902.5/36265.7]? Ritz wavenumber 50- 55 F6.4 cm-1 e_Rsigma ? Uncertainty in Rsigma 57- 66 A10 --- Ref Source(s) (1) 68- 69 A2 --- --- [Ne] Element (Neon) 71- 72 A2 --- Ion [I II] Ionization state (I=neutral or II) 74 A1 --- Note [or] Line matches Observed (o) or Ritz (r) wavenumber (blank is both)
Note (1): Literature values for the NeI lines are taken from the compilation of Saloman & Sansonetti (2004JPCRD..33.1113S), while those of NeII are from Kramida & Nave (2006EPJD...39..331K). Source identifications are: MH2 = Meggers & Humphreys (1934, Bur. Stand. J. Res., 13, 293), BAL = Burns et al. (1950JOSA...40..339B), EHR = Ehrhardt J.C. (1970PhDT........32E), P71 = Persson W. (1971PhyS....3..133P), PE83 = Palmer & Engleman (1983ats..book.....P), SBS04 = Sansonetti et al. (2004), KN06 = Kramida & Nave (2006EPJD...39..331K).
Byte-by-byte Description of file: table6.dat
Bytes Format Units Label Explanations
1- 12 F12.6 cm-1 Rsigma [1846/42625] Ritz wavenumber 14- 21 F8.6 cm-1 e_Rsigma Uncertainty in Rsigma 23- 34 F12.6 nm Rlambda [2346/54147] Ritz vacuum wavelength λ 36- 43 F8.6 nm e_Rlambda Uncertainty in Rlambda 45- 46 A2 --- --- ]Th] Thorium 48- 50 A3 --- Ion [I II III] Ion stage (I=neutral) 52- 56 I5 --- Int [0/53000] Relative intensity 58- 69 A12 --- ID1 Lower energy level tag; energy, J, parity 71- 82 A12 --- ID2 Upper energy level tag; energy, J, parity 84- 94 F11.5 cm-1 sigma [1846/42625] Measured wavenumber σ 95 A1 --- --- [0] 97-103 F7.5 cm-1 e_sigma [0/0.015] Uncertainty in sigma 104 A1 --- --- [0] 106-111 A6 --- Ref Source (1) 114-115 A2 --- Note Additional note (2)
Note (1): Source as follows: GBCZ74 = Giacchetti et al. (1974, JRNBS, 78A, 247); ZC74 = Zalubas & Corliss (1974, JRNBS, 78A, 163 ); Z76 = Zalubas R. (1976, JRNBS, 80A, 221); PE83 = Palmer & Engleman (1983ats..book.....P); EHW03 = Engleman et al. (2003JQSRT..78....1E); LP07 = Lovis & Pepe (2007, Cat. J/A+A/468/1115); KNS08 = Kerber et al. (2008ApJS..178..374K); RNS13 = This publication. Note (2): The note in the last column means: A = a measured line that matches more than one classification. B? = a line that deviates from the Ritz wavenumber by 5 or more times its measured uncertainty, and therefore was not included in the level optimization.
Byte-by-byte Description of file: table7.dat
Bytes Format Units Label Explanations
1- 2 A2 --- --- [Th] Element (Thorium) 4- 6 A3 --- Ion [I II III] Ion stage (I=neutral) 8 A1 --- P [eo] Parity, even or odd 13- 24 A12 --- ID Energy level tag; energyJparity 26- 37 F12.6 cm-1 E [0/66427.2] Energy 39- 46 F8.6 cm-1 e_E [0/0.018] Uncertainty in E 48- 59 A12 --- J Possible J level(s) 61- 63 I3 --- N [1/198] Number of lines used
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 04-Apr-2014
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