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J/ApJS/233/16       Spectral data for neutral carbon (C I)       (Haris+, 2017)

Critically evaluated spectral data for neutral carbon (C I). Haris K., Kramida A. <Astrophys. J. Suppl. Ser., 233, 16 (2017)> =2017ApJS..233...16H
ADC_Keywords: Atomic physics Keywords: atomic data ; infrared: general ; line: identification ; methods: data analysis ; techniques: spectroscopic ; ultraviolet: general Abstract: In this critical compilation, all experimental data on the spectrum of neutral carbon known to us were methodically evaluated and supplemented by parametric calculations with Cowan's codes. The sources of experimental data vary from laboratory to astrophysical objects, and employ different instrumentations, from classical grating and Fourier transform spectrometers to precise laser spectroscopy setups and various other modern techniques. This comprehensive evaluation provides accurate atomic data on energy levels and wavelengths (observed and Ritz) with their estimated uncertainties, as well as a uniform description of the observed line intensities. In total, 412 previously known energy levels were optimized with the help of 1221 selected best-observed lines participating in 1365 transitions in the wavelength region 750Å-609.14µm. The list of recommended energy levels is extended by including 21 additional levels found through quantum-defect extrapolations or parametric calculations with Cowan's codes. In addition, 737 possibly observable transitions are predicted. Critically evaluated transition probabilities for 1616 lines are provided, of which 241 are new. With accurate energy levels obtained, combined with additional observed data on high Rydberg states, the ionization limit was determined to be 90820.348(9)cm-1 or 11.2602880(11)eV, in fair agreement with the previously recommended value, but more accurate. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . this file table1.dat 240 2102 Observed and predicted spectral lines of C I table2.dat 148 435 Observed energy levels of C I table9.dat 56 424 Optimized parameters of C I
See also: J/A+A/375/591 : SUMER Spectral Atlas of Solar Disk Features (Curdt+, 2001) J/ApJS/211/4 : Thorium spectrum from 250nm to 5500nm (Redman+, 2014) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 16 A16 --- Int Relative Intensity (1) 18- 30 F13.5 0.1nm WavL [750.6/6091354]? Observed Wavelength (2) 32- 38 F7.5 0.1nm e_WavL [/0.6]? Uncertainty in WavL (2) 40- 44 I5 --- SNR [2/17210]? Signal-to-noise ratio (3) 46- 48 I3 10-3cm-1 FWHM [17/873]? Full-width at Half-Maximum (3) 50- 63 F14.7 cm-1 WavN [16.4/133213]? Observed Wavenumber (4) 65- 74 F10.7 cm-1 e_WavN [/30]? Uncertainty in WavN (4) 76-106 A31 --- LLev Lower Level (5) 108-139 A32 --- ULev Upper Level (5) 141-153 F13.7 cm-1 LE [0/86499] Lower Energy (6) 155-168 F14.7 cm-1 UE [16/133256] Upper Energy (6) 170-183 F14.6 0.1nm CWavL [750.6/6091354] Calculated (Ritz) Wavelength (2) 185-194 F10.6 0.1nm e_CWavL [/100] Uncertainty in CWavL (2) 196-203 A8 s-1 A ? Transition probability; A-value 205-206 A2 --- Acc Accuracy of A-value (7) 208-209 A2 --- Type Type of transition (8) 211-223 A13 --- r_A References for A-value (9) 225-231 A7 --- r_WavL Reference for WavL (10) 233-234 A2 --- Ns ? Number of sources for Int (11) 236-240 A5 --- Comm Comments (12)
Note (1): Averaged relative observed intensities in arbitrary units are given on a uniform scale corresponding to Boltzmann populations in a plasma with an effective excitation temperature of 0.41eV, corresponding to the FT spectrum "85R13" (see Section 5 for possible uncertainties in the given values). The intensity value is followed by the line character encoded as: bl = blended by other lines either specified by an elemental symbol or given by an index in parentheses. The index is explained as follows (unit of values is cm-1): OIV/2 = second order of an O IV line, T = contaminated by a telluric line, 1 = 23418.059, 2 = 20992.2792, 3 = 8254.2325, 4 = 6834.1017, 5 = 5657.1101 D = double line d = diffuse H = very hazy i = identification uncertain m = masked by other lines either marked or specified by an index in parentheses. The index is explained as follows (unit of values is cm-1): 1 = 21899.0959, 2 = 2927.0767, 3 = 2107.4239, 4 = 1350.858, 5 = 1355.422, 6 = 1349.731, 7 = 1347.773, 8 = 1339.013 l = shaded to long wavelength p = perturbed by nearby lines either indicated by spectrum symbol or given by an index in the parenthesis. The index explained as follows (unit of values is cm-1): gh = grating ghost, 1 = 8191.0769, 2 = 8104.4249, 3 = 6764.1865, 4 = 6740.0118, 5 = 5396.8230, 6 = 3889.1307, 7 = 2033.1415, 8 = 2015.0026 q = asymmetric r = Easily reversed Sh= Shoulder w = wide * = intensity is shared by two or more lines : = wavelength not measured (the value given is a rounded Ritz wavelength) ? = the given character is uncertain Note (2): Observed and Ritz wavelengths are in vacuum for WavL<2000Å and WavL>20000Å and in standard air for 2000Å<WavL<20000Å. Conversion between air and vacuum was made with the five-parameter formula from Peck (1972JOSA...62..958P). Assigned uncertainty of given observed wavelength or computed uncertainty of Ritz wavelength determined in the level optimization procedure. Note (3): Signal-to-noise ratio and full-width at half-maximum (in units of 10-3cm-1) for the lines measured in FT spectra. Note (4): Observed wavenumber (in vacuum). Note (5): Level designation from Table 2. Note (6): Level energy value from Table 2. Note (7): Accuracy code of the A-value is given in Table 10 as: -------------------------------------------------------- Symbol Uncertainty in A-Value Uncertainty in log(gf) (%) -------------------------------------------------------- AAA ≤ 0.3 ≤0.0013 AA ≤ 1 ≤0.004 A+ ≤ 2 ≤0.009 A ≤ 3 ≤0.013 B+ ≤ 7 ≤0.03 B ≤10 ≤0.04 C+ ≤18 ≤0.08 C ≤25 ≤0.11 D+ ≤40 ≤0.18 D ≤50 ≤0.24 E >50 >0.24 -------------------------------------------------------- Note (8): Type as follows: Blank = electric-dipole(E1) transition; M1 = magnetic-dipole transition; E2 = electric-quadrupole transition. Note (9): All transition probabilities, except marked as TW ("This work") are those critically evaluated by Wiese+ (, Wiese+ (2007JPCRD..36.1287W), Wiese+ (2007JPCRD..36.1737W) where the original source of data were encoded as follows: F06 = Froese Fischer (2006JPhB...39.2159F); G89a= normalized to a different scale from values reported by Goldbach et al. (1989A&A...221..155G); H93 = Hibbert et al. (1993A&AS...99..179H); H93a = normalized to a different scale from values reported by Hibbert et al. (1993); L89 = Luo & Pradhan (1989JPhB...22.3377L); L89a = calculated from the multiplet value given by Luo & Pradhan (1989) assuming pure LS-coupling; N84 = Nussbaumer & Storey (1984A&A...140..383N); N84a = normalized to a different scale from values reported by Nussbaumer & Storey (1984); T01 = Tachiev & Froese Fischer (2001CaJPh..79..955T); W = A. W. Weiss, private communication, as quoted in Wiese et al. (1996); TW = This work, semiempirical calculations using Cowan's codes (see text) Note (10): Line References as follows: B80 = Bernheim & Kittrell (1980AcSpe..35...51B); C81 = Cantu et al. (1981PhRvA..23.1223C); C98 = Chang & Geller (1998PhyS...58..326C); followed by various solar origin as: #1 = NOAO1, Livingston & Wallace (; #2 = NOAO2, Wallace, Hinkle & Livingston (1993) [; #A = ATMOS Farmer & Norton (; #M = Mark-IV, Toon (1991OptPN...2...19T); C01 = Curdt et al. (2001A&A...375..591C); F76 = Feldman et al. (1976JOSA...66..853F); F91 = Feldman & Doschek (1991ApJS...75..925F); G09 = Garcia-Hernandez et al. (2009ApJ...696.1733G); H58 = Herzberg (1958RSPSA.248..309H); J66 = Johansson, L. 1966, Ark Fys, 31, 201; K63 = Keenan, P. C., & Greenstein, J. L. 1963, The Line Spectrum of R Coronae Borealis, lambda: 3700-8600 Angstrom, Contrib. from the Perkins Observatory, Vol. II, No:13 K66 = Kaufman & Ward (1966JOSA...56.1591K); K98 = Klein et al. (1998ApJ...494L.125K); L95 = Liu et al. (1995MNRAS.273...47L); L05 = Labazan et al. (2005PhRvA..71d0501L); M81 = Mazzoni (1981PhyBC.111..379M); P05 = Parenti, Vial & Lemaire (2005A&A...443..679P); R27 = Ryde (1927RSPSA.117..164R); S47 = Shenstone (1947PhRv...72..411S); S86 = Sandlin et al. (1986ApJS...61..801S); SiC* = Newly observed lines from the SiC FT spectrum TW = Either predicted with a better accuracy than that of Johansson (1966, Ark Fys, 31, 201) in his Table 3 or newly calculated between energy level optimized in this work. W07 = Wallace & Hinkle (2007ApJS..169..159W); followed by the different origin of FT spectrum from the NSO archive as #1 = 840210R0.001, #2 = 810812R0.002, #6 = 880413R0.006, #13 = 850905R0.013. See the text (section 2.1) for more details. An extra '*' denotes either a newly measured line or the previous identification revised in this work See Table 2 for revised energy levels. W63 = Wilkinson & Andrew (1963JOSA...53..710W); W96 = Wallace et al. (1996ApJS..106..165W); Y91 = Yamamoto & Saito (1991ApJ...370L.103Y); Note (11): Number of sources, if more than one, used to obtain an averaged intensity. Note (12): Flag as follows: C = uncertainty of the line is the differences between the fitted wavelength and the line's center of gravity. D = the given uncertainty was doubled, compared to the original value in the quoted source. E = the given uncertainty was tripled, compared to the original value in the quoted source. F = FT measurement. G = grating measurement. P = predicted line. S = single line that solely determines the upper energy level. T = intensity much greater than expected. U = intensity varies by an order of magnitude or more in different observations. V = intensity could not be reduced to the common-scale. W = intensity is much weaker than expected. X = the line was excluded from the level optimization. Y = blending reported in the original quoted work is removed in this work.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 32 A32 --- Config Configuration, Term & J (1) 34- 47 F14.7 cm-1 Eobs [0/133256] Observed energy 49- 57 F9.7 cm-1 eEobs1 [/0.008]? D1 Uncertainty of Eobs (2) 59- 66 F8.5 cm-1 eEobs2 [0/60]? Uncertainty of Eobs (2) 68- 70 I3 % Perc [32/100]? Leading percentage (3) 72- 73 I2 % Perc2 [4/48]? Second leading percentage (3) 75- 99 A25 --- LComp2 Second leading component (3) 101-102 I2 % Perc3 [4/28]? Third leading percentage (3) 104-128 A25 --- LComp3 3rd leading component (3) 130-133 I4 cm-1 Diff [-197/206]? Differences of Eobs & Efit (4) 135-142 A8 --- LS Previous LS designation (1) 144-146 I3 --- NoL [1/141]? Number of lines in LOPT (5) 148 A1 --- Comm Comment (6)
Note (1): The level designations are in either LS or JK (pair) coupling scheme. JK-designation is given for all previously known regular series 2p.nd (n≥7) and≥8, l=s,p) and their old LS-designation with a leading percentage is given in column "LS". Note (2): The quantity given in column eEobs2 is the uncertainty of separation from the "base" level 2p.3p 3P2 at 71385.40992 cm-1 (see text). The quantity in column eEobs1 (D1) approximately corresponds to the minimum uncertainty of separation from other levels (for a strict definition, see Kramida (2011CoPhC.182..419K); if blank, it is the same as eEobs2). To roughly estimate an uncertainty of any energy interval, (except those within the ground term),the values in column eEobs2 should be combined in quadrature (see text in Section 3). Note (3): The first leading percentage refers to the configuration and term given in the first two columns. The 2nd and 3rd percentages refer to the configuration and term subsequent to them. Percentages are blank for levels that were not included in the calculations. Note (4): Differences between Eobs and those calculated in the parametric least-squares fitting (LSF). Blank for unobserved levels or those excluded from the LSF or not included in the calculations. Note (5): Number of observed lines determining the level in the level optimization procedure. Blank for unobserved levels. Note (6): Comment as follows: B = the base level for presentation of uncertainties. E = the energy level is extrapolated from the known quantum defects. L = the level value obtained in the parametric LSF calculation with Cowan's codes (see text). R = the value of Eobs of previously unresolved fine-structure components is resolved in this work. T = the level position is tentative, based on a single line with an uncertain identification (see Table 1).
Byte-by-byte Description of file: table9.dat
Bytes Format Units Label Explanations
1- 10 A10 --- Config Configuration (1) 12- 21 A10 --- Parms Slater parameters (1) 23- 31 F9.2 cm-1 LSF [-542/218429]? Least-squares-fitted value (1) 33- 37 F5.1 --- e_Parms [-10/93]? Uncertainty of Params (2) 39 I1 --- Group [1/7]? Group index (3) 41- 48 F8.1 cm-1 HFR [0/210998]? Hartree-Fock value (1) 50- 54 F5.3 --- Ratio [0.4/1.2]? Ratio of LSF-to-HF (1) 56 A1 --- Comm [FR] Comment (4)
Note (1): Configurations involved in the calculations and their defining Slater parameters with their Hartree-Fock value and/or Least-squares-fitted value or their ratio. Note (2): Uncertainty of each parameter represents their standard deviation. Blank for fixed values. Note (3): Parameters in each numbered group were linked together with their ratio fixed at the HF level. Note (4): Comment as follows: F = The parameters are fixed at given Ratio of HF value. R = All configuration-interaction parameters Rk in both sets of parity are fixed at 75 percentage of HF value.
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 10-Jan-2018
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