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Table B.1

Classified transitions originating from the 4f3(5d, 7s, 6d, and 5f) configurations of Nd III observed in the Nd-Ar PDL FT and Nd VS spectra (extract).

Spec S/N FWHM Int. ɡuA log(ɡlƒ) λobs σobs σRitz σobsσRitz λRitzair$\lambda _{{\rm{Ritz}}}^{{\rm{air}}}$ Lower Level Upper Level El Eu Note
(cm−1) (arb.) (s−1) (Å) (cm−1) (cm−1) (cm−1) (A) Label Label (cm−1) (cm−1)
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) (16)
g 1 3.l×109 −0.34 993.794(6) 100 624.4(6) 100624.528(300) −0.128 993.793(3) 4f3(4I°)5d 57 4f3(4I°)5f 5I6 18 656.272 119 280.8
g 1 2.2×109 −0.49 994.019(6) 100 601.7(6) 100601.732(300) −0.032 994.019(3) 4f3(4I°)5d 56 4f3(4I°)5f 5I5 16 938.068 117 539.8
g 0 l.8×109 −0.57 994.138(6) 100 589.7(6) 100589.863(300) −0.163 994.136(3) 4f3(4I°)5d 55 4f3(4I°)5f 5I4 15 262.437 115 852.3
g 3 2.4×109 −0.45 997.327(6) 100 268.0(6) 100268.628(300) −0.628 997.321(3) 4f3(4I°)5d 57 4f3(4I°)5f 3L8 18 656.272 118 924.9
g 30 6.4×109 0.05 1084.030(6) 92 248.4(5) 92248.215(300) 0.185 1084.032(4) 4f3(4I°)5d 38 4f3(4I°)5f 3L8 26 676.685 118 924.9
g 40 2.2×1010 0.59 1084.129(6) 92 239.9(5) 92239.935(400) −0.035 1084.129(5) 4f3(4I°)5d 37 4f3(4I°)5f 3M8 24 497.165 116 737.1
g 2 3.9×109 −0.16 1085.156(6) 92 152.6(5) 92 152.735(300) −0.135 1085.155(4) 4f3(4I°)5d 37 4f3(4I°)5f 3L7 24 497.165 116 649.9
g 8 6.3 ×109 0.06 1107.003(6) 90 334.0(5) 90334.035(300) −0.035 1107.002(4) 4f3(4I°)5d 37 4f3(4I°)5f 5M8 24 497.165 114 831.2

g 19 3.1×107 −1.66 2164.085(6) 46 208.92(13) 46 209.035(13) −0.118 2163.3997(6) 4f3(4I°)6p 5K6 4f3(4I°)6d 37 62 520.646 108 729.681
f 4 0.210 22 4.4×109 0.53 2254.5500(17) 44 354.749(33) 44354.728(9) 0.021 2253.8528(5) 4f3(4I°)6p 5I8 4f3(4I°)6d 3L°9 66 792.024 111 146.752
f 6 0.144 24 з.з×109 0.40 2260.6456(9) 44235.151(17) 44 235.150(10) 0.001 2259.9461(5) 4f3(4I°)6p 5K7 4f3(4I°)6d 38 64 622.006 108 857.156
g 21 3.7×108 −0.55 2263.457(6) 44 180.21(12) 44180.061(12) 0.150 2262.7643(6) 4f3(4I°)6p 5I6 4f3(4I°)6d 37 64 549.620 108 729.681
f 7 0.239 24 l.4×109 0.15 2599.5239(13) 38 468.583(19) 38 468.575(11) 0.008 2598.7476(7) 4f3(4I°)6p 3K8 4f3(4I°)7s(152,12)°8${4{{\rm{f}}^3}\left( {^4{\rm{I}}^\circ } \right)7{\rm{s}}\left( {{{15} \over 2},{1 \over 2}} \right){^\circ _8}}$ 70 599.570 109 068.145
f 6 0.283 26 7.9×108 −0.10 2603.2166(16) 38 414.015(24) 38 414.008(11) 0.007 2602.4394(7) 4f3(4I°)6p 5H7 4f3(4I°)7s(112,12)°6${4{{\rm{f}}^3}^4\left( {^{\rm{4}}{\rm{I}}^\circ } \right)7{\rm{s}}\left( {{{11} \over 2},{1 \over 2}} \right){^\circ _6}}$ 66 717.513 105 131.521
f 18 0.214 62 2.2×109 0.35 2610.1592(5) 38 311.840(7) 38 311.836(6) 0.004 2609.3801(4) 4f3(4I°)6p 5H6 4f3(4I°)7s(92,12)°5$4{{\rm{f}}^3}\left( {^4{\rm{I}}^\circ } \right)7{\rm{s}}\left( {{9 \over 2},{1 \over 2}} \right){^\circ _5}$ 65 023.633 103 335.469
f 2 0.170 6 6.9×107 −1.13 2679.0382(37) 37 326.829(52) 37 326.835(12) −0.006 2678.2420(9) 4f3(4I°)6p 3K8 4f3(4I°)6d 58 70 599.570 107 926.405

Notes. The full electronic version of this table is available at Zenodo. The top half of this extract shows observed 4f35d−4f35ſ transitions in the grating spectra, the bottom half shows 4f36p − 4f3(7s + 6d) transitions observed in both the grating and FT spectra. The columns are: (1) spectrum of observation, where ‘g’ indicates line observed only in the grating Nd VS spectra and ‘f’ indicates line observed in both the Nd-Ar PDL FT and Nd VS spectra, where only the higher accuracy FT spectral lines are presented, (2)–(3) signal-to-noise ratio and full width at half maximum of the fitted FT spectral line, (4) approximate relative intensity corresponding to relative photon flux for ‘f’ and to relative energy flux for ‘g’, where lines above 2000 Å are on the same scale as those in Tables 6 and 7 of Ding et al. (2024) and lines below 2000 Å scale between 0 and 100. (5)–(6) weighted TP and log of the weighted (absorption) oscillator strength calculated using the Cowan code, where ɡu and ɡl refer to statistical weights of the upper and lower energy levels, respectively, (7)–(8) observed vacuum wavelength for ‘g’ and vacuum wavenumber for ‘f’, (9) Ritz wavenumber from level optimisation, (10) wavenumber difference between observed and Ritz values, (11) Ritz air wavelength for lines above 2000 Å converted using the three-term dispersion formula from Peck & Reeder (1972), Ritz vacuum wavelengths are given for lines below 2000 Å, (12)–(13) energy levels associated with the transition, their energies are in columns (14)–(15), respectively, and (16) contains comments of the observed transition, where ‘B/W’ indicates a blended or weak line with unreliable wavenumber and intensity, which was omitted from level optimisation. Uncertainties of columns (7), (8), and (9) are in parentheses in units of the final decimal place.

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