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Table 2:

Experimental branching fractions (BF), A-values, and gf-values in Nb II. A(B) is written for A $\times $ 10B.

Upper level 		Lower level $\lambda_{\rm air}$ $\sigma$ BF A log (gf) Unc.
  Design. (Å) (cm-1) Calc. Exp. Exp/Calc (s-1)   (% in gf)
4d3(4F)5p 3F $^{\circ }_4$ 4d4 5D3 2514.3531 39 759.692 0.012 0.013 1.089 2.06(6) -1.76 13
  4d4 5D4 2541.4244 39 336.195 0.067 0.069 1.033 1.09(7) -1.02 12
40561.02 cm-1 4d3(4F)5s 5F4 2700.5523 37 018.457 0.026 0.035 1.336 5.47(6) -1.27 12
  4d3(4F)5s 5F5 2745.3118 36 414.981 0.079 0.086 1.087 1.35(7) -0.86 12
  4d4 3F4 3100.7738 32 240.645 0.025 0.025 0.984 3.88(6) -1.30 17
  4d4 3G5 3372.5601 29 642.544 0.055 0.065 1.197 1.02(7) -0.80 8
  4d3(4P)5s 5P3 3421.1646 29 221.428 0.015 0.018 1.158 2.77(6) -1.36 12
  4d3(4F)5s 3F4 3717.0600 26 895.332 0.348 0.368 1.055 5.75(7) 0.03 8
  4d3(4F)5s 3F3 3720.4532 26 870.790 0.080 0.105 1.304 1.64(7) -0.51 8
  4d4 1G4 3879.3421 25 770.263 0.171 0.089 0.523 1.40(7) -0.55 6
  4d3(2G)5s 3G4 4061.9711 24 611.648 0.021 0.027 1.274 4.27(6) -1.02 9
  Residual       0.099        
4d3(4P)5p 3P $^{\circ}_2$ 4d4 3F3 2956.8884 33 809.499 0.061 0.065 1.073 7.89(6) -1.29 21
  4d3(4P)5s 5P2 3237.9954 30 874.306 0.248 0.199 0.802 2.42(7) -0.72 11
41710.14 cm-1 4d4 1D2 3394.9714 29 446.922 0.151 0.153 1.008 1.85(7) -0.80 11
  4d3(4F)5s 3F2 3541.2454 28 230.683 0.099 0.124 1.244 1.50(7) -0.85 11
  4d3(2P)5s 3P1 3691.1738 27 083.944 0.071 0.073 1.040 5.60(6) -1.24 14
  4d3(2P)5s 3P2 3695.8960 27 049.388 0.183 0.193 1.057 2.35(7) -0.62 11
  4d3(2D2)5s 3D1 4367.3789 22 890.623 0.035 0.037 1.041 4.48(6) -1.19 16
  4d3(4P)5s 3P1 4699.5812 21 272.640 0.041 0.046 1.110 5.53(6) -1.04 19
  Residual       0.110        
4d3(4P)5p 3P $^{\circ}_1$ 4d4 5D0 2372.7316 42 132.646 0.024 0.014 0.598 1.93(6) -2.31 22
  4d4 5D1 2381.7200 41 973.662 0.026 0.018 0.690 2.37(6) -2.22 18
42132.65 cm-1 4d4 3P2 2866.8425 34 871.322 0.038 0.015 0.403 2.03(6) -2.13 52
  4d4 3F2 2887.0836 34 626.881 0.042 0.060 1.426 8.00(6) -1.52 21
  4d3(4P)5s 5P1 3175.7747 31 479.219 0.263 0.273 1.038 3.64(7) -0.78 11
  4d3(4P)5s 5P2 3194.2782 31 296.809 0.259 0.281 1.083 3.75(7) -0.77 11
  4d3(2P)5s 3P2 3639.0501 27 471.891 0.132 0.131 0.990 1.75(7) -0.98 12
  4d3(2P)5s 3P0 3641.3782 27 454.328 0.037 0.034 0.936 4.59(6) -1.56 20
  4d3(4P)5s 3P0 4588.9970 21 785.149 0.033 0.028 0.836 3.67(6) -1.46 23
  Residual       0.146        
4d3(4P)5p 3P $^{\circ}_0$ 4d4 5D1 2265.4874 44 126.956 0.025 0.04 1.612 5.66(5) -2.36 28

44285.94 cm-1

 4d4 3P1 2624.3286 38 093.630 0.003 0.10 31.295 1.41(6) -1.84 21
  4d3(4P)5s 5P1 2972.4398 33 632.513 0.246 0.14 0.558 1.96(6) -1.59 47
  4d3(2P)5s 3P1 3370.6053 29 659.741 0.601 0.60 0.997 8.56(6) -0.84 13
  Residual       0.120        
4d3(4P)5p 5D $^{\circ}_0$ 4d3(4P)5s 5P1 3129.6522 31 943.127 0.756 0.756 1.000 1.05(8) -0.814 12
42596.55 cm-1 Residual       0.244        
4d3(4P)5p 5D $^{\circ}_2$ 4d4 5D2 2332.8990 42 851.977 0.029 0.021 0.731 2.86(6) -1.93 21
  4d4 3F2 2793.6766 35 784.573 0.029 0.047 1.649 6.30(6) -1.43 19
43290.34 cm-1 4d3(4P)5s 5P1 3063.1193 32 636.911 0.120 0.132 1.103 1.76(7) -0.91 14
  4d3(4P)5s 5P2 3080.3475 32 454.501 0.309 0.346 1.120 4.62(7) -0.48 10
  4d3(4P)5s 5P3 3128.9145 31 950.748 0.054 0.047 0.855 6.21(6) -1.34 22
  4d4 1D2 3222.0580 31 027.117 0.226 0.178 0.789 2.38(7) -0.73 12
  4d3(2D2)5s 3D1 4085.3468 24 470.818 0.030 0.031 1.034 4.16(6) -1.28 18
  4d3(2P)5s 1P1 4492.9563 22 250.809 0.072 0.066 0.921 8.83(6) -0.87 14
  Residual       0.130        
4d3(2P)5p 1D $^{\circ}_2$ 4d4 5D1 2300.2897 43 459.407 0.019 0.013 0.685 1.93(6) -2.12 15
  4d4 5D2 2315.1745 43 180.030 0.062 0.040 0.639 5.81(6) -1.63 11
43618.39 cm-1 4d4 5D3 2334.8014 42 817.065 0.037 0.030 0.820 4.40(6) -1.75 14
  4d4 3P2 2749.6848 36 357.067 0.044 0.057 1.299 8.37(6) -1.32 12
  4d4 3F3 2798.9044 35 717.747 0.063 0.108 1.704 1.58(7) -1.03 11
  4d3(4P)5s 5P1 3032.6351 32 964.964 0.021 0.054 2.615 7.96(6) -1.26 19
  4d3(4P)5s 5P2 3049.5039 32 782.554 0.038 0.066 1.767 1.30(7) -1.04 13
  4d3(4P)5s 5P3 3097.1160 32 278.801 0.192 0.138 0.719 2.03(7) -0.84 11
  4d4 1D2 3188.3466 31 355.170 0.034 0.023 0.685 3.40(6) -1.59 30
  4d4 3D2 3244.5078 30 812.426 0.047 0.048 1.030 7.02(6) -1.26 15
  4d4 3D1 3277.7583 30 499.863 0.020 0.019 0.918 2.72(6) -1.66 32
  4d3(4F)5s 3F3 3340.3740 29 928.163 0.018 0.021 1.170 3.11(6) -1.59 26
  4d3(2P)5s 3P1 3448.2179 28 992.192 0.083 0.067 0.814 9.86(6) -1.06 14
Upper level Lower level $\lambda_{\rm air}$ $\sigma$ BF A log (gf) Unc.
  Design. (Å) (cm-1) Calc. Exp. Exp/Calc (s-1)   (% in gf)
  4d3(2P)5s 3P2 3452.3409 28 957.636 0.162 0.153 0.946 2.24(7) -0.70 11
  4d3(4P)5s 3P2 4522.1931 22 107.015 0.027 0.028 1.029 4.12(6) -1.20 20
  Residual       0.133        
4d3(2P)5p 3D $^{\circ}_1$ 4d4 3P2 2747.3562 36 387.869 0.102 0.249 2.431 3.40(7) -0.94 10
  4d4 3F2 2765.9299 36 143.428 0.186 0.076 0.409 1.04(7) -1.45 12
43649.19 cm-1 4d3(4P)5s 5P1 3029.8088 32 995.766 0.028 0.138 4.942 1.88(7) -1.11 11
  4d3(2P)5s 3P2 3448.6696 28 988.438 0.095 0.073 0.770 1.51(7) -1.09 12
  4d3(2P)5s 3P0 3450.7619 28 970.875 0.301 0.178 0.590 2.36(7) -0.90 10
  4d3(2D2)5s 3D1 4026.3014 24 829.673 0.046 0.049 1.063 4.09(6) -1.53 23
  4d3(2D2)5s 3D2 4114.5320 24 297.245 0.046 0.035 0.752 4.77(6) -1.44 21
  4d3(2P)5s 1P1 4421.6458 22 609.664 0.034 0.041 1.224 5.62(6) -1.31 29
  Residual       0.162        
4d3(4P)5p 5D $^{\circ}_3$ 4d4 5D2 2300.8551 43 448.717 0.015 0.012 0.780 1.98(6) -1.96 21
  4d4 5D3 2320.2400 43 085.752 0.033 0.028 0.834 4.73(6) -1.57 16
43887.08 cm-1 4d4 5D4 2343.2745 42 662.255 0.010 0.012 1.220 2.09(6) -1.92 29
  4d4 3P2 2729.5123 36 625.754 0.014 0.013 0.925 2.20(6) -1.77 24
  4d4 3F4 2810.7918 35 566.705 0.088 0.122 1.384 2.48(7) -0.69 15
  4d3(4P)5s 5P2 3024.7316 33 051.241 0.477 0.401 0.841 6.86(7) -0.18 15
  4d3(4P)5s 5P3 3071.5463 32 547.488 0.262 0.305 1.165 5.23(7) -0.29 15
  4d4 3D3 3242.4077 30 832.382 0.011 0.018 1.656 3.08(6) -1.47 49
  4d3(4P)5s 3P2 4467.8849 22 375.702 0.016 0.015 0.949 2.62(6) -1.26 22
  Residual       0.074        
4d3(4P)5p 5D $^{\circ}_1$ 4d4 5D2 2291.3844 43 628.304 0.023 0.014 0.609 2.18(6) -2.29 26
  4d4 3F2 2734.3521 36 560.900 0.083 0.124 1.487 1.94(7) -1.19 17
44066.67 cm-1 4d3(4P)5s 5P1 2991.9493 33 413.238 0.379 0.276 0.727 4.31(7) -0.76 19
  4d3(2P)5s 3P1 3395.7224 29 440.466 0.131 0.065 0.498 1.02(7) -1.28 22
  4d3(2P)5s 3P2 3399.7112 29 405.910 0.154 0.291 1.894 4.55(7) -0.63 17
  Residual       0.230        
4d3(2P)5p 3D $^{\circ}_2$ 4d4 5D3 2265.6748 44 123.277 0.059 0.072 1.217 1.10(7) -1.37 13
  4d4 3F2 2671.6567 37 418.838 0.028 0.016 0.582 9.32(6) -1.30 14
44924.60 cm-1 4d4 3F3 2700.1527 37 023.959 0.211 0.250 1.187 3.82(7) -0.68 12
  4d3(4P)5s 5P1 2917.0516 34 271.176 0.186 0.225 1.206 3.43(7) -0.66 13
  4d3(4F)5s 3F2 3179.2265 31 445.143 0.021 0.025 1.200 3.86(6) -1.53 65
  4d3(2P)5s 3P1 3299.5510 30 298.404 0.098 0.055 0.563 8.47(6) -1.16 17
  4d3(2P)5s 3P2 3303.3216 30 263.848 0.114 0.093 0.819 1.43(7) -0.93 15
  4d3(2D2)5s 3D2 3909.3197 25 572.655 0.022 0.008 0.361 1.22(6) -1.85 32
  4d3(2P)5s 1P1 4185.5335 23 885.074 0.048 0.042 0.890 6.46(6) -1.07 32
  Residual       0.212        
4d3(4P)5p 5D $^{\circ }_4$ 4d4 5D3 2263.3106 44 169.386 0.014 0.010 0.709 1.85(6) -1.89 20
  4d4 5D4 2285.2235 43 745.889 0.066 0.054 0.813 1.04(7) -1.14 12
44970.71 cm-1 4d3(4P)5s 5P3 2972.5710 33 631.122 0.890 0.907 1.020 1.75(8) 0.32 10
  4d3(4F)5s 3F4 3193.4495 31 305.026 0.008 0.006 0.857 1.24(6) -1.77 52
  Residual       0.023        
4d3(2P)5p 3D $^{\circ}_3$ 4d4 5D4 2242.5800 44 577.650 0.017 0.055 3.162 1.20(7) -1.20 10
  4d4 3F4 2667.1467 37 482.100 0.068 0.157 2.300 3.41(7) -0.59 9
45802.47 cm-1 4d4 3H4 2754.5496 36 292.869 0.123 0.105 0.852 2.27(7) -0.74 11
  4d4 1D2 2980.7132 33 539.252 0.217 0.251 1.158 5.46(7) -0.29 11
  4d4 3D2 3029.7413 32 996.508 0.120 0.087 0.722 1.88(7) -0.74 16
  4d3(4F)5s 3F4 3110.7976 32 136.787 0.029 0.021 0.730 4.62(6) -1.33 28
  4d3(4F)5s 3F3 3113.1748 32 112.245 0.012 0.029 2.370 6.32(6) -1.19 21
  4d3(2G)5s 3G3 3304.7036 30 251.221 0.161 0.067 0.415 1.46(7) -0.78 14
  4d3(2G)5s 3G4 3348.7755 29 853.103 0.074 0.050 0.675 1.08(7) -0.90 14
  4d3(2H)5s 3H4 3528.4778 28 332.703 0.078 0.078 1.002 1.70(7) -0.66 17
  Residual       0.101        
4d3(2H)5p 3H $^{\circ}_6$ 4d4 3H5 2566.0734 38 958.386 0.021 0.013 0.621 3.06(6) -1.41 14
  4d4 3H6 2590.9428 38 584.448 0.358 0.478 1.333 1.14(8) 0.17 11
48770.84 cm-1 4d4 3G5 2641.0561 37 852.364 0.031 0.042 1.362 1.01(7) -0.86 12
  4d3(2G)5s 3G5 3055.5159 32 718.166 0.257 0.095 0.368 2.25(7) -0.39 24
  4d3(2H)5s 3H5 3175.8669 31 478.359 0.246 0.252 1.024 5.99(7) 0.07 17
  4d3(2H)5s 3H6 3189.2788 31 345.949 0.086 0.120 1.393 2.86(7) -0.25 20
  Residual       0.001        


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