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Table 3

Experimental hyperfine structure constants Aexp and Bexp (in MHz) of the levels of even parity of Nb i together with comparative values Aref and Bref, if available.

E (cm-1) Config., Term J λair (nm) Aexp (MHz) Amean (MHz) Bexp (MHz) Bmean (MHz) Aref (MHz) Bref (MHz) Ref.

8410.90 4d 1/2 854.725 1996.7 (2) 1996.7 (1) 0 0 1996(1) 0 (1)
835.003 1995.8 (1.6) 0
9043.14 4d 5/2 847.596 –407.6 (2) –407.59 (3) 41(8) 38 (3) –407.8606 (43) 35.060 (75) (2)
801.766 –407.5 (6) 35 (8)
10 922.74 4d 7/2 852.696 –157.7 (1.2) –159.5 (6) –46.4 (9) –169 (9) (3)
826.231 –159.9 (6) –45 (34)
790.209 –160.4 (2.0) –47  (22)
11 044.08 4d 9/2 834.601 372 (5)  373.1 (4) 372.9 (7) (3)
800.248 372.7 (6)
770.737* 373.8 (8)
11 247.88 4d 11/2 771.680 593.8  (1.2) 593.9 (1) 592 (3) (3)
754.017* 594.0  (0.6)
11 524.65 4d 13/2 788.526 704.9  (2.8) 700 (4) (3)
12 288.25 4d 3/2 800.755 –592.2  (2.8) 35  (24) –592 (2) (1)
12 357.70 4d 9/2 843.981 739.7 (1.0) 10 (50) 740 (2) (1)
12 982.38 4d 7/2 758.320 568.2 (4) 563.9 (2) (3)
13 145.71 4d 9/2 829.365 663.3 (6) 663.1 (4) 55  (30) 69.0  (4) 667 (5) (4)
767.833 662.3 (1.0) 74 (18)
751.977 666 (4)
13 629.15 4d 1/2 803.773 2938 (3)  2938.8  (6) 0 0 2939.1 (8) 0 (5)
773.586 2938.7  (1.8) 0
763.815 2939  (3) 0
751.237* 2945  (9) 0
14 211.30 4d 3/2 821.125 1417.4  (1.6) 15  (24) 1414.5 (2) 31 (4) (5)
14 899.26 4d 5/2 798.005 1016.0 (8) 1017.6 (6) 8  (24) 7  (2)
787.341 1018.9  (6) 4 (32)
786.266 1017.2  (2.0)
775.090 1016.6  (1.0)
758.526 1016.9  (1.6)
15 282.35 4d 7/2 827.769 982 (8) 981.5  (1) –22  (3) 988 (5) (1)
823.682 981.6  (1.0) –24  (18)
754.338 981.2  (1.2)
753.538 981.6  (1.2) –17 (26)
15 439.25 4d 3/2 817.623 481.5 (8) 481.6 (2) 105  (4) 106 (1)
801.087 482 (3) 111 (24)
790.932 482.2  (2.2) 102 (22)
768.660 480  (3) 116 (30)
762.557 481.9  (1.2) 110  (14)
15 460.77 4d 1/2 819.065 –1134.7 (2.0) –1135.8 (1.3) 0 0
802.471 –1140 (4) 0
792.281 –1135 (4) 0
15 467.08 4d 5/2 840.627 833.4 (2.8) 833.4 (5) –143  (36) –120 (5)
810.783 831.8 (1.2) –104  (28)
802.878 833.1  (1.6) –117 (16)
770.308 834.5  (8) –123 (24)
764.179 832.7  (1.2) –124  (56)
16 828.52 4d 9/2 861.445 744.4  (6) 57 (12) 743.6  (1.2) (1)
17 476.22 4d 11/2 786.255* 11 (8) –20 (19)  – (3)
18 332.04 4d 11/2 766.276* 2.9  (6) –94 (44)
19 034.71 4d 7/2 833.743 478.3  (1.4) 477.6 (4)
772.673 475.9  (1.0) 57  (40)
765.904 477.4  (8)
758.561 477.6  (4)
751.759 482.2  (1.6)
19 556.91 4d 9/2 845.672 112.8  (6) 112.7  (1) 17   (12) –12  (25)
789.857 112.3  (1.2) –33 (10)
766.161 112.6  (1.6)
19 568.72 4d 5/2 808.515 322.4  (1.0) 322.4  (2)
788.429 322.6  (1.4)
773.026 319.8  (1.4)
19 931.98 4d 5/2 842.317 531 (11)  529.0 (6)
827.490 528  (14)
811.682 529  (5)
787.741 529.9  (1.8)
785.793 527.5  (2.2)
20 060.84 4d 7/2 839.231 242.5  (2.4) 244.5 (3) 23 (24) 2 (3)
822.609 242.3  (1.2) 13 (22)
803.606 244.6  (2) 1 (4)
778.709 238  (4)
777.208 242.9  (2.2)
772.403 242.1  (1.4) 11 (80)
22 936.90 4d5      4G 7/2 818.103 266 (5)
23 010.58 4d5      4G 9/2 810.526* 94  (10)
23 048.58 4d5      4G 11/2 794.565 82  (4)

Notes. Configurations and terms according to Kröger & Bouzed (2003); the wavelength given in the fifth column specifies the line that was used to determine the Aexp and Bexp values; when a hyperfine structure constant was determined by more than one line, the weighted mean value Amean and Bmean, respectively, are given, calculated by using the error bar of Aexp and Bexp as weight. In columns Amean and Bmean, twice the standard deviation that resulted from the weighted mean value calculation is given as error.

(*)

Hyperfine structure constants of upper level were fixed during the fit.

Reference. (1) Başar et al. (2008); (2) Fraenkel et al. (1988); (3) Er et al. (2011); (4) Kröger (2007); (5) Bouzed et al. (2003).

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