The spectrum of Nb xiii was observed with a low-inductance spark and a laser-produced plasma in the region from 70–630 Å on the 10.7-m grazing incidence spectrograph at NBS. From the identification of 38 lines, a system of 29 energy levels was determined. The level system (Cu i isoelectronic sequence, 3d10nl) includes the series ns(n = 4–6), np(n = 4–7), nd(n = 4–6), nf(n = 4–7), and ng(n = 5–8). The observed energy levels are compared with Hartree-Fock calculations. The ionization energy is determined from the nf and ng series to be 2 166 300 ± 300 cm −1 (268.59 ± 0.04 eV).
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Observed by Alexander et al., Ref. 1, but not in present work; wavelength as calculated from present level values, intensity roughly estimated so as to be on present scale.
TABLE II
Energy levels of Nb xiii.
Term
J
E(cm−1)
Unc. (cm−1)
n*
Fine-structure interval (cm−1)
4s2S
1/2
0
4
2.9259
4p2P
1/2
220 624
4
3.0873
26 720 ± 4
3/2
247 344
4
3.1088
4d2D
3/2
603 241
7
3.4445
4 368 ± 6
5/2
607 609
6
3.4494
4f2F
5/2
954 813
14
3.9125
50 ± 6
7/2
954 863
9
3.9126
5s2S
1/2
976 219
20
3.9476
5p2P
1/2
1 070 821
13
4.1145
11 080 ± 8
3/2
1 081 901
10
4.1355
5d2D
3/2
1 236 367
36
4.4657
1 960 ± 20
5/2
1 238 327
49
4.4705
5f2F
5/2
1 390 481
32
4.8892
78 ± 20
7/2
1 390 559
31
4.8895
6s2S
1/2
1 410 966
49
4.9551
5g2G
7/2,9/2
1 421 512
18
4.9900
6p2P
1/2
1 460 044
37
5.1243
5 723 ± 20
3/2
1 465 767
27
5.1452
6d2D
3/2
1 546 989
88
5.4722
1 051 ± 50
5/2
1 548 040
85
5.4769
6f2F
5/2
1 629 535
53
5.8780
57 ± 30
7/2
1 629 592
53
5.8783
6g2G
7/2,9/2
1 648 660
42
5.9856
7p2P
1/2
1 672 508
58
6.1284
3 237 ± 34
3/2
1 675 745
57
6.1486
7f2F
5/2
1 773 543
69
6.872
28 ±40
7/2
1 773 571
66
6.872
7g2G
7/2,9/2
1 785 779
51
6.981
8g2G
7/2,9/2
1 874 915
59
7.978
Limit
2 166 300
TABLE III
Observed and calculated nf2F fine-structure intervals in Nb xiii. Values are in cm−1.
Observed by Alexander et al., Ref. 1, but not in present work; wavelength as calculated from present level values, intensity roughly estimated so as to be on present scale.
TABLE II
Energy levels of Nb xiii.
Term
J
E(cm−1)
Unc. (cm−1)
n*
Fine-structure interval (cm−1)
4s2S
1/2
0
4
2.9259
4p2P
1/2
220 624
4
3.0873
26 720 ± 4
3/2
247 344
4
3.1088
4d2D
3/2
603 241
7
3.4445
4 368 ± 6
5/2
607 609
6
3.4494
4f2F
5/2
954 813
14
3.9125
50 ± 6
7/2
954 863
9
3.9126
5s2S
1/2
976 219
20
3.9476
5p2P
1/2
1 070 821
13
4.1145
11 080 ± 8
3/2
1 081 901
10
4.1355
5d2D
3/2
1 236 367
36
4.4657
1 960 ± 20
5/2
1 238 327
49
4.4705
5f2F
5/2
1 390 481
32
4.8892
78 ± 20
7/2
1 390 559
31
4.8895
6s2S
1/2
1 410 966
49
4.9551
5g2G
7/2,9/2
1 421 512
18
4.9900
6p2P
1/2
1 460 044
37
5.1243
5 723 ± 20
3/2
1 465 767
27
5.1452
6d2D
3/2
1 546 989
88
5.4722
1 051 ± 50
5/2
1 548 040
85
5.4769
6f2F
5/2
1 629 535
53
5.8780
57 ± 30
7/2
1 629 592
53
5.8783
6g2G
7/2,9/2
1 648 660
42
5.9856
7p2P
1/2
1 672 508
58
6.1284
3 237 ± 34
3/2
1 675 745
57
6.1486
7f2F
5/2
1 773 543
69
6.872
28 ±40
7/2
1 773 571
66
6.872
7g2G
7/2,9/2
1 785 779
51
6.981
8g2G
7/2,9/2
1 874 915
59
7.978
Limit
2 166 300
TABLE III
Observed and calculated nf2F fine-structure intervals in Nb xiii. Values are in cm−1.