Joseph Reader, Nicolo Acquista, and Victor Kaufman, "Spectrum and energy levels of seven-times-ionized krypton (Kr viii) and resonance lines of eight-times-ionized krypton (Kr ix)," J. Opt. Soc. Am. B 8, 538-547 (1991)
The spectrum of the copperlike ion Kr viii was observed with a low-inductance spark and 10.7-m normal- and grazing-incidence spectrographs. A total of 46 new lines with wavelengths ranging from 115 to 696 Å were identified: 18 of the type 3d10nl–3d10nl′, 10 of the type 3d104s–3d94s4p, and 18 of the type 3d104p–3d94p2. From these lines 37 new energy levels were determined: 14 of the type 3d10nl, 10 belonging to 3d94s4p, and 13 to 3d94p2. New values for all known levels were derived by combining the present results with measurements at longer wavelength by Gallardo et al. [
Appl. Opt. 28,
5088 (
1989)]. The ionization energy was found to be 1014665 ± 25 cm−1 (125.802 ± 0.003 eV). New wavelength measurements were made for the 3d10–3d94p, 4f resonance lines of the nickellike ion Kr ix.
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p, Perturbed by close line.
Originally identified by Livingston et al.4; wavelength and intensity from Gallardo et al.8; intensity not scaled to intensities of present observations.
Identification, wavelength, and intensity from Ref. 8.
Table 2
One-Electron Energy Levels of Kr viii
Term
J
Energy (cm−1)
Uncertainty (cm−1)
n*
Fine-Structure Interval (cm−1)
4s2S
1/2
0.0
2.1
2.63 090
4p2P∘
1/2
143 695.3
2.3
2.83 965
9781 ± 3
3/2
153 476.1
2.3
2.85 573
4d2D
3/2
374 046.5
2.0
3.31 105
1334 ± 4
5/2
375 381.0
2.6
3.31 451
5s2S
1/2
490 090.2
0.8
3.65 900
5p2P∘
1/2
546 683.7
0.9
3.87 393
3764 ± 2
3/2
550 448.0
1.0
3.88 960
4f2F∘
5/2
562 763.8
1.5
3.94 225
−26 ± 6
7/2
562 738.1
1.9
3.94 214
5d2D
3/2
641 075.6
1.5
4.33 579
548 ± 4
5/2
641 623.1
1.8
4.33 897
6s2S
1/2
692 482
17
4.66 890
6p2P∘
1/2
720 565
42
4.88 673
1864 ± 26
3/2
722 429
42
4.90 229
5f2F∘
5/2
724 997.3
2.0
4.92 397
13 ± 5
7/2
725 010.6
2.3
4.92 409
5g2G
7/2
733 086.4
2.4
4.99 420
18 ± 7
9/2
733 104.8
2.4
4.99 436
6d2D
3/2
768 898
31
5.34 569
281 ± 20
5/2
769 179
30
5.34 875
7s2S
1/2
796 490
24
5.6737
7p2P∘
1/2
812 506
53
5.8941
1071 ± 33
3/2
813 577
53
5.9098
6h2H∘
9/2, 11/2
819 482.0
2.9
5.9985
7d2D
3/2
840 501
39
6.3502
185 ± 40
5/2
840 686
38
6.3536
8s2S
1/2
857 086
29
6.6760
8p2P∘
3/2
867 694
60
6.9127
7i2I
11/2, 13/2
871 319.5
2.9
6.9996
Limit
101 4665
25
Table 3
Wavelengths of Selected Lines of Kr viii Calculated from Optimized Level Values
Levels are designated by J value and ordinal number within the J file.
Values in parentheses are calculated from least-squares-fitted parameters.
All states are based on the 3d9 2D parent state.
Levels are designated by J value and ordinal number within the J file.
Values in parentheses are calculated from least-squares-fitted parameters.
All states are based on the 3d9 2D parent state; states of 3d94s4d are noted with asterisks.
Total percentage of 3d94s4d states.
Table 7
Energy Parameters (in cm−1) and Mean Errors Δ of Least-Squares Fits for the 3d94s4p and 3d94p2 + 3d94s4d Configurations of Kr viii
Nonrelativistic value calculated with Cowan code; equal to value from the Froese Fischer code.
Ref. 9.
Fixed at HF ratio to G1(3d4p).
Fixed at HF energy relative to 3d94p2.
Fixed at HF value.
Table 8
Values for the Ionization Energy of Kr viii Determined from Various Seriesa
Series
Method
Limit (cm−1)
4s–8s
Quadratic quantum defect
1 014 651
4p–8p; J = 3/2
Quadratic quantum defect
1 014 770
4d–7d
Quadratic quantum defect
1 014 585
4f–5f
Δn* from Dirac–Fock calculation
1 014 678
4f–7i
Polarization formula
1 014 796
5f–7i
Polarization formula
1 014 665
5g–7i
Polarization formula
1 014 677
Adopted value, 1 014 665 ± 25 cm−1.
Table 9
Wavelengths of the 3d10–3d94p, 4f Resonance Transitions of Kr ix
p, Perturbed by close line.
Originally identified by Livingston et al.4; wavelength and intensity from Gallardo et al.8; intensity not scaled to intensities of present observations.
Identification, wavelength, and intensity from Ref. 8.
Table 2
One-Electron Energy Levels of Kr viii
Term
J
Energy (cm−1)
Uncertainty (cm−1)
n*
Fine-Structure Interval (cm−1)
4s2S
1/2
0.0
2.1
2.63 090
4p2P∘
1/2
143 695.3
2.3
2.83 965
9781 ± 3
3/2
153 476.1
2.3
2.85 573
4d2D
3/2
374 046.5
2.0
3.31 105
1334 ± 4
5/2
375 381.0
2.6
3.31 451
5s2S
1/2
490 090.2
0.8
3.65 900
5p2P∘
1/2
546 683.7
0.9
3.87 393
3764 ± 2
3/2
550 448.0
1.0
3.88 960
4f2F∘
5/2
562 763.8
1.5
3.94 225
−26 ± 6
7/2
562 738.1
1.9
3.94 214
5d2D
3/2
641 075.6
1.5
4.33 579
548 ± 4
5/2
641 623.1
1.8
4.33 897
6s2S
1/2
692 482
17
4.66 890
6p2P∘
1/2
720 565
42
4.88 673
1864 ± 26
3/2
722 429
42
4.90 229
5f2F∘
5/2
724 997.3
2.0
4.92 397
13 ± 5
7/2
725 010.6
2.3
4.92 409
5g2G
7/2
733 086.4
2.4
4.99 420
18 ± 7
9/2
733 104.8
2.4
4.99 436
6d2D
3/2
768 898
31
5.34 569
281 ± 20
5/2
769 179
30
5.34 875
7s2S
1/2
796 490
24
5.6737
7p2P∘
1/2
812 506
53
5.8941
1071 ± 33
3/2
813 577
53
5.9098
6h2H∘
9/2, 11/2
819 482.0
2.9
5.9985
7d2D
3/2
840 501
39
6.3502
185 ± 40
5/2
840 686
38
6.3536
8s2S
1/2
857 086
29
6.6760
8p2P∘
3/2
867 694
60
6.9127
7i2I
11/2, 13/2
871 319.5
2.9
6.9996
Limit
101 4665
25
Table 3
Wavelengths of Selected Lines of Kr viii Calculated from Optimized Level Values
Levels are designated by J value and ordinal number within the J file.
Values in parentheses are calculated from least-squares-fitted parameters.
All states are based on the 3d9 2D parent state.
Levels are designated by J value and ordinal number within the J file.
Values in parentheses are calculated from least-squares-fitted parameters.
All states are based on the 3d9 2D parent state; states of 3d94s4d are noted with asterisks.
Total percentage of 3d94s4d states.
Table 7
Energy Parameters (in cm−1) and Mean Errors Δ of Least-Squares Fits for the 3d94s4p and 3d94p2 + 3d94s4d Configurations of Kr viii
Nonrelativistic value calculated with Cowan code; equal to value from the Froese Fischer code.
Ref. 9.
Fixed at HF ratio to G1(3d4p).
Fixed at HF energy relative to 3d94p2.
Fixed at HF value.
Table 8
Values for the Ionization Energy of Kr viii Determined from Various Seriesa
Series
Method
Limit (cm−1)
4s–8s
Quadratic quantum defect
1 014 651
4p–8p; J = 3/2
Quadratic quantum defect
1 014 770
4d–7d
Quadratic quantum defect
1 014 585
4f–5f
Δn* from Dirac–Fock calculation
1 014 678
4f–7i
Polarization formula
1 014 796
5f–7i
Polarization formula
1 014 665
5g–7i
Polarization formula
1 014 677
Adopted value, 1 014 665 ± 25 cm−1.
Table 9
Wavelengths of the 3d10–3d94p, 4f Resonance Transitions of Kr ix