Earl F. Worden, Ralph G. Gutmacher, Ronald W. Lougheed, John G. Conway, and Rolf J. Mehlhorn, "Hyperfine Structure in the 253Es Emission Spectrum. II. Nuclear Spin, Nuclear Magnetic Dipole Moment, and Energy Levels of Es ii*," J. Opt. Soc. Am. 60, 1297-1302 (1970)
Fifty-three emission-spectrum lines of einsteinium have been observed. The interval between the ground level 5I8 and the first excited level 3I7 of Es ii has been found to be 938.66 cm−1. The hyperfine structure confirms that the nuclear spin of 253Es is
. A value of μI = (+5.1±1.3)μN was obtained for the nuclear magnetic dipole moment.
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Key to letters: C =weak components present, E =estimated width, P =peculiar or irregular, and S =sharp.
Intensity scale: 1 = 1, 2 =3, 3 = 10, 4 = 30, 5 = 100, 6 = 300, 7 = 1000, 8 = 3000, and 9 = 10 000.
Table II
Assigned lines of Es ii.
Wavelength (Å)
Wavenumber (cm−1)
Interval (cm−1)
Width (mK)
Σ | width | (mK)
Assignment
2724
36 692.19
938.67
2849
10688
0-36692
2796
35 753.52
−7839
938-36692
3547
28 178.78
938.65
4568
10641
0-28178
3670
27 240.13
−6073
938-28178
3602
27 751.12
938.66
6634
10659
0-27751
3728
26 812.46
−4025
938-27751
Table III
Hyperfine structure and hyperfine constants for the 5I8 and 3I7 levels of the 5f11 7s configuration of Es ii.
5I8
3I7
F
Level (mK)
Interval (mK)
F
Level (mK)
Interval (mK)
4.5
0
3.5
0
654
−290
5.5
654
4.5
− 290
793
−349
6.5
1447
5.5
− 639
904
−418
7.5
2351
6.5
−1057
1030
−500
8.5
3381
7.5
−1557
1140
−558
9.5
4521
8.5
−2115
1254
−658
10.5
5775
9.5
−2773
1368
−737
11.5
7141
10.5
−3510
A = 120 mK
A = −67 mK
B = −29 mK
B = −96 mK
rms deviation of fit 6.4 mK
5.0 mK
Table IV
Values of G3(f,s) for the actinides.
Spectrum
U ii
Pu ii
Cm ii
Bk ii
Cf ii
Es ii
Configuration
f4s
f6s
f8s
f9s
f10s
f11s
No. of levels used
4
13
13
3
2
2
G3 (cm−1)
2583
2445
2430
2147
2267
2235
Table V
Differences between corresponding hfs intervals of two low levels of Es ii derived from two line pairs. The values are obtained by taking appropriate differences of running sums of the intervals in Table I.
Line pair
3547 Å
3602 Å
3670 Å
3728 Å
Interval differences, cm−1
2.095
2.095
3.993
4.001
5.696
5.693
7.227
7.226
8.554
8.550
9.695
9.705
10.641
10.659
Table VI
Values of θ1, θ2, and θ3 for the 5I8 and 3I7 levels of Es ii.
Key to letters: C =weak components present, E =estimated width, P =peculiar or irregular, and S =sharp.
Intensity scale: 1 = 1, 2 =3, 3 = 10, 4 = 30, 5 = 100, 6 = 300, 7 = 1000, 8 = 3000, and 9 = 10 000.
Table II
Assigned lines of Es ii.
Wavelength (Å)
Wavenumber (cm−1)
Interval (cm−1)
Width (mK)
Σ | width | (mK)
Assignment
2724
36 692.19
938.67
2849
10688
0-36692
2796
35 753.52
−7839
938-36692
3547
28 178.78
938.65
4568
10641
0-28178
3670
27 240.13
−6073
938-28178
3602
27 751.12
938.66
6634
10659
0-27751
3728
26 812.46
−4025
938-27751
Table III
Hyperfine structure and hyperfine constants for the 5I8 and 3I7 levels of the 5f11 7s configuration of Es ii.
5I8
3I7
F
Level (mK)
Interval (mK)
F
Level (mK)
Interval (mK)
4.5
0
3.5
0
654
−290
5.5
654
4.5
− 290
793
−349
6.5
1447
5.5
− 639
904
−418
7.5
2351
6.5
−1057
1030
−500
8.5
3381
7.5
−1557
1140
−558
9.5
4521
8.5
−2115
1254
−658
10.5
5775
9.5
−2773
1368
−737
11.5
7141
10.5
−3510
A = 120 mK
A = −67 mK
B = −29 mK
B = −96 mK
rms deviation of fit 6.4 mK
5.0 mK
Table IV
Values of G3(f,s) for the actinides.
Spectrum
U ii
Pu ii
Cm ii
Bk ii
Cf ii
Es ii
Configuration
f4s
f6s
f8s
f9s
f10s
f11s
No. of levels used
4
13
13
3
2
2
G3 (cm−1)
2583
2445
2430
2147
2267
2235
Table V
Differences between corresponding hfs intervals of two low levels of Es ii derived from two line pairs. The values are obtained by taking appropriate differences of running sums of the intervals in Table I.
Line pair
3547 Å
3602 Å
3670 Å
3728 Å
Interval differences, cm−1
2.095
2.095
3.993
4.001
5.696
5.693
7.227
7.226
8.554
8.550
9.695
9.705
10.641
10.659
Table VI
Values of θ1, θ2, and θ3 for the 5I8 and 3I7 levels of Es ii.