Byron A. Palmer, Richard A. Keller, Frank V. Kowalski, and John L. Hall, "Accurate wave-number measurements of uranium spectral lines," J. Opt. Soc. Am. 71, 948-952 (1981)
Wave-number measurements were made on 10 uranium and 2 thorium transitions using the optogalvanic effect in a hollow-cathode discharge to position a single-frequency, cw dye laser to the peak of a transition. The wave number of the dye laser was measured by comparing it with the wave number of an iodine-stabilized He–Ne laser. The accuracy of the wave-number measurements was ±0.0006 cm−1. The data agree within ±0.002 cm−1 with previously reported uranium and thorium measurements whose estimated accuracy was ±0.003 cm−1.
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Ref. 1.
Ref. 2.
The wave numbers listed in this column are from measurements made on strong lines and exhibit larger-than-average errors because of some self-reversal.
Ref. 3.
Table 3
Comparison of Wave-Number Measurements on Thorium with Previous Valuesa
Ref. 1.
Energy levels determined by a statistical fit to all transitions involving these levels. The increased accuracy sf these data is the result of a statistical fit to 139 transitions (620-cm−1 level) and 19 transitions (141-cm−1 interval).
Ref. 3.
Could not be determined because there were no measurements on transitions connecting these levels.
Tables (4)
Table 1
Statistics of Wave-Number Measurement and Peak Finding
Measurement Number
Wave Number
Try 1
Try 2
Try 3
1
15688.2111
15688.2127
15688.2119
2
15688.2111
15688.2111
15688.2119
3
15688.2111
15688.2119
15688.2119
4
15688.2127
15688.2111
15688.2119
5
15688.2119
15688.2119
15688.2119
6
15688.2119
15688.2119
15688.2127
7
15688.2119
15688.2119
15688.2119
8
15688.2119
15688.2127
15688.2127
9
15688.2119
15688.2127
15688.2111
10
15688.2119
15688.2119
15688.2127
Average
15688.21174
15688.21198
15688.21206
Uncertainty
0.0005
0.0006
0.0005
Final Average, 15688.2119 ± 0.0002 cm−1
Table 2
Comparison of Wave-Number Measurements on Uranium with Previous Values
Ref. 1.
Ref. 2.
The wave numbers listed in this column are from measurements made on strong lines and exhibit larger-than-average errors because of some self-reversal.
Ref. 3.
Table 3
Comparison of Wave-Number Measurements on Thorium with Previous Valuesa
Ref. 1.
Energy levels determined by a statistical fit to all transitions involving these levels. The increased accuracy sf these data is the result of a statistical fit to 139 transitions (620-cm−1 level) and 19 transitions (141-cm−1 interval).
Ref. 3.
Could not be determined because there were no measurements on transitions connecting these levels.