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    PDB 1anv-3pu4

Uranium Spectrum






Compounds of uranium do not colour a non-luminous flame. The emission spectrum is exceptionally rich in lines, which, however, are not in any way characteristic, and the detection of small quantities of uranium spectroscopically is practically impossible. Exner and Haschek enumerated in the arc spectrum 4940 lines between the wave-lengths (Angstrom units) 2263.5 and 6827.2, few of which were of marked intensity, while Kiess and Meggers have distinguished 680 lines in the yellow, red, and infra-red, up to a wave-length of 9530 Å. Measurements have been made of the wave-lengths of the lines in the spark, arc, absorption, fluorescence and phosphorescence, and high-frequency spectra.

Pollok has investigated the spark spectrum of a solution of uranium chloride, with a view to determining the most persistent lines, and records his results as follows:

Wave-length.Intensity and Persistency.Wave-length.Intensity and Persistency.Wave-length.Intensity and Persistency.
4605.44 φ3693.92 χ2969.61 φ
4603.9φ3672.72 ψ2941.92 χ
4543.87 φ3552.42 ψ2888.31'' φ
4415.42 φ3453.72 φ2865.72 χ
4371.92 φ3436.92 φ2828.11 φ
4355.84 φ3337.92 χ2794.02 χ
4341.94 φ3270.32 φ2790.81 φ
4241.94 ψ3244.42 φ2766.01 φ
4171.83 φ3093.12 χ2763.01 φ
4090.34 χ3072.92 φ2742.71 φ
3979.92 φ3058.02 χ2733.41 φ
3954.92 χ3044.32 χ2635.62 χ
3874.22 φ3006.91 φ2552.51 φ
3859.72 φ2974.21 φ2549.51 φ
3783.02 φ2971.22 φ


Exner and Haschek (loc. cit.) record the following as the most intense lines in the arc and spark spectra of uranium.


Arc Uranium Spectrum

Arc Uranium Spectrum

Wave-length.Intensity.
3932.195
4090.265
4171.745
4341.835
4355.825
5493.1510
5528.0110
5915.618
6395.688
6449.3810


Spark Uranium Spectrum

Spark Uranium Spectrum

Wave-length.Intensity.
4090.284
4241.884
4269.844
4341.894
4355.894
4472.556
4515.504
4543.797
4545.764
4555.304
4603.864
4627.265
4646.804
4689.284
5493.164
5528.024



Owing to the fact that 75 per cent, of the principal uranium lines are absent from the solar spectrum, it has been suggested that this element is probably absent from the sun, but Meyer has shown that in presence of other metals the emission spectrum of uranium is invisible, unless the latter element is present in considerable concentration, usually about 7 per cent., and this worker therefore suggests that the absence of uranium lines in the solar spectrum is due to the presence of relatively large quantities of iron.
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