Th. A. M. van Kleef and Y. N. Joshi, "Seventh spectrum of selenium: Se vii and the 3p53d10 configuration in Se viii," J. Opt. Soc. Am. 67, 472-476 (1977)
The spectrum of selenium has been observed in the wavelength region 1200–100 Å on the 10.7 m normal incidence and 10.7 m grazing incidence vacuum spectrographs at the NBS Laboratory in Washington. A triggered vacuum spark was used as a source. The “pole effect” exhibited by the lines on the normal incidence spectrograms helped to discriminate different stages of ionization of the selenium spectra. All the levels belonging to the 3d94s and 3d94p configurations in Se vii have been located. The parametric level fitting calculations of the energy levels agree with the experimental values. In Se viii, the 3p53d10 2P° term has been determined.
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In the I2 column N iv means line falls on a strong N iv line; iii means masked by Se iii line and therefore observed intensity is higher than the expected value.
TABLE VI
The parameters Eav and ξp for Se viii to Zr xiv in the Co i isoelectronic sequence of the 3p53d10 2P° term (in cm−1)
Parameter
Se viii
Br ix
Kr x
Rb xi
Sr xii
Yxiii
Zr xiv
Eav
Pred.
∼866 000
Exp.
875 667
929 100
⋯
1 052 933
1 114 867
1 176 553
1 239 367
ξp
Pred.
∼27 000
Exp.
30 681
33 200
⋯
48 467
56 933
65 867
75 133
TABLE VII
3p63d9–3p53d10 transitions in Se viii
Intensity
λ(Å)
Classification
5
117.195
853 279
43
116.235
860 325
19
111.196
899 311
Tables (7)
TABLE I
Probable ionization assignment of the lines reported as Se vii lines by Rao and Murti2
In the I2 column N iv means line falls on a strong N iv line; iii means masked by Se iii line and therefore observed intensity is higher than the expected value.
TABLE VI
The parameters Eav and ξp for Se viii to Zr xiv in the Co i isoelectronic sequence of the 3p53d10 2P° term (in cm−1)