The resonance line spectra of ions in the Xe i isoelectronic sequence, consisting of the 5 transitions to the 5p6 1S0 ground state from levels with J = 1 in the 5p5 5d and 6s configurations, have been observed for Cs ii, Ba iii, and La iv. The observations were made with a sliding spark on the 10.7-m normal-incidence vacuum spectrograph at NBS. The resonance transitions from the 5p5 6d and 7s configurations were also observed for these ions, except for that from 5p5 6d3P1 of Ba iii. Several resonance transitions from higher nd and ns levels were also observed. Estimated values for the J = 1 levels of the 5p5 7s configuration of Ce v were obtained by extrapolation. The derived ionization energies in eV are Cs ii 23.17(4), Ba iii 35.79(6), La iv 45.95(6), Ce v 65.55(25).
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C—designation changed from that in AEL, Ref. 6; UD—designation unchanged from AEL; ND—previously undesignated level, newly designated here; NL—new level.
This level corresponds to level
in AEL. The level value there contains a misprint; it should be 169 183.40, as given in Ref. 5.
TABLE II
Resonance lines of Ba iii. The uncertainty of the wavelengths is ±0.005 Å.
λ (Å)
I
σ (cm−1)
Upper level
743.121
50 000
134 568
5p55d3P1
653.364
3 000
153 054
5d3D1
647.279
100 000
154 493
6s 3/2[3/2]1
587.548
15 000
170 199
6s 1/2[1/2]1
555.478
20 000
180 025
5d1P1
456.958
50
218 838
7s 3/2[3/2]1
448.944
150
222 745
6d3D1
423.844
1
235 936
7s 1/2[1/2]1
420.119
10
238 028
6d1P1
403.818
2
247 636
7d3D1
TABLE III
Resonance lines of La iv. The uncertainty of the wavelengths is ±0.003 Å.
1 eV = 8065.479 cm−1; see E. R. Cohen and B. N. Taylor, J. Phys. Chem. Ref. Data 2, 663 (1973).
G. L. Epstein and J. Reader, observations of Cs iii and Ba iv.
G. L. Epstein and J. Reader, J. Opt. Soc. Am. 60, 712 (1970).
J. Reader and J. O. Ekberg, J. Opt. Soc. Am. 62, 464 (1972).
Tables (4)
TABLE I
Resonance lines of Cs ii. The uncertainty of the wavelengths is ± 0.005 Å.
C—designation changed from that in AEL, Ref. 6; UD—designation unchanged from AEL; ND—previously undesignated level, newly designated here; NL—new level.
This level corresponds to level
in AEL. The level value there contains a misprint; it should be 169 183.40, as given in Ref. 5.
TABLE II
Resonance lines of Ba iii. The uncertainty of the wavelengths is ±0.005 Å.
λ (Å)
I
σ (cm−1)
Upper level
743.121
50 000
134 568
5p55d3P1
653.364
3 000
153 054
5d3D1
647.279
100 000
154 493
6s 3/2[3/2]1
587.548
15 000
170 199
6s 1/2[1/2]1
555.478
20 000
180 025
5d1P1
456.958
50
218 838
7s 3/2[3/2]1
448.944
150
222 745
6d3D1
423.844
1
235 936
7s 1/2[1/2]1
420.119
10
238 028
6d1P1
403.818
2
247 636
7d3D1
TABLE III
Resonance lines of La iv. The uncertainty of the wavelengths is ±0.003 Å.
1 eV = 8065.479 cm−1; see E. R. Cohen and B. N. Taylor, J. Phys. Chem. Ref. Data 2, 663 (1973).
G. L. Epstein and J. Reader, observations of Cs iii and Ba iv.
G. L. Epstein and J. Reader, J. Opt. Soc. Am. 60, 712 (1970).
J. Reader and J. O. Ekberg, J. Opt. Soc. Am. 62, 464 (1972).
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