Joseph Reader, Gabriel L. Epstein, and Jan Olof Ekberg, "Spectra of Rb ii, Sr iii, Y iv, Zr v, Nb vi, and Mo vii in the Vacuum Ultraviolet," J. Opt. Soc. Am. 62, 273-284 (1972)
The characteristic resonance-line spectrum in the Kr i isoelectronic sequence, consisting of the five transitions to the 4p6 1S0 ground state from levels with J = 1 in the 4p54d and 5s configurations has been observed from Rb ii to Mo vii. The observations were made with sliding sparks, on the 10.6-m normal-incidence spectrograph at NBS and the 5-m grazing-incidence spectrograph in Lund. A number of transitions from higher levels of the type 4p5nd, 4p5ns, and 4s4p65p were also observed. Isoelectronic comparisons are given for all observed levels. The ionization energies in electron volts are
Rb ii 27.285
Y iv 60.60
Nb vi 102.06
Sr iii 42.87
Zr v 80.36
Mo vii 125.66.
Anomalous relative intensities observed for the 4p54d transitions are found to be caused by excitation conditions within the light source.
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Operating data for sliding spark at NBS. The external inductance is given as the number of turns used in a closely wound coil with diameter of 10 cm. The external resistance is given as either the number of plates used in a carbon-plate-contact resistor or the ohmage of a conventional rheostat.
All lines measured in Washington.
LMS—Laporte, Miller, and Sawyer2; DT–D. H. Tomboulian, Phys. Rev. 54, 350 (1938).
Blended with O ii; λ and σ calculated from level scheme (see Ref. 9).
Not an observed line; σ calculated from level scheme (see Ref. 9).
W—measured in Washington, L—measured in Lund.
Not an observed line; σ taken from level scheme of W. Persson and S. Valind, private communication, 1971.
All lines measured in Lund.
GC—Charles4; MC—Chaghtai.6
This line is apparently present on Chaghtai’s spectrogram, Ref. 14. However, his identification of it as a line given by Charles was erroneous.
Also apparently present on Chaghtai’s spectrogram. However, his wavelength is in error by 0.19 Å, probably due to use of misidentified lines noted in footnote c as standards.
Table VIII
Ionization energies of ions in the Kr i isoelectronic sequence.
Core splittings for Kr i to Y iv are from Ref. 24 and for Zr v to Mo vii from measurements of present plates. Splittings in cm−1.
Values calculated from formula given in the text.
1 eV = 8065.7 cm−1.
See Ref. 24.
G. L. Epstein and J. Reader, J. Opt. Soc. Am. 61, 673 (1971).
Table IX
Predicted and observed energies in cm−1 of the 4s4p65p configuration. Values of n*(5p) are for Rb i-like spectra.
Calculated percentage compositions for J = 1 levels of the 4p54d and 5s configurations of Y iv. Parameters are given in Fig. 1.
Designation
Basis states
4d3P1
4d3D1
4d1P1
5s3P1
5s1P1
4d3P1
97.37
2.58
0.02
0.03
0.00
4d3D1
2.52
96.81
0.67
0.00
0.00
4d1P1
0.08
0.61
99.03
0.01
0.27
0.02
0.00
0.09
49.38
50.51
0.02
0.00
0.19
50.57
49.22
Tables (10)
Table I
Operating data for sliding spark at NBS. The external inductance is given as the number of turns used in a closely wound coil with diameter of 10 cm. The external resistance is given as either the number of plates used in a carbon-plate-contact resistor or the ohmage of a conventional rheostat.
All lines measured in Washington.
LMS—Laporte, Miller, and Sawyer2; DT–D. H. Tomboulian, Phys. Rev. 54, 350 (1938).
Blended with O ii; λ and σ calculated from level scheme (see Ref. 9).
Not an observed line; σ calculated from level scheme (see Ref. 9).
W—measured in Washington, L—measured in Lund.
Not an observed line; σ taken from level scheme of W. Persson and S. Valind, private communication, 1971.
All lines measured in Lund.
GC—Charles4; MC—Chaghtai.6
This line is apparently present on Chaghtai’s spectrogram, Ref. 14. However, his identification of it as a line given by Charles was erroneous.
Also apparently present on Chaghtai’s spectrogram. However, his wavelength is in error by 0.19 Å, probably due to use of misidentified lines noted in footnote c as standards.
Table VIII
Ionization energies of ions in the Kr i isoelectronic sequence.
Core splittings for Kr i to Y iv are from Ref. 24 and for Zr v to Mo vii from measurements of present plates. Splittings in cm−1.
Values calculated from formula given in the text.
1 eV = 8065.7 cm−1.
See Ref. 24.
G. L. Epstein and J. Reader, J. Opt. Soc. Am. 61, 673 (1971).
Table IX
Predicted and observed energies in cm−1 of the 4s4p65p configuration. Values of n*(5p) are for Rb i-like spectra.
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