W. E. Behring, J. F. Seely, C. M. Brown, U. Feldman, and J. P. Knauer, "Observation of transitions in lithiumlike germanium," J. Opt. Soc. Am. B 6, 531-533 (1989)
Transitions of the type n = 2–2, n = 2–3, and n = 3–4 in Li-like Ge29+ have been observed in the spectrum from a laser-produced plasma. The energy levels and ionization energy of Ge29+ were derived from the observed wavelengths. The wavelength of the 2s2S1/2–2p2P3/2 transition is sufficiently accurate to determine the quantum-electrodynamic contribution to the transition energy.
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Intensities based on visual estimates of plate darkening.
Wavelengths measured at present.
Wavelengths calculated by the present authors using Grant’s program.89
Calculated wavelenghts of Vainshtein and Safronava.13
Predicted wavelength based on calculated 2p2P1/2–2p2P3/2 splitting.
Doubly classified line. The 2p2P1/2–3s2S1/2 transition is expected to be much weaker than the 2p2P3/2–3d2D5/2 transition.
Possibly blended with a Ge28+ transition at 7.333 Å.14
Energy levels based on the present wavelength measurements.
Fine-structure intervals.
Energy levels calculated by the present authors using Grant’s program.8,9
Energy levels calculated by Vainshtein and Safronova.13
The 2p2P1/2 energy level was obtained from the 2p2P1/2–2p2P3/2 fine-structure interval calculated by Seely7 and the observed 2s2S1/2–2p2P3/2 wavelength. Levels not connected to the ground state are indicated by + x.
Calculated 2p2P1/2–2p2P3/2 fine-structure interval from Seely.7
Table 3
Excitation Energy, Binding Energy, and Ionization Energy (in 103 cm−1) for Ge29+
The observed excitation energy.
The binding energy calculated using Grant’s program.8,9
The ionization energy I = E + T. The adopted ionization energy is 25 766 ± 11 in units of 103 cm−1.
Tables (3)
Table 1
Wavelengths (in Å) and Classification of Spectral Lines for Ge29+
Intensities based on visual estimates of plate darkening.
Wavelengths measured at present.
Wavelengths calculated by the present authors using Grant’s program.89
Calculated wavelenghts of Vainshtein and Safronava.13
Predicted wavelength based on calculated 2p2P1/2–2p2P3/2 splitting.
Doubly classified line. The 2p2P1/2–3s2S1/2 transition is expected to be much weaker than the 2p2P3/2–3d2D5/2 transition.
Possibly blended with a Ge28+ transition at 7.333 Å.14
Energy levels based on the present wavelength measurements.
Fine-structure intervals.
Energy levels calculated by the present authors using Grant’s program.8,9
Energy levels calculated by Vainshtein and Safronova.13
The 2p2P1/2 energy level was obtained from the 2p2P1/2–2p2P3/2 fine-structure interval calculated by Seely7 and the observed 2s2S1/2–2p2P3/2 wavelength. Levels not connected to the ground state are indicated by + x.
Calculated 2p2P1/2–2p2P3/2 fine-structure interval from Seely.7
Table 3
Excitation Energy, Binding Energy, and Ionization Energy (in 103 cm−1) for Ge29+
The observed excitation energy.
The binding energy calculated using Grant’s program.8,9
The ionization energy I = E + T. The adopted ionization energy is 25 766 ± 11 in units of 103 cm−1.