Earl F. Worden and John G. Conway, "Laser spectroscopy of neptunium; first ionization potential, lifetimes and new high-lying energy levels of Np i," J. Opt. Soc. Am. 69, 733-738 (1979)
The first ionization potential of neptunium has been determined from the photoionization threshold and from Rydberg series observed by laser spectroscopy techniques. The Rydberg series convergence limits yield the most accurate value of 50 536(4) cm−1 [6.2657(5) eV]. The radiative lifetimes of five levels in the 26 200–29 050-cm−1 range have been measured. New energy levels, 27 odd and 37 even, in the 33 000–37 000-cm−1 range have been determined with approximately ± 0.5-cm−1 precision.
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Wavelengths, transitions and energy levels from Ref. 6.
Uncertainty is three times standard deviation. The conversion factor 1 eV = 8065.479 cm−1 was used.
TABLE II
Rydberg series limits determined by stepwise laser excitation techniques for Np and ionization potentials derived.
All first-step transitions are from the ground state of Np i. Wavelengths are from Ref. 6.
High even-levels determined by laser spectroscopy. The levels are accurate to about ± 0.5 cm−1. Odd-level values are from Ref. 7.
Uncertainties in parenthesis are estimates from quantum defect plots, see Figs. 4 and 5.
Levels in the ion are from Ref. 10.
The conversion factor 1 eV = 8065.479 cm−1 was used.
TABLE III
First ionization potentials of neptunium determined by various techniques.
Level energy, transition assignment and wavelength from Ref. 6.
Branching ratio estimated from intensities in Ref. 6.
TABLE V
High even levels of neptunium observed from the three odd levels given as headings for the first three colunms (excitation wavelength, energy and J value).
The uncertainty is ±0.5 cm−1 for levels with two or more observed values and ±1 cm−1 for the others.
TABLE VI
High odd levels of Np obtained from the 19373.87 cm−1, J = 3.5 even level populated by λ1 at 6043.282A (2831–19373). The J of the upper levels observed could be 2.5, 3.5, or 4.5.
Wavelengths, transitions and energy levels from Ref. 6.
Uncertainty is three times standard deviation. The conversion factor 1 eV = 8065.479 cm−1 was used.
TABLE II
Rydberg series limits determined by stepwise laser excitation techniques for Np and ionization potentials derived.
All first-step transitions are from the ground state of Np i. Wavelengths are from Ref. 6.
High even-levels determined by laser spectroscopy. The levels are accurate to about ± 0.5 cm−1. Odd-level values are from Ref. 7.
Uncertainties in parenthesis are estimates from quantum defect plots, see Figs. 4 and 5.
Levels in the ion are from Ref. 10.
The conversion factor 1 eV = 8065.479 cm−1 was used.
TABLE III
First ionization potentials of neptunium determined by various techniques.
Level energy, transition assignment and wavelength from Ref. 6.
Branching ratio estimated from intensities in Ref. 6.
TABLE V
High even levels of neptunium observed from the three odd levels given as headings for the first three colunms (excitation wavelength, energy and J value).
The uncertainty is ±0.5 cm−1 for levels with two or more observed values and ±1 cm−1 for the others.
TABLE VI
High odd levels of Np obtained from the 19373.87 cm−1, J = 3.5 even level populated by λ1 at 6043.282A (2831–19373). The J of the upper levels observed could be 2.5, 3.5, or 4.5.