J-F Wyart, Ali Meftah, Wan-U Lydia Tchang-Brillet, Norbert Champion, O Lamrous, Nissan Spector, J Sugar
Recent breakthrough in the analysis of Nd IV resulted in the establishment of 37 energy levels of the ground configuration 4f^3. We report here the completion to all 41 levels of this configuration. Wavelength measurements extended to 2800 A and in higher excitation conditions lead to the classification of 1426 lines involving the excited configurations 4f^2 5d, 4f^2 6p, 4f^2 6s. Owing to configuration mixing between 5p^6 4f^2 6p and the core-excited 5p^5 4f^4, numerous 5p^6 4f^2 5d - 5p^5 4f^4 transitions, normally dipole-forbidden, are observed. Altogether 108 odd parity levels and 119 even parity ones have been established. their parametric least-squares fits have rms deviations of 91 cm^-1 and 37 cm^-1 respectively. The interaction 5p^6 4f^2 5d - 5p^5 4f^3 5d has an impact on the 4f^3 - 4f^2 5d transition probabilities computed by means of the cowan codes. Theoretical values of lifetimes are reported for all the even parity levels.
Journal of Physics B-Atomic Molecular and Optical Physics
emission spectrum, energy levels, free-ion, parametric fits, triply ionized, wavelengths
, Meftah, A.
, Tchang-Brillet, W.
, Champion, N.
, Lamrous, O.
, Spector, N.
and Sugar, J.
Analysis of the Free Ion Nd<sup>3+</sup> Spectrum (Nd IV), Journal of Physics B-Atomic Molecular and Optical Physics
(Accessed November 30, 2023)