Wavelengths and transition probabilities in the quartet spectrum of NV

Abstract

Energies and structures of ls2snl4L and ls2pnl'4L core-excited levels in lithium-like NV are calculated. Wavelengths, transition probabilities and radiative lifetimes are reported and compared with available experimental data. It is suggested that the 1 s2p4d4P °, 4D° levels are nearly degenerate in NV and have not been resolved experimentally. Several new assignments for observed lines are proposed.

Low-lying quartet states in Li-like neon

“…part smaller than those calculated, as noted by Laughlin [10] for N V, and this deviation is significantly increased for the 1s2pnl states. Cascade effects do not explain these deviations because increasing the population of the levels studied would have the effect of increasing the measured lifetimes.…”

“…term-energy splitting behaviour of the n = 3 levels in the isoelectronic sequence is linear. As discussed by Blanke et al [11] and Laughlin [10] for the terms of 1s2p4d, this dependence is not evident for Z 7 because 1s2p4d 4 P o could mix strongly with 1s2s5p 4 P o . However, for Z 8, this latter term is far from the n = 4 complex and we can expect to recover a linear behaviour for Ne VIII.…”

“…However, for Z 8, this latter term is far from the n = 4 complex and we can expect to recover a linear behaviour for Ne VIII. According to Laughlin [10] the assignment of Blanke et al [11] for N V 1s2p 2 4 P-1s2p4d 4 P o is incorrect.…”

“…Thus, the optical spectroscopy of n = 0 transitions between the lowest-lying ISEQUAS 1s2s2p 4 P o and 1s2p 2 4 P [5,6] and of the n = 1, 2 transitions from the states 1s2ln l 4 L; l = s, p; l = s, p, d, f; n = 3, 4 have been carried out extensively for Z 9 [7][8][9][10][11][12]. Mg X, Al XI and Si XII by Blanke et al [13] and Si XII, S XIV and Ar XVI by Khardi et al [14] and even the triply excited state 2p 3 4 S o from He − to C IV [15][16][17] have also been investigated.…”

Further investigations on doubly excited four-electron ions: beam-foil experiment and MCDF theory

“…They mix strongly with configurations of the form Is2s2p41 for the elements N, 0 and F, as discussed in this work. The influence of the mixing might be minor for Fand This theoretical approach was tested for the lifetimes of doubly excited n = 3 quartet states for elements C to F. The results are in good agreement with model-potential calculations of Laughlin [20][21][22] and with experimental values [23,24] gained by the beam-foil method [25]. We emphasize that mixing inside the complex is essential for most of the quartet transitions, but mixing with near perturbers with n = 4 could safely be neglected for the n = 3 states.…”