Lifetimes of (2p53s1,3P) levels of Na II

Accurate calculations of energies and oscillator strengths for light neon-like ions

“…In general, many experiments agree well with ours and other reliable theories, but few notable exceptions exist. For example, the lifetime of [5] differs from ours by about 4 standard deviations, which is due to some systematic error, because after re-evaluation by Träbert [6] the difference is reduced to only one standard deviation. The measurements by Westerlind et al [9] also significantly disagree with ours and the CIV-3 theories for the 2p 5 3s 1 P 1 level, for which the theories are expected to be more accurate than for the corresponding triplet state.…”

“…Comparison of CI-MBPT lifetimes for 2p 5 3s 1 P 1 (the upper panel) and for 2p 5 3s 3 P 1 (the lower panel) states with experimental data, semiempirical calculations by Curtis et al [4] and calculations performed with the CIV-3 code by Hibbert et al [14]. The points with error bars represent experimental data: a-Curtis et al [4], b-Schlagheck [5], c-re-evaluation by Träbert [6] of the original data of [5,7], d-Buchet et al [8], e-Träbert [6], f-Westerlind et al [9], g-Kirm et al [10], h-Gardner et al [11], i-Berry et al [12].…”

“…Although energy levels of low-Z ions are measured with high precision, results of lifetime experiments [4][5][6][7][8][9][10][11][12] are very uncertain and a reliable theory is needed to analyse experiments, to improve accuracy and to extend transition rate data to a broader range of ions for which experiments are even more problematic. Many calculations for low-Z neonlike ions, neutral neon and argon are based on semiempirical methods of a single-or fewconfiguration type in the intermediate coupling.…”

Data-based methods for isoelectronic prediction of atomic lifetimes and energy levels

“…l/(Z -9). This includes our values for S VI1 and C1 VI11 data [49] as well as the available data for Ne I [52, 531 and Na I1 [54]. Earlier measurements [SO, 511 for S VII, C1 VI11 and Ar IX were omitted because they are of lower precision, and confuse the plot with scattering about the recent results without altering a weighted fit to the data.…”

“…Earlier measurements [SO, 511 for S VII, C1 VI11 and Ar IX were omitted because they are of lower precision, and confuse the plot with scattering about the recent results without altering a weighted fit to the data. The error bars denote the quoted uncertainties for all cases except the Na I1 resonance transition, where the quoted error [54] was unrealistic (0.5%) and was increased by a factor of ten. For this sequence it was necessary to make separate fits to eq.…”