Abstract

A two-stage technique is developed to interpolate and extrapolate the ionization energies of Cu- and Ni-like ions along $Z$ with accuracy to the fifth significant digit. I) The first stage consists of scaling the known ionization energies (IE) along $Z$, which brings the ${\rm IE}(Z)$-function to a quasi-straight line. Function straightening detects points where the function’s smoothness breaks down. They are fitted to the ${\rm IE}(Z)$ curve in the same way as it is usually done in some experiments. Scaling on successive overlapping segments allows a confident extrapolation to the region $Z = {92}$. II) The verification of the obtained results in stage I is performed using the parameter of the relativistic model potential of a Dirac equation. The results of techniques I and II agree well up to $Z\sim{92}$.

© 2024 Optica Publishing Group

Accurate wavelengths for resonance lines of the Cu i and Zn i isoelectronic sequences for Pd to Dy

Jack Sugar, Victor Kaufman, Dae Hyun Baik, Yong-Ki Kim, and William L. Rowan
J. Opt. Soc. Am. B 8(9) 1795-1798 (1991)

Transitions and energy levels for Cu-like Yb⁴¹⁺, Ta⁴⁴⁺, and U⁶³⁺

D. R. Kania, B. J. MacGowan, C. J. Keane, C. M. Brown, J. O. Ekberg, J. F. Seely, U. Feldman, and J. Reader
J. Opt. Soc. Am. B 7(10) 1993-1996 (1990)

Transitions in Fe-, Co-, Cu-, and Zn-like ions of W and Re

J. F. Seely, C. M. Brown, and W. E. Behring
J. Opt. Soc. Am. B 6(1) 3-6 (1989)

Aluminumlike spectra of copper through molybdenum

Jack Sugar, Victor Kaufman, and William L. Rowan
J. Opt. Soc. Am. B 5(10) 2183-2189 (1988)

Spectra of the Si i isoelectronic sequence from Cu xvi to Mo xxix

Jack Sugar, Victor Kaufman, and William L. Rowan
J. Opt. Soc. Am. B 7(2) 152-158 (1990)