Theoretical Photoionization of the Be-Like F⁵⁺ Ion: Absolute, Total, and Channel Cross Sections for the Ground 2s² and Excited 2s2p ^1,3P States

Photoionization of Be-like N3 +and Ne6 +ions: features of Be isoelectronic sequences ofZ⩽ 10

“…As a consequence of the present theoretical calculations with the previous results [14][15][16][17][18][19][20][21], we discuss the evolution of the autoionizing Rydberg resonances as the nuclear charge Z increases in the photoionization process for the relatively light elements (Z 10) of Be isoelectronic sequences.…”

“…Calculations for the Be-like sequences of Z 10 except for the Be-like N 3+ and Ne 6+ ions have been performed previously [14][15][16][17][18][19][20][21], using the noniterative variational Rmatrix method [22,23]. At present, we report the total and absolute cross sections for the photoionization of the Belike N 3+ and Ne 6+ ions for photon energy ranges from the photo-ionic 2s threshold up to the photo-ionic 3d threshold using the previous noniterative eigenchannel R-matrix method [22,23].…”

Photoionization Study on the 1s\(^{2}\)2snp \(^{1}\)P\(^\circ\), 1s\(^2\)2snd \(^{1,3}\)D, and 1s\(^{2}\)2pnd \(^{3}\)D, Rydberg Series of the Be-like \((Z=8-18)\) ions

“…On the experimental side, previous measurements have been performed on Be atoms [22] and Be-like ions, such as B + [19], C 2+ [14], N 3+ and O 4+ [3]. In addition, calculations on the Be-like sequences with Z = 6 − 10 have been performed [5,[7][8][9][10][11][12] using a non-iterative variational R-matrix method. The R-matrix approach has also been applied to report resonance energies and widths of the 2pns 1 P • and 2pnd 1 P • Rydberg series of O 4+ (n = 6 − 10) [6], F 5+ (n = 6 − 10) [5] and Ne 6+ (n = 7−9) ions [4].…”

“…In addition, calculations on the Be-like sequences with Z = 6 − 10 have been performed [5,[7][8][9][10][11][12] using a non-iterative variational R-matrix method. The R-matrix approach has also been applied to report resonance energies and widths of the 2pns 1 P • and 2pnd 1 P • Rydberg series of O 4+ (n = 6 − 10) [6], F 5+ (n = 6 − 10) [5] and Ne 6+ (n = 7−9) ions [4]. Although many calculations on various Rydberg series of Be-like ions have been performed in the past, very scarce studies are done on the 1s 2 2snp 1 P • , 1s 2 2snd 1,3 D, and 1s 2 2pnd 3 D, Rydberg series of the Be-like ions.…”

Modified Atomic Orbital Calculations of Energy and Width of the 2pns 1P\(^\circ\) and 2pnd1P\(^\circ\) Rydbergs Series of Be-like N\(^{3+}\), O\(^{4+}\), F\(^{5+}\) and Ne\(^{6+}\) Ions

“…For Be-like systems, previous measurements incorporate Be atom [3], and Be-like ions such as B + [4], C 2 + [5], N 3 + and O 4 + [6]. On the view point of theory, the R-matrix approach has been applied to report resonance energies and widths of the 2pns 1 P • and 2pnd 1 P • Rydberg series of O 4+ [7], F 5+ [8] and Ne 6+ ions [9]. In addition, the Screening Constant by Unit Nuclear Charge (SCUNC) [10] to present accurate resonance energies and widths of the 2pns 1 P • and 2pnd 1 P • Rydberg series of Be-like ions (Z = 8 − 18).…”