Screening-constant-by-unit-nuclear-charge calculations of high lying and states of the ion

Modified Atomic Orbital Theory Applied to the Study of High Lying (2pns) 1,3P° and (2pnd) 1,3P° Rydberg Series of B+

“…The results of the presently calculations for the energy positions of doubly (2pns) 1,3 P° and (2pnd) 1,3 P° excited state of the B + atom are listed in Table 1, Table 2, Table 3, Table 1: Energy positions (E) of doubly (2pns) 1 P° excited states of B + . The present MAOT results are compared to the Screening Constant by Unit Nuclear Charge (SCUNC) results of Sakho, et al [7]; Multiconfiguration Relativistic Random-Phase Approximation (MCRRPA) computations of Hsiao, et al [6]; Noniterative Eigenchannel R-Matrix (NER-M:) results of Kim and Manson [5]; R-Matrix (R-M) calculations of Tully, et al [4]; Advanced Light Source (ALS) experiments of Schippers, et al [3] and to the Vaccum Ultraviolet (VU) measurements of Janniti, et al [2]. The results are expressed in eV.…”

“…• Table 4 and Table 5. In Table 1 we present a comparison of energy positions of the doubly 2pns 1 P° excited states of B + atom obtained from the present Modified Atomic Orbital Theory (MAOT) with the absorption spectrum of B II in the vacuum ultraviolet results of Janniti, et al [2], the R-Matrix (R-M) calculations of Tully, et al [4], the Noniterative Eigenchannel R-Matrix (NER-M) results Kim and Manson [5], the Multiconfiguration Relativistic Random-Phase Approximation (MCRRPA) computations of Hsiao, et al [6], the Screening Constant by Unit Nuclear Charge SCUNC values of Sakho, et al [7], and with the Advanced Light Source (ALS) experiments of Schippers, et al [3]. On the other hand, our present results are quoted with uncertainties.…”

“…The screening constants in equations (6) and 7are evaluated using a photon-ion merged-beams arrangement results [3] on B + for the 2p4s 1 P° (m = 4) and 2p5s 1 P° (q = 5) levels respectively equal to (in eV) 0.220 ± 0.001 and 0.106 ± 0.007and that of the 2p3d 1 P° (m = 3) and 2p4d 1 P° (q = 4) states at 0.034 ± 0.002 and 0.016 ± 0.002 respectively. Using these experimental data (with Z = 5), we obtain from equations (6) and (7) the empirical values of the screening constants…”

“…theoretical side, Tully, et al [4] reported energy positions for the 2pns 1 P° (n = 4-6) and 2pnd 1 P° (n = 4-6) levels of B + along with resonance widths respectively by using R-matrix method; Kim and Manson, [5] investigated the photoionization of the 1 S ground state of Be-like B + ion leading to the 2s, 2p, 3s and 3p states employing a Noniterative Eigenchannel R-Matrix (NER-M) method; Hsiao, et al [6] studied five Rydbergs series of doubly excited 2pns 1,3 P°, 2pnd 1,3 P° and 2pnd 3 D° states in the photoionization spectrum of the singly-ionized boron by using the Multiconfiguration Relativistic Random-Phase Approximation (MCRRPA); Sakho, et al [7] reported accurate results for energy positions of the (2pns) 1,3 P° and (2pnd) 1,3 P° Rydberg states (n = 3-60) along with resonance widths of the (2pns) 1 P° and (2pnd) 1 P° (n = 3-20) of the B + ion by using the Screening Constant by Unit Nuclear Charge (SCUNC) method. Using the MAOT method [8][9][10][11], Sow, et al [9] reported accurate energy positions for the 2pns 1,3 P° and 2pnd 1,3 P° levels of the Beryllium atom up to n = 25 along with resonance widths in the particular case of the 2pns 1 P° states (n = 3-25).…”

Benchmarking Atomic Data for Astrophysics: Be-like Ions between B ii and Ne vii

“…The energies for the 2lnl ′ 1 S (n = 2 − 6) states and transition rates for the 2lnl ′ 1 S − 2s2p 1 P transition were calculated by Zhang & Gou (2005) for the beryllium isoelectronic sequence (Z = 4-10) using a configuration interaction method. Excitation energies of the 2pns 1,3 P and 2pnd 1,3 P Rydberg states (n = 3-60) in B II were semi-empirically determined by Sakho et al (2013) in the framework of the screening-constant-by-unitnuclear-charge method. Savukov & Markhotok (2006) performed many-body perturbation theory (MBPT) calculations for a large number of energy levels in Be-like Ne VII.…”