Excitation energies and oscillator strengths for the 3p⁶3d²D to 3p⁵3d²²P⁰,²D⁰,²F⁰transitions in Sc²⁺, Ti³⁺and V⁴⁺

Excitation energies and oscillator strengths for the 1s 2 2s 2 2p 6 3s 2 3p 6 3d 2 D e →1s 2 2s 2 2p 6 3s 2 3p 5 3d 2 2 P o , 2 D o , 2 F o transitions in V4 +

“…Tables 2-4 exhibit our present multiconfiguration Hartree-Fock (MCHF) and our [5] earlier configuration interaction (CI), excitation energies ( E) as well as optical oscillator Table 2. Excitation energies ( E) and optical oscillator strengths (OOS), of both the length ( f L ) and velocity ( f V ) forms of the inner-shell excitation 1s 2 2s 2 2 p 6 3s 2 3p 6 3d 2 D e → 1s 2 2s 2 2 p 6 3s 2 3p 5 3d 2 2 P o transition in V 4+ ion of the potassium isoelectronic sequence.…”

“…Both experimentalists [1][2][3] and theorists [4][5][6][7][8][9][10][11][12][13][14][15][16] have shown great interest in the innershell excitation of alkali metal atoms and alkali-like ions, because inner-shell excitation may lead to autoionization which has an important role in explaining the structure observed in the total ionization cross-section curves for electron impact. Consequently, the reliable theoretical calculation of position of the autoionizing level and the theoretical estimate of the excitation threshold, which is used in the calculation of the oscillator strengths, of both length and velocity forms, is of special interest.…”

Oscillator Strengths of the 1s2s1Se→ 1s2p1P0Transition in He

“…We have carried out our calculations using the computer CIV3 of Hibbert [16] in the same way as in our earlier work [1][2][3][4][5][6][7][8][9][10][11][12][13]. The CI wave function is written as Each of the M single-configuration function Φi is constucted from one-electron functions, whose orbital and spin momenta are coupled to form the common total angular momentum quantum number L and S according to the prescription denoted in (1) by αi.…”

“…Tiwary and his coworkers [1][2][3][4][5][6][7][8][9][10][11][12][13] have extensively investigated both the length and velocity forms of both the relativistic and non relativistic optical oscillator strengths in several atoms and ions using Hartree-Fock (HF) and configuration interaction (CI) wave functions. Most recently, Tiwary [11][12][13] has shown that the choice of configurations and orbitals employed in configurations plays an extremely important role in order to have a very compact CI calculation which yields an excellent agreement between fL and fV.…”

Relativistic many-body calculation of energies, oscillator strengths, transition rates, and lifetimes of Sc III ion

“…The Sc III has been studied in a number of earlier experimental [16][17][18][19] and theoretical [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] papers. More than 40 years ago, Weiss [20] reported transition rates for the 4s − 4p and 3d − 4p transitions in K I, Ca II, and Sc III.…”