The computation of photoionization cross sections by means of the scaled Thomas-Fermi potential

Opacity

“…Stewart and Rotenberg (1965) and Kähler (1971) proposed scaled Thomas-Fermi methods while Peach (1967 used quantum defect schemes. took into account plasma interactions by using a hot Thomas-Fermi potential to calculate wave functions and one-electron energy levels.…”

Interference effects on the photoionization cross sections between two neighbouring atoms: nitrogen as an example

“…[22−28] Henry [22,23] considered the dipole length and velocity approximation and then included the effects of coupling between final-state channels to obtain the photoionization cross section of atomic nitrogen. Other methods such as the central potential method, [24] the scaled Thomas-Fermi method [25,26] and the independentparticle model [27] have also been used to predict the photoionization cross section of atomic nitrogen. Le Dourneuf et al [28] used the R-matrix method to give the photoionization cross sections of atomic nitrogen from the threshold to 3 Ryd.…”

Photoionization of the4Soground state of atomic nitrogen and atomic nitrogen4So-4P oscillator strengths

“…The earliest theoretical investigations were those of Bates and Seaton (1949) (Hartree-Fock approximation) and Dalgarno and Parkinson (1960) (Hartree bound state combined with hydrogenic and included a one-state close-coupling representation of the final continuum. A number of potential model calculations then followed: Thomas and Helliwell (1970) (Slater-Klein-Brueckner potential), Kahler (1971) and Koppel(l971) (scaledThomas-Fermi potential) whilst Ganas (1973) employed an atomic independent particle model. Cherepkov et a1 (1974) used a random phase approximation with exchange but neglected the strong final-state coupling between the 2p and 2s photoejections as well as failing to predict the N** (2s2p"S"np 'P) resonances.…”