MCHF studies of atomic photoionization: autoionization resonances in the partial photoionization cross sections of atomic fluorine

MCHF studies of partial photoionization cross section of atomic fluorine

“…Very recently we employed the multiconfiguration Hartree-Fock (MCHF) method for a detailed investigation of the autoionization resonances observed in the partial cross section of atomic fluorine between the 2p 4 ( 3 P-1 D) ionization thresholds [7]. The results were in excellent agreement with the experiment [8].…”

“…As a result the core ionic states 3 P and 1 D, coupled to a kd photoelectron, form ( 2 P, 2 D) and ( 2 S, 2 P, 2 D) final LS states, respectively and coupled to a ks electron form 2 P and 2 D final states. Earlier we reported the results of our investigation on the partial and total photoionization cross sections of fluorine in the photon energy region from the 3 P to 1 D threshold of F + [7]. In the present case, we considered the photon energy region from the 1 D to 1 S threshold of F + , where the autoionization resonances converging to the 1 S threshold region appear.…”

“…To describe the multielectron and multiconfiguration dynamics involved in the photoionization of fluorine, we employed the MCHF method for both bound and continuum wavefunctions [7]. When a 2p electron is photoionized from the ground state of fluorine 2s 2 2p 5 ( 2 P), it creates three 3 P, 1 D, 1 S LS multiplets of the fluorine ion.…”

“…The effect of the spin-orbit interaction was considered through the Breit-Pauli approximation. In this paper, we applied the same MCHF method [7,9,10], for bound and continuum wavefunctions to accurately analyse the high resolution experimental data of the autoionization resonance series converging to the 2s 2 2p 4 1 S limit of F + in the partial as well as in the total photoionization cross sections for photon energies between the 1 D and 1 S thresholds. Our main emphasis was to take into account in detail the effects of electron correlation to accurately determine the energies of the resonance series including the 2s2p 6 ( 2 S) resonance, which interacts very strongly with the members of the 2p 4 ( 1 S)ns 2 S series.…”

“…Our main emphasis was to take into account in detail the effects of electron correlation to accurately determine the energies of the resonance series including the 2s2p 6 ( 2 S) resonance, which interacts very strongly with the members of the 2p 4 ( 1 S)ns 2 S series. Our previous study [7,9,10] indicated that the MCHF method is capable of taking into account the electron correlation and polarization effects very effectively in an ab initio manner essential for accurate identification of the structures appearing near the thresholds. In this study, the calculation is performed in LS coupling assuming that the spin-orbit and other relativistic contributions are not considerable.…”