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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:08 |
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Conference: Bucharest University Faculty of Physics 2024 Meeting
Section: Theoretical and Computational Physics, High-Energy Physics, Applied Mathematics
Title:
Interference between discrete quasi-bound and free electron states in the angular distribution of photoelectrons
Authors:
Cristian IORGA
Affiliation:
1) Faculty of Physics, University of Bucharest, 405 Atomistilor street, Magurele, RO-077125, ROMANIA
2) National Institute for Laser, Plasma and Radiation Physics, 409 Atomistilor street, Magurele, RO-077125, Romania
E-mail
iorga.cristian@inflpr.ro
Keywords:
angular distribution, resonant photoionization, perturbation theory
Abstract:
The quasi-bound states are incorporated in the photoionization cross section by means of discrete-continuum perturbation theory [1]. The corresponding angular distribution of photoelectrons is determined within the density matrix formalism [2]. This treatment provides an efficient method of incorporating the configuration interaction between discrete and continuum states for any microscopic model of choice in conjunction with Born or distorted wave approach for free states, showcasing net improvement over the isolated-resonance and independent-processes approximation [3-5]. This model is directly applicable to central field systems, such as small molecules, atoms or nuclei, for modeling the angular distribution of ejected particles after the interaction with plane or twisted wave projectiles, and is easily amendable to account for more complex systems.
References:
[1] U. Fano, Effects of Configuration Interaction on the Intensities and Phase Shifts, Phys. Rev. A 124(1961), 1866-1878.
[2] K. Blum, Density-matrix theory and applications. New York: Plenum(1981), 1-215.
[3] C. Iorga and V. Stancalie, Linear polarization of the dielectronic recombination Kα satellite lines in Li-like Au76+, JQSRT 224(2019), 206-216.
[4] C. Iorga and V. Stancalie, Energy levels, oscillator strengths, radiative transition probabilities, level lifetimes and electron-impact excitation rate coefficients for Ne-like Mo XXXIII, ADNDT 131(2020), 101286.
[5] C. Iorga, Dynamical aspects of photoionization from the 1s22snp 1P1o levels belonging to the C III ion near the first ionization threshold, Phys. Rev. A 107(2023), 033115.
Acknowledgement:
Acknowledgement: This research was supported by Romanian Ministry of Research, Innovation and Digitalization under Romanian National Nucleu Program LAPLAS VII, Contract No. 30N/2023. Partial financial support from the Institute of Atomic Physics under Project No. F01/2020 is also acknowledged
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