# Young Soon KimMyongji University · Department of Physics

Young Soon Kim

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39

Publications

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Introduction

**Skills and Expertise**

## Publications

Publications (39)

Established in 2002 as a result of the first IUPAP International
Conference on Women in Physics, and subsequently ratified as one of the
permanent committees in the Korean Physical Society (KPS), the Women in
Physics Committee in Korea has been playing a central role in making
society aware of improvement of women's status through a variety of
effo...

In the present work, we report the photoionization cross sections of the Al+ ion calculated for the photon energy range 20–26 eV and 30–50 eV. We have expanded our previous calculation (2007 J. Phys. Soc. Japan 76 014302) with an optimized admixture of the initial ground state 3s21S and exited states 3s3p1,3P, 3s3d1,3D and 3s4s1,3S, and obtained si...

Resonance structures and their characteristics in the photoionization of the first excited p-states of Be-like C2+ ion which interact with the even-parity continua have been studied up to the C3+ 3d threshold limit. Using the variational R-matrix method, calculations have been performed in the initial 20 and final 22 state close-coupling approximat...

The resonant structures of absolute photoionization cross sections for N3+ ion are calculated and compared with the recent experimental measurements and the previous calculations performed in the Opacity Project. We have used a noniterative eigenchannel R-matrix method, which is different from the R-matrix used in the Opacity Project. Comparisons w...

Photoionization cross sections leading to the Al2+ 3l states from the 1S ground state of the Mg-like Al+ have been calculated using the eigenchannel R-matrix method. The calculations have been performed in LS coupling using a configuration interaction for the target states as well as for the full atomic wave functions. The lower members of autoioni...

Photoionization is one of the basic processes of light-matter interaction, which may be used to transfer at least part of quantum information from photons to electrons in the continuum in such a way that the final state electron carries composite information of the initial electron and of the incident photon. We examine how photoionization may chan...

Quadruple therapy can be considered as a first-line therapy in areas where the resistance rate to clarithromycin is high. Comparison study of triple therapy and quadruple therapy for Helicobacter pylori (H. pylori) eradication is still lacking in Korea despite the increasing prevalence of antibiotic resistance. This study was conducted to compare t...

We study propagation of correlated errors during quantum simulation due to global pulse errors. Our model system consists of a one dimensional alternating array of two distinct species (or subspaces) of atoms distributed in n lattice sites with a nearest neighbor Ising-type interaction. Time evolution is generated according to a set of quantum cell...

We investigate the third order harmonic generation for model atoms interacting with intense short laser pulses. We focus on the cases where the ponderomotive energy is not big enough to generate high-order harmonics, and where resonant transitions between bound states are also as important as multi-photon ionization and low-order harmonic generatio...

We have studied the influences of atomic parameters and laser parameters with various atomic potentials and laser intensities on high harmonic generation (HHG) by solving the time‐dependent 1‐D Schrödinger equation with a soft‐core model potential. For these purposes we examine harmonic spectra for the cases of deeply bound initial states of ions i...

The normalization screening theory first suggested for processes in which important distances are as small as the order of an electron Compton wavelength, where the wave function shapes are essentially Coulombic, is applicable in a more general context for a wider range of distances among screened wave functions. Its manifestation in various aspect...

The authors report the result of a theoretical study on the photoionisation of the 2p subshell of the sodium atom with its valence electron either in its ground state or at various different stages of excitation. The contribution from important many-body interactions to the photoionisation cross section is examined. The calculated cross section and...

Calculations of the angular distribution of the photoelectron ejected from the 2p subshell of the state of , Li and have been performed using multi-configuration Hartree - Fock (MCHF) wavefunctions. The angular distribution asymmetry parameter for is in excellent agreement with previous theoretical calculations and experimental measurements. The co...

Calculations of the photoelectron angular distribution asymmetry parameter, beta, have been performed for 2p ejection from the 1s2s2p ^4P state of Li and Be^+ using multiconfiguration Hartree-Fock (MCHF) wave functions.(C.F. Fischer, Computer Phys. Commun. 64), 369 (1991). The results are compared with each other and with He- results on the same st...

We present a quantitative study of the resonant structures of the overlapping 3pνd 1F and 3pνg 1F autoionization series in the photoionization from the bound excited 1D states of Mg-like Al+ and Si2+ ions. The interference, both constructive and destructive, between the contributions from individual processes corresponding to transitions from speci...

A comprehensive survey is presented of the behavior of all correlations Cij between the polarization of the incoming photon and the spin of the outgoing photoelectron, for ejection from all npJ subshells of uranium for photoelectron energies ranging from 1 eV to 100 keV. The numerical results for these polarization correlations are obtained within...

We present a comprehensive survey of the behavior of all correlations {ital C}{sub {ital i}{ital j}} between the polarization of the incoming photon and the spin of the outgoing photoelectron, for ejection from all subshells of uranium, for electron energies from 1 eV to 100 keV. The correlations for {ital ns}-subshell photoionization are reported...

Expressions for photoionization channel amplitudes are derived applying the Dill and Fano angular-momentum-transfer formalism to the j-l coupling scheme. This expression will be useful in understanding excited-state photoeffects of rare-gas atoms. The situation in which the present formula reduces to that of the Cooper-Zare model is also discussed.

We present a theoretical treatment for the two-electron interaction in the alkaline-earth atoms. The most important element in this procedure is the introduction of a nonlocal interaction potential for states of fixed total spin S and total orbital angular momentum L. The orbital wave function generated in this potential is capable of prediagonaliz...

A theory of two- and three-photon autoionization is presented for intermediate resonant and non-resonant cases, stressing the laser-intensity effect on the configuration mixing of the final state. Sample calculations are performed for the 5p6s1P autoionizing state. The involvement of the 5s5d intermediate state includes the effects of ac Stark shif...

We illustrate the possibility for calculation of bremsstrahlung tip angular destributions and polarization correlations from corresponding photoeffect results with an extension of the method for connecting bremsstrahlung tip and direct-radiative-recombination (DRR) cross sections developed by Lee and Pratt. The agreement between results obtained wi...

Scaling laws for direct radiative recombination (DRR) cross sections are
found which allow the computation and characterization of rate
coefficients for DRR of fast electrons with atomic ions of various ionic
species. A general overview of the problem is given, and the study of
DRR cross sections is extended to Fe and W. These data are used to
exam...

It is shown that the laser intensity modifies the configuration mixing of the ground state, intermediate states, and autoionizing states in multiphoton ionization and autoionization. To illustrate the intensity effect on autoionization, a calculation is presented for three-photon ionization of the Sr atom near the (5p6s)1P1 autoionizing resonance i...

Recent experimental study at LURE on the photoelectron spectrum of the 2p-subshell of sodium atom with its valence electron excited by laser has made it possible to examine in detail the photoionization of the inner-shell electron under changing outer-shell electronic environment. In this paper, we report the result of a comprehensive theoretical s...

A systematic quantitative estimation of the photoionization cross section from the excited p states of the rare-gas atoms is carried out in a single-configuration calculation. Our calculation has shown that the photoionization from these excited states is quasihydrogenic in nature. At a fixed photoelectron energy, the cross section is found to decr...

We point out several possible observable features of quadrupole
contributions to intermediate- and low-energy photoelectron angular
distributions dσdΩ, including zeros (Cooper minima) in the
quadrupole-matrix elements. These features result in deviations from the
dipole symmetry of dσdΩ about 90° (under
θ-->π-θ) and include an oscillation with ener...

Deviations of subshell photoionization branching ratios from the statistical ratio are examined, using full numerical calculations in screened central potentials and high-energy-limit results, focusing on the intermediate- and high-energy regimes of photoelectron energies greater than 1 keV. For intermediate- and high-Z elements there are no region...

Examples of a Cooper minimum inside the range of a shape-resonance maximum of a photoionization cross section have been found in numerical calculations within a single-electron model in a relativistic Hartree-Fock-Slater potential. In these model calculations for the photoionization of tin and uranium we find relatively broad shape resonances in al...

We examine subshell branching ratios of partial photoionization cross sections, within a relativistic single-electron screened potential, as a function of energy and principal quantum number, for uranium, tin, and carbon. We focus on features beyond the simple kinetic-energy effects made visible by the shift in photon energy, resulting from the fin...

Zeros in dipole matrix elements for high-Z elements are found to occur at significantly higher energies in our relativistic calculations than in nonrelativistic results. The energy separations of the zeros of the relativistic matrix elements are substantially magnified (a factor of >~ 10) compared to the initial bound-state spin-orbit splitting.

We show that our generalization of the Fermi-Segrè formula to arbitrary angular momentum, as well as a different expression obtained by Bouchiat and Bouchiat, can both be understood as limiting cases of a common form. This new expression, which connects energy and normalization, makes no explicit reference to inner, outer, or excited states propert...

Numerical predictions are obtained, within a relativistic multipole central-field approximation calculation, for the radial matrix elements and resulting angular distributions of photoelectrons ejected from inner through outer subshells of uranium and for photoelectron energies from near threshold (1 eV) to 100 keV. Some data are also presented for...

Internal conversion coefficients for inner shells of atomic ions of Sn are calculated for various degrees of ionization and compared with neutral atom predictions. The relativistic version of an analytic perturbation theory is used to include screening effects.

Thesis (Ph. D.)--University of Pittsburgh, 1980. Includes bibliographical references (leaves 88-92).

Using the results of an analytic perturbation theory for screened
Coulomb wave functions, closed-form expressions are given for screening
corrections to internal bremsstrahlung accompanying nuclear capture from
ns and 2p states within nonrelativistic dipole approximation. The
analytic perturbation theory is based on the expansion of the potential
i...

We report an evaluation of the dipole matrix elements for radiative
transitions (2p, 3p-->1s, 2s) between atomic inner shells using a
recently developed analytic perturbation theory for screened Coulomb
potentials. The results are simple analytic expressions which display
the dependence of the transition rate on charge Z and ionic charge
Zi. Compar...

The authors investigate the OHG efficiency by varying the frequency of the input laser, With high frequency lasers electrons need less time to travel back and forth and the quantum diffusion may be less important. We also study the effect of the intensity of the laser. Optimum laser intensity is expected to exist since the higher the intensity of t...