Plasma-screening effects on positronium formation

Ma, Jie; Wang, Yuancheng; Zhou, Yajun; Wang, Heng

doi:10.1088/1674-1056/27/1/013401

Cited by 5 publications

(3 citation statements)

References 35 publications

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“…It is noted that this NSDH potential has also been adopted for positron-ion collision in Debye plasmas. [14,15] In contrast to the NSDH potential of Eq. ( 2), the screened CB interaction is expressed by the spherical DH (SDH) potential [12] V…”

Section: Introductionmentioning

confidence: 99%

Debye-screening effect on electron-impact excitation of helium-like Al¹¹⁺ and Fe²⁴⁺ ions

Ma¹,

Liu²,

Xie³

et al. 2022

Chinese Phys. B

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Debye-screening effects on the electron-impact excitation (EIE) processes for the dipole-allowed transition 1s2 1 S → 1s2p 1P in He-like Al11+ and Fe24+ ions are investigated using the fully relativistic distorted-wave methods with the Debye–Hückel (DH) model potential. Debye-screening effects on the continuum-bound (CB) interaction and target ion are discussed, both of which result in reduction of EIE cross sections. This reduction due to screening on the CB interaction is dominant. The non-spherical and spherical DH potentials are adopted for considering the screening effect on the CB interaction. It is found that the spherical DH potential could significantly overestimate the influence of plasma screening on EIE cross sections for multielectron He-like ions.

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Section: Introductionmentioning

confidence: 99%

Debye-screening effect on electron-impact excitation of helium-like Al¹¹⁺ and Fe²⁴⁺ ions

Ma¹,

Liu²,

Xie³

et al. 2022

Chinese Phys. B

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“…Investigation of the effect of quantum plasmas on the formation of Ps atom by scattering positrons from the ground state of hydrogen atoms using distorted wave theory [15], investigation of Ps atom formation in Debye plasma considering adiabatic dipole polarization potential [16] and investigation of Debye plasma screening effects on Ps atom formation process in positron-hydrogen collisions [17] are some of the important studies examining the effects of the plasma environment on the formation of Ps atoms. In addition to the plasma effects on the dynamics in the formation process of the Ps atom, the structural properties of the Ps atom embedded in the plasma environment have also been investigated.…”

Section: Introductionmentioning

confidence: 99%

Plasma-embedded positronium atom with energy-dependent potential

Bahar

2021

Eur. Phys. J. Plus

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In this study, for the first time in the related literature, the positronium atom embedded in the plasma environment with energy-dependent potential interaction, under spherical confinement, is investigated. The more general exponential cosine-screened Coulomb (MGECSC) potential is used to describe the interaction potential of the positronium atom in the plasma environment. Among four different sets of MGECSC potential to model Debye and quantum plasma, the most general form for calculations is considered, and thus, the positronium atom investigated contained energy-dependent potential interaction embedded in the quantum plasma environment. The energy dependence of the interaction potential is chosen linearly and rendered to a tunable case by using a dimensionless parameter. MGECSC potential is modified by considering the linear energy dependence. The nonrelativistic spectrum and wave functions of the energy-dependent MGECSC potential (energy-dependent plasma (EDP) potential) for the positronium atom are obtained using the Runge-Kutta-Fehlberg (RKF) method. The effect of the plasma shielding parameters, the spherical encompassing effect and the energy dependence on generation and control of the orbital charge-currents and the induced magnetic fields of the positronium atom are examined. Furthermore, the transition energies, the oscillator strengths and the dipole polarizability are studied for only energy dependence. For the energy-independent case, the structural property review is also performed, and the results are compared. Alternatives to each other of the effective potential parameters on the charge-currents, the induced magnetic fields and the structural properties are also discussed. The charge-current and induced magnetic field analyses are also performed for energy-dependent potential-plasma environment case, plasma environmentenergy-independent potential case, no-plasma environment-energy-dependent potential case, and no-plasma environment-energy-independent potential case.

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“…Moreover, as well as the advantages of plasmas in the production and alteration of quantum dots, the most appropriate environment to excite atomic systems for radiating is the plasma environment, which underscores the importance of plasmas for quantum dots. Since there are critical screening effects of plasmas on plasma-embedded atomic systems, remarkable theoretical studies concerned with atomic systems in plasmas have been performed [35][36][37][38][39]. Some of these studies can be summarized as follows: probe of structural properties such as plasma shielding effects on photoionization of atomic systems in plasmas [40,41], one-and two-photon ionization for atomic systems located in plasmas [42], resonance [43], polarizability [44], collision cases [45], and structural properties such as oscillator strengths and transition probabilities [46,47].…”

Section: Introductionmentioning

confidence: 99%

Confinement control mechanism for two-electron Hulthen quantum dots in plasmas

Bahar

Soylu

2018

J. Phys. B: At. Mol. Opt. Phys.

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In this study, for the first time, the energies of two-electron Hulthen quantum dots (TEHQdots) embedded in Debye and quantum plasmas modeled by the more general exponential cosine screened Coulomb (MGECSC) potential under the combined influence of electric and magnetic fields are investigated by numerically solving the Schrödinger equation using the asymptotic iteration method. To do this, the four different forms of the MGECSC potential, which set through the different cases of the potential parameters, are taken into consideration. We propose that plasma environments form considerable quantum mechanical effects for quantum dots and other atomic systems and that plasmas are important experimental arguments. In this study, by considering the quantum dot parameters, the external field parameters, and the plasma screening parameters, a control mechanism of the confinement on energies of TEHQdots and the frequency of the radiation emitted by TEHQdots as a result of any excitation is discussed. In this mechanism, the behaviors, similarities, the functionalities of the control parameters, and the influences of plasmas on these quantities are explored.

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Plasma-screening effects on positronium formation

Cited by 5 publications

References 35 publications

Debye-screening effect on electron-impact excitation of helium-like Al¹¹⁺ and Fe²⁴⁺ ions

Debye-screening effect on electron-impact excitation of helium-like Al¹¹⁺ and Fe²⁴⁺ ions

Plasma-embedded positronium atom with energy-dependent potential

Confinement control mechanism for two-electron Hulthen quantum dots in plasmas

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Plasma-screening effects on positronium formation

Cited by 5 publications

References 35 publications

Debye-screening effect on electron-impact excitation of helium-like Al11+ and Fe24+ ions

Debye-screening effect on electron-impact excitation of helium-like Al11+ and Fe24+ ions

Plasma-embedded positronium atom with energy-dependent potential

Confinement control mechanism for two-electron Hulthen quantum dots in plasmas

Contact Info

Product

Resources

About

Debye-screening effect on electron-impact excitation of helium-like Al¹¹⁺ and Fe²⁴⁺ ions

Debye-screening effect on electron-impact excitation of helium-like Al¹¹⁺ and Fe²⁴⁺ ions