Oscillatory screening and quantum interference effects on electron collisions in quantum plasmas

Na, Sang-Chul; Jung, Young-Dae

doi:10.1016/j.physleta.2008.06.067

Cited by 53 publications

(29 citation statements)

References 5 publications

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“…[6][7][8] The ECSCP potential is the real space solution of the Thomas Fermi model and is also used in solid-state physics [9][10][11] and in different problems including laser produced plasmas. [12][13][14][15][16][17] Further the ECSCP potential plays an important role in finding the stability of the energy levels of positronium in solids. 10 The critical screening parameters for hydrogen-like systems have been determined analytically by Dutta 18 and variationally by Lam and Varshni.…”

Section: Introductionmentioning

confidence: 99%

Magnetic dipolar and quadrupolar transitions in two-electron atoms under exponential-cosine-screened Coulomb potential

2015

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A detailed investigation of the magnetic dipolar and quadrupolar excitation energies and transition probabilities of helium isoelectronic He, Be 2þ , C 4þ , and O 6þ have been performed under exponential cosine screened Coulomb potential generated in a plasma environment. The low-lying excited states 1s 2 : 1 S e ! 1sns: 3 S e 0 , and 1snp: 3 P o 2 (n ¼ 2, 3, 4, and 5) are considered. The variational time-dependent coupled Hartree-Fock scheme has been used. The effect of the confinement produced by the potential on the structural properties is investigated for increasing coupling strength of the plasma. It is noted that there is a gradual destabilization of the energy of the system with the reduction of the ionization potential and the number of excited states. The effect of the screening enhancement on the excitation energies and transition probabilities has also been investigated and the results compared with those available for the free systems and under the simple screened Coulomb potential. V C 2015 AIP Publishing LLC. [http://dx.

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Section: Introductionmentioning

confidence: 99%

Magnetic dipolar and quadrupolar transitions in two-electron atoms under exponential-cosine-screened Coulomb potential

2015

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“…So, the Debye-Huckel model is not reliable for investigating the physical properties of quantum plasmas. 35 Recently, Shukla and Eliasson 36 have showed that in a dense quantum plasma, the effective potential of a test charge of mass m can be modelled by a modified Debye-Huckel potential or exponential cosine-screened potential (ECSCP) of the form VðrÞ ¼ ð1=rÞe Àlr cosðlrÞ ðin a:u:Þ;…”

Section: Introductionmentioning

confidence: 99%

Positron impact excitations of hydrogen atom embedded in dense quantum plasmas: Formation of Rydberg atoms

Rej

Ghoshal

2014

Physics of Plasmas

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Formation of Rydberg atoms due to 1 s ! nlm excitations of hydrogen by positron impact, for arbitrary n, l, m, in dense quantum plasma has been investigated using a distorted wave theory which includes screened dipole polarization potential. The interactions among the charged particles in the plasma have been represented by exponential cosine-screened Coulomb potentials. Making use of a simple variationally determined hydrogen wave function, it has been possible to obtain the distorted wave scattering amplitude in a closed analytical form. A detailed study has been made to explore the structure of differential and total cross sections in the energy range 20-300 eV of incident positron. For the unscreened case, our results agree nicely with some of the most accurate results available in the literature. To the best of our knowledge, such a study on the differential and total cross sections for 1 s ! nlm inelastic positron-hydrogen collisions in dense quantum plasma is the first reported in the literature. V C 2014 AIP Publishing LLC.

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“…3,17,[19][20][21][22][23] DQPs are characterized by a low-temperature (10 2 À 10 5 K) and a high number density (10 18 -10 23 cm -3 ), 24 and the coupling parameter is larger than 1. DQPs have been found in various areas, such as semiconductor devices, 25 laser-produced dense plasmas, 26 and dense astronomical systems.…”

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confidence: 99%

“…It is noted that ECSCP is weaker than SSCP due to the existence of a cosine term. The presence of the cosine term also leads to the oscillatory screening effects 17,22,23 in DQPs. As a result, plasma screening effects of DQPs on the atomic collision dynamics differ from those in WCPs.…”

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confidence: 99%

Dynamics of the fully stripped ion-hydrogen atom charge exchange process in dense quantum plasmas

et al. 2014

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The plasma screening effects of dense quantum plasmas on charge exchange processes of a fully stripped ion colliding with a hydrogen atom are studied by the classical trajectory Monte Carlo method. The inter-particle interactions are described by the exponential cosine-screened Coulomb potentials. It is found that in weak screening conditions, cross sections increase with the increase of the ionic charge Z. However, in strong screening conditions, the dependence of cross sections on the ionic charge is related to the incident particle energy. At high energies, cross sections show a linear increase with the increase of Z, whereas at low energies, cross sections for Z≥4 become approximately the same. The He2+ and C6+ impacting charge exchange cross sections in dense quantum plasmas are also compared with those in weakly coupled plasmas. The interactions are described by the static screened Coulomb potential. It is found that for both He2+ and C6+, the oscillatory screening effects of dense quantum plasmas are almost negligible in weak screening conditions. However, in strong screening conditions, the oscillatory screening effects enhance the screening effects of dense quantum plasmas, and the enhancement becomes more and more significant with the increase of the screening parameter and the ionic charge.

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Oscillatory screening and quantum interference effects on electron collisions in quantum plasmas

Cited by 53 publications

References 5 publications

Magnetic dipolar and quadrupolar transitions in two-electron atoms under exponential-cosine-screened Coulomb potential

Magnetic dipolar and quadrupolar transitions in two-electron atoms under exponential-cosine-screened Coulomb potential

Positron impact excitations of hydrogen atom embedded in dense quantum plasmas: Formation of Rydberg atoms

Dynamics of the fully stripped ion-hydrogen atom charge exchange process in dense quantum plasmas

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