Nonideality Plasma Research Articles

Non-ideal classical plasma: laser pulse effects and dynamic dipole polarizabilities

The properties of a hydrogen atom inside a non-ideal classical plasma, in terms of its behavior in the presence of an applied laser pulse, are explored. The strength of the pulse is chosen such that it maintains near sphericity of the system. The pulse parameters have a strong bearing on the final state attained by the system after its interaction with the pulse. Dynamic dipole polarizability is calculated and the poles are observed to be red shifted with an increase in non-ideality as well as an increase in plasma temperature. The polarizabilities for frequencies of the field below the frequency corresponding to the first pole are found to be greater for larger values of field frequency, plasma non-ideality and electron plasma temperature.

Collective Effects on the Transition Bremsstrahlung Spectrum due to the Polarization Interaction in Nonideal Plasmas

The collective effects on the transition bremsstrahlung spectrum due to the polarization interaction between the electron and Debye shielding cloud of an ion are investigated in nonideal plasmas. The impact parameter analysis with the effective pseudopotential model taking into account the nonideal collective and plasma screening effects is applied to obtain the bremsstrahlung radiation cross-section as a function of the nonideality plasma parameter, Debye length, photon energy, and projectile energy. It is shown that the collective effects enhance the bremsstrahlung radiation cross-section and decrease with increasing impact parameter. It is also shown that the collective effect is the most significant near the maximum position of the bremsstrahlung cross-section. In addition, it is shown that the collective effect decreases with an increase of the radiation photon energy

Screening effects on elastic electron–atom collisions in partially ionized hydrogen plasmas

The non-ideal collective and plasma screening effects on elastic electron–atom collisions are investigated in partially ionized hydrogen plasmas using the first-order eikonal method. The effective pseudopotential model, taking into account the screening and collective effects, is applied to describe the interaction potential in non-ideal plasmas. Semiclassical trajectory analysis is applied to the path of the projectile electron in order to investigate the variation of the eikonal phase and cross section as functions of the impact parameter, the non-ideality plasma parameter, the Debye length, and the collision energy. The results show that the collective and screening effects enhance the differential eikonal cross section for small impact parameters, but suppress the cross section for large impact parameters. It is also found that the non-ideal collective effects enhance the total eikonal cross section.

Nonideal effects on electron-atom bremsstrahlung in partially ionized hydrogen plasmas

The nonideal collective and plasma screening effects on nonrelativistic electron-atom bremsstrahlung process are investigated in partially ionized hydrogen plasmas. The effective pseudopotential model taking into account the screening and collective effects is applied to describe the interaction potential in nonideal plasmas. The electron-atom bremsstrahlung radiation cross section is obtained as a function of the nonideality plasma parameter, Debye length, projectile energy, and radiation photon energy. The results show that the collective and screening effects reduce the electron-atom bremsstrahlung radiation cross section in nonideal plasmas, especially, for the soft radiation region. It is also found that the atomic correlation effect suppresses the bremsstrahlung radiation cross section and is decreased with the increase in the nonideality plasma parameter.

Collective effects on the symmetric resonant charge transfer in partially ionized hydrogen plasma

The collective nonideal effects on the symmetric resonant charge transfer process in the intermediate velocity region are investigated in partially ionized hydrogen plasmas. The effective pseudopotential model taking into account the plasma screening and collective effects is applied to describe the interaction potential in nonideal plasmas. The electron transfer probability and cross section are obtained as functions of the energies of the symmetric and antisymmetric stationary states, nonideality plasma parameter, Debye length, and collision velocity. The results show that the collective effects enhance the symmetric resonant electron transfer probability as well as the electron transfer cross section in nonideal plasmas. It is also found that the collective effects on the symmetric resonant charge transfer process are more significant than the screening effects in nonideal plasmas.

Collective and Screening Effects on Entanglement Fidelity in Elastic Collisions in Nonideal Plasmas

The nonideal collective and plasma screening effects on the entanglement fidelity in elastic collisions are investigated in classical nonideal plasmas. The entanglement fidelity in nonideal plasmas is obtained as a function of the nonideality plasma parameter, Debye length, and collision energy. It is found that the plasma screening effect significantly increases the entanglement fidelity, especially for low collision energies. The entanglement fidelity is found to decrease with increasing collision energy. It is also found that the collective effect enhances the entanglement fidelity in nonideal plasmas.

Spin interference and nonideal effects on electron-electron collisions in nonideal plasmas

The spin interference and nonideal effects on electron-electron collisions are investigated in nonideal plasmas. An effective pseudopotential model taking into account the screening and nonideal effects is applied to describe the electron-electron interaction potential in nonideal plasmas. The total spin states of the collision system are considered to obtain high-energy electron-electron collision cross sections. The results show that the differential collision cross section is found to decrease with increasing nonideality plasma parameter γ in the region 0<γ<2 and, however, it increases in the region 2<γ<4. It is found that the spin interference and nonideal screening effects are especially important at the scattering angle θL=π/4. It should also be noted that the differential cross sections have minima near γ=2 and the nonideal effect is found to be more significant at the minima.

Screening and collective effects on electron-impact excitation of hydrogen-like ionsin nonideal plasmas

Plasma screening and nonideal collective effects on the electron-impactexcitation of hydrogen-like ions are investigated in nonideal plasmas. Theinteraction potential in nonideal plasmas is given by the pseudopotential model,taking into account the screening effect as well as the collective effect.The screened radial atomic wavefunctions and energy eigenvalues for the1s and 2p states of the hydrogen-like target ions in nonideal plasmasare obtained by the variational principle and perturbational method.The analytic form of the screened Coulomb focusing factor is obtained,including the plasma screening and nonideal collective effects in order toinvestigate the correct behaviour of the excitation cross section near theexcitation threshold. The excitation cross section including the screening,collective, and Coulomb focusing effects are obtained as a function ofthe nonideality plasma parameter, Debye length and kinetic energy ofthe projectile electron. It is found that the scaled 1s → 2pexcitation cross sections including the plasma screening and collective effectsare found to decrease with increasing the nonideality plasma parameter.

Collective and Plasma Screening Effects on Electron Transfer Processes in Nonideal Plasmas

Collective and plasma screening effects on the maximum principal quantum number and the maximum internuclear distance in electron transfers in nonideal plasmas are investigated. An effective pseudopotential model taking into account collective and plasma screening effects is applied to obtain the interaction potential and screened effective charge in nonideal plasmas. The screened over the barrier model is applied to obtain the electron capture radius and the maximum principal quantum number of the final state of the transferred electron. The results show that the electron capture radius is more sensitive to the collective effect rather than the plasma screening effect. The electron capture radius is found to increase with increasing nonideality plasmas parameter. It is also found that the maximum principal quantum number of the final state of the electron increases with increasing nonideality plasma parameter and reciprocal Debye length.

Nonideal effects on occurrence scattering time in classical nonideal plasmas

Nonideal plasma screening effects on the occurrence time advance for the elastic electron–ion collisions in classical nonideal plasmas are investigated using the eikonal method. An effective pseudopotential model taking into account the plasma screening and collective effects is applied to describe the electron–ion interaction potential in nonideal plasmas. It is found that the nonideal effect reduces the occurrence time advance. The scattering occurrence time gets stronger time advances with increasing the scattering angle. For small scattering angles, the domain of the nonideality plasma parameter (γ) for the minimum occurrence time advance is found to be 1<γ<3.5.

Nonideal effects on inelastic Compton scattering in a nonideal plasma

Inelastic Compton scattering of photons by hydrogenic ions in a classical nonideal plasma is investigated. An effective pseudopotential model taking into account plasma screening and collective effects is applied to describe the interaction potential in a nonideal plasma. The screened atomic wave functions and energy eigenvalues for the ground and excited states of the hydrogenic ion in a classical nonideal plasma obtained by the Ritz variational and perturbational methods. The expression for the lowest-order transition matrix element is obtained by a two-photon process associated with terms quadratic in the vector potential A. The inelastic Compton scattering cross-section horn the 1s ground state to the 2p excited state is obtained as a function of the incident photon energy, Debye length, and the non-ideality plasma parameter. It is found that the collective effect reduces the cross-section. The collective effect on the cross-section is decreased with increasing Debye length.

K-shell photoionizations in classical nonideal plasmas

Collective and plasma screening effects on photoionization cross sections from the 1s state of hydrogenic ions in classical nonideal plasmas are investigated. An effective pseudopotential model taking into account the collective and plasma screening effects is applied to describe the interaction potential in nonideal plasmas. The screened atomic wave function and energy eigenvalue for the ground state of the hydrogenic ion in classical nonideal plasmas are obtained by the Ritz variational method. The photoionization cross section is obtained by the acceleration form of the transition matrix element in order to investigate the collective and plasma screening effects on the interaction potential. The retardation and Coulomb correction effects are also considered in nonideal plasmas. The total correlation effect is obtained as a function of the nonideality plasma parameter, Debye length, and incident photon energy. The result shows that the collective effect significantly reduces the photoionization cross section. It is also found that the collective effect on the photoionization cross section is increased with increasing the incident photon energy.