Collision-induced Quantum Interference Research Articles

Renormalization screening and collision-induced quantum interference in dense plasmas

The influence of renormalization screening and collision-induced quantum interference in electron-electron collisions is investigated in partially ionized dense hydrogen plasmas. The effective interaction potential with the total spin-states of the collision system is considered to obtain the differential electron-electron scattering cross section. The results show that the renormalization plasma screening effect suppresses the electron-electron scattering cross section, including the quantum interference effect, especially, except for the forward and backward scattering directions. It is also shown that the renormalization plasma screening effect on the scattering cross section decreases with increasing collision energy. However, the renormalization screening effect is found to be important for the forward directions in the scattering cross section neglecting the quantum interference effect. The variations of the renormalization screening and collision-induced quantum interference effects are also discussed.

State-to-State Cross Sections for Rotationally Inelastic Collision of He with Na2

As a further theoretical study of the collision-induced quantum interference on rotational energy transfer in an atom-diatom system, the differential interference angles for singlet-triplet mixed states of Na 2 system in collision with He were calculated based on the first-Born approximation of time-dependent perturbation theory, taking into account the anisotropic Lennard-Jones interaction potential and the long-range interaction poten- tial. The relationships of differential interference angle versus impact parameter including collision parameter, velocity, are obtained. It is beneficial to reducing the loss in molecular cooling and trapping.

State-to-state cross sections for rotationally inelastic collision of He with Na2

As a further theoretical study of the collision-induced quantum interference on rotational energy transfer in an atom-diatom system, the differential interference angles for singlet-triplet mixed states of Na 2 system in collision with He were calculated based on the first-Born approximation of time-dependent perturbation theory, taking into account the anisotropic Lennard-Jones interaction potential and the long-range interaction poten- tial. The relationships of differential interference angle versus impact parameter including collision parameter, velocity, are obtained. It is beneficial to reducing the loss in molecular cooling and trapping.

Screened Collision-Induced Quantum Interference in Collisional Plasmas

Abstract The effects of neutral particle collisions on the quantum interference in electron-electron collisions are investigated in collisional plasmas. The effective potential model taking into account the electronneutral particle collision effects is employed in order to obtain the electron-electron collision cross section including the total spin states of the collision system. It is found that the collision effects significantly enhance the cross section. In addition, the collision-induced quantum interference effects are found to be significant in the singlet spin state. It is shown that the quantum interference effects decrease with increasing the thermal energy of the plasma. It is also shown that the quantum interference effects increase with an increase of the collision energy

Collision-induced Rotational Energy Transfer in an Atom-Diatom System

As a further theoretical study of the collision-induced quantum interference on rotational energy transfer in an atom-diatom system, based on the first-Born approximation of time-dependent perturbation theory, taking into account the anisotropic LennardJones interaction potential and the long-range interaction potential, the differential interference angles in singlet-triplet mixed states of CO A1 (v = 0)-e3 (v = l) system in collision with He, Ne, Ar, and other partners were calculated theoretically. The relationships of differential interference angle versus impact parameters, including collision parameter b and velocity, are obtained.

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

The oscillatory screening and collision-induced quantum interference effects on electron–electron collisions are investigated in dense quantum plasmas. The modified Debye–Hückel potential with the total spin states of the system is considered to obtain the differential electron–electron scattering cross section in quantum plasmas. It is shown that the electron–electron scattering cross section decreases with an increase of the quantum wave number. In addition, the minimum position of the cross section has been appeared with increasing the collision energy at the scattering angle θ L = π / 4 . It is also found that the oscillatory screening effects strongly suppress the cross section near θ L = π / 4 . In addition, it is found that the quantum interference effects suppress the cross section, especially, for the forward and backward scattering cases.

Landau damping effects on collision-induced quantum interference in electron-hole plasmas

The Landau damping effects on the quantum interference in electron collisions are investigated in a quantum plasma composed of electrons and holes. The Born method and the total spin states are considered to obtain the scattering cross-section by using the effective screened potential model. It is found that the Landau damping effects enhance the scattering cross-section, especially, near the scattering angle θL = π/4.

Differential Interference Angle of Collision-induced Rotational Energy Transfer in Na2(A1u+,v=8 b30u,v=14)-Na System

Here we report calculation of the differential interference angles (including b and b) for singlet-triplet mixed states of Na2(A1u+, v=8 b30u, v=14)-Na system in collision with Na, in order to study the collision-induced quantum interference on rotational energy transfer in an atom-diatom system. The calculation is based on the first-order Born approximation of time-dependent perturbation theory, and the anisotropic Lennard-Jones interaction potentials are also employed. The relationships between differential interference angle and impact parameter, including collision diameter and velocity, are obtained.

Quantum interference in energy transfer of CO(A 1Π, v = 0–e 3Σ −, v = 1): Differential interference angle

Collision-induced quantum interference (CQI) was demonstrated within energy transfer of CO(A 1Π, v = 0–e 3Σ −, v = 1)–He in a gas cell, where interference angle θ ST represents some ‘average’ effect for collisions with different impact parameter b and collision velocity v. By using quantum scattering theory, a method of calculating differential interference angle θ ST D , which is related to b and v, was presented. θ ST D was calculated for CO(A/e)–He with all v and b values that are physically significant. Results obtained for θ ST D are in the range of 30–70°, which imply there is no problem of cancellation between positive and negative interferences and ‘average effect’ is not serious.

Further theoretical study of collisional quantum interference on rotational energy transfer in an atom–diatom system

In our previous study (M.-T. Sun, G.-H. Sha, S.-L. Cong, F.-C. Ma, J.-C. Xie and C.-H. Zhang, Chem. Phys. Lett., 2001, 339, 413), a method of calculating the interference angle theoretically was presented, and experiments on the system CO A1Π(v = 0) ∼ e3Σ−(v = 1) in collision with He were simulated. As a further theoretical study of the collision-induced quantum interference on rotational energy transfer in an atom–diatom system, a dynamic model is described in this paper, based on the first order Born approximation of the time dependent perturbation theory and taking into account the anisotropic Lennard–Jones interaction potential. Experiments on the system CO A1Π(v = 0) ∼ e3Σ−(v = 1) in collision with Ne and Ar in a sample cell are simulated. The integral interference phase angles are computed under both homonuclear and non-homonuclear approximations. The results are perfectly satisfactory under the latter condition.