Monthly Archives: May 2015

Structural Characteristics and Equation of State of the Complex Plasmas

In this paper weakly and strongly non-ideal plasmas are considered. In both cases the equations of state for hydrogen and dusty plasmas were studied on the basis of effective potentials. In the first case the thermodynamic properties for hydrogen plasmas were studied by the method of effective potentials taking into account quantummechanical diffraction, symmetry and screening effects. For strongly non-ideal plasma or dusty plasma the equations of state were considered using radial distribution functions and effective interaction potential, which describes interactions of charged dust grains with dipole moments. (© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

Resonances in positron-hydrogen scattering in dense quantum plasmas

We have investigated the S-wave resonance states in positron-hydrogen system embedded in dense quantum plasmas using Hylleraas-type wave functions within the framework of the stabilization method. The effect of quantum plasmas has been incorporated using the exponential-cosine-screened Coulomb (modified Yukawa-type) potential. Resonance parameters (both position and width) below the Ps n = 2 threshold are reported as functions of plasma screening parameters.

Mode couplings and resonance instabilities in finite dust chains

Author(s): Ke Qiao, Jie Kong, Lorin S. Matthews, and Truell W. Hyde

Employing a numerical simulation, the normal modes are investigated for finite, one-dimensional horizontal dust chains in complex plasma. Mode couplings induced by the ion flow within the sheath are identified in the mode spectra and the coupling rules are determined. Two types of resonance-induced ...

[Phys. Rev. E 91, 053101] Published Fri May 08, 2015

Observation of external control and formation of a void in cogenerated dusty plasma

A void (i.e. the complete absence of macroscopic dust particles) can be generated in the bulk plasma region of a cogenerated dusty plasma with the help of a positively dc-biased ring electrode placed between two electrodes of dc discharge. This void region can then be dynamically controlled by varying the external positive bias voltage through the ring electrode.