PHYSICS: FINDINGS FROM H.B. NERSISYAN AND CO-AUTHORS BROADEN UNDERSTANDING OF PHYSICS
Science Letter
August 5, 2008
According to recent research published in the journal Physical
Review E, "The electric microfield distribution (MFD) at a neutral
point is studied for two-component (TCP) electron-ion plasmas using
molecular-dynamics simulation and theoretical models. The particles are
treated within classical statistical mechanics, using an electron-ion
Coulomb potential regularized at distances less than the de Broglie
length to take into account quantum-diffraction effects."
"Corrections to the potential-of-mean-force exponential (PMFEX)
approximation recently proposed for the MFD at an impurity ion in a
strongly coupled TCP [Nersisyan et al., Phys. Rev. E 72, 036403 (2005)]
are obtained and discussed. This has been done by a generalization
of the standard Baranger-Mozer and renormalized cluster expansion
techniques originally developed for the one-component plasmas to the
TCPs. The results from this theoretical model are compared with those
from molecular-dynamics simulations. In particular, for a strongly
coupled TCP with an ionic charge Z> 5 the agreement with numerical
simulations is excellent," wrote H.B. Nersisyan and colleagues (see
also Physics).
The researchers concluded: "For still increasing coupling we
furthermore found that the PMFEX scheme becomes insufficient to
predict the MFD at a neutral point, while its improved version quite
well agrees with the simulations."
Nersisyan and colleagues published their study in Physical Review E
(Renormalized cluster expansion of the microfield distribution in
strongly coupled two-component plasmas. Physical Review E, 2008;77(5
Part 2):6409).
For additional information, contact H.B. Nersisyan, Institute
Radiophys & Electrical, Division Theoret Physics, Alikhanian Bros
St. 1, Ashtarak 378410, Armenia.
The publisher’s contact information for the journal Physical Review
E is: American Physical Society, One Physics Ellipse, College Pk,
MD 20740-3844, USA.
From: Emil Lazarian | Ararat NewsPress
