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Title: Momentum Transfer in Complex Plasmas: Results of Binary Collision Approach

Abstract

Momentum transfer in complex plasmas is investigated in a binary collision approximation assuming a Yukawa interaction potential between the charged species. Momentum transfer cross sections and rates are derived. Applications of the results are discussed.

Authors:
; ;  [1]
  1. Max-Planck-Institut fuer extraterrestrische Physik, D-85741 Garching (Germany)
Publication Date:
OSTI Identifier:
20726768
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 799; Journal Issue: 1; Conference: 4. international conference on the physics of dusty plasmas, Orleans (France), 13-17 Jun 2005; Other Information: DOI: 10.1063/1.2134620; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; ELECTRON COLLISIONS; ION COLLISIONS; MOMENTUM TRANSFER; PLASMA; POTENTIALS

Citation Formats

Khrapak, S.A., Ivlev, A.V., and Morfill, G.E.. Momentum Transfer in Complex Plasmas: Results of Binary Collision Approach. United States: N. p., 2005. Web. doi:10.1063/1.2134620.
Khrapak, S.A., Ivlev, A.V., & Morfill, G.E.. Momentum Transfer in Complex Plasmas: Results of Binary Collision Approach. United States. doi:10.1063/1.2134620.
Khrapak, S.A., Ivlev, A.V., and Morfill, G.E.. Mon . "Momentum Transfer in Complex Plasmas: Results of Binary Collision Approach". United States. doi:10.1063/1.2134620.
@article{osti_20726768,
title = {Momentum Transfer in Complex Plasmas: Results of Binary Collision Approach},
author = {Khrapak, S.A. and Ivlev, A.V. and Morfill, G.E.},
abstractNote = {Momentum transfer in complex plasmas is investigated in a binary collision approximation assuming a Yukawa interaction potential between the charged species. Momentum transfer cross sections and rates are derived. Applications of the results are discussed.},
doi = {10.1063/1.2134620},
journal = {AIP Conference Proceedings},
number = 1,
volume = 799,
place = {United States},
year = {Mon Oct 31 00:00:00 EST 2005},
month = {Mon Oct 31 00:00:00 EST 2005}
}
  • Momentum transfer in complex plasmas (systems consisting of ions, electrons, neutrals, and charged macroscopic grains) is investigated assuming an interaction potential between the charged species of the screened Coulomb (Yukawa) type. Momentum transfer cross sections and rates are derived. Applications of the results are discussed; in particular, we classify the possible states of complex plasmas in terms of the momentum transfer due to grain-grain collisions and its competition with that due to interaction with the surrounding medium. The resulting phase diagrams are presented.
  • The effect of the electron momentum distribution on the energy dependence of the ionization cross sections and the ratios of these cross sections, for the 2s and 2p electrons in an atomic L shell, is analyzed in the binary-collisions approximation. The electron states in the target atoms are described by the Slater and Roothaan--Hartree--Fock momentum wave functions and hydrogenic wave functions. The use of the real wave functions in the calculation of the ratio of ionization cross sections in the binary-collision approximation improves the agreement with experiment. The behavior of the ratio of ionization cross sections is explained by certainmore » features of the electron momentum distribution.« less
  • Binary collision rates for arbitrary scattering cross sections are derived in the case of a beam of particles interacting with a Maxwell-Boltzmann (MB) plasma, or in the case of two MB plasmas interacting at generally different temperatures. The expressions are valid for all beam energies and plasma temperatures, from the nonrelativistic to the extreme relativistic limits. The calculated quantities include the reaction rate, the energy exchange rate, and the average rate of change of the squared transverse momentum component of a monoenergetic particle beam as a result of scatterings with particles of a MB plasma. Results are specialized to elasticmore » scattering processes, two-temperature reaction rates, or the cold plasma limit, reproducing previous work.« less
  • The relaxation dynamics of vibrationally excited ground-state azulene molecules have been examined by picosecond transient absorption spectroscopy in a variety of different solvents including hexane, chloromethanes, methanol, CClF{sub 3}, Xe, and Kr. A high pressure optical cell was used to liquify gases for use as solvents and to change their density and temperature independently over the entire liquid density range. Experimental results indicate that the vibrational cooling rate is strongly solvent dependent, with cooling rates of approximately 20 ps in molecular solvents and approximately 150 ps in atomic solvents. Comparison of the rates in Xe and Kr at constant numbermore » density demonstrates the strong effect of solvent mass on energy transfer. The effect of solvent temperature on vibrational cooling is minimal, as is the effect of solvent density. The latter result is quite surprising in light of earlier experiments on simpler molecular systems, such as I{sub 2} in Xe, and predictions of isolated binary collision theories. An explanation is offered from large scale molecular dynamics simulations of the system. In effect, azulene forms an ordered Xe cluster'' with xenon atoms; the xenon number density normal to the azulene molecular plane is independent of solvent density.« less