Stochastic simulation of thermoemission from surfaces of dusty grains

A. L. Bondareva
2005 AIP Conference Proceedings  
The thermoemission from dusty grains surfaces is necessary to take into account when processes in dusty plasma are simulated. The thermoemission of electrons can change temperature of electron part of plasma, typical electron velocity and others plasma properties. The kinetic distribution functions of secondary electrons from velocity and distance from dusty grain are calculated. The paper deals with stochastic simulation of plasma-surface interaction processes such as thermoemission and
more » ... emission and secondary emission of electrons, emission of adatoms, elastic and inelastic reflecions of plasma particles from dusty grains surfaces, ions and electrons penetrations into dusty grains. All these processes not only change dusty grains surfaces behaviour but also promote to plasma pollution and change plasma properties. Study of these processes is necessary for microelectronics, nanotechnology, cosmophysics and gas discharges. Special attention is paid to thermoemission. The model is supplement with selfconsistent three dimensional kinetic code of processes in dusty plasma [1] [2] [3] [4] . Note, that model presented in this paper has not self-consistency, dusty charge, size, temperature and electrostatic potential are supposed constants. This work will be introduced into main object-oriented 3D3V kinetic dusty plasma C++ code SUR-Dust [1-4] as its part. Change dusty charge, size, temperature and electrostatic potential also as change of plasma parameters (such as temperatures and densities of plasma components and others) take place only in main code and only main code is selfconsistent [1-4]. Simulation of processes on dusty grains surface is based on kinetic theory, Brownian motion model and stochastic analogues methods. The Leontovich equation is associated with the brownian motion model and Kramers problem. Emission under the influence of ions and electrons is described in terms of jump like Markov processes. Thermoemission and emission of adatoms from surface are simulated by diffusion Markov processes [5].The equation for thermoemission of electrons can be presented as follows: CP762, Rarefied Gas Dynamics: 24 th International Symposium, edited by M. Capitelli © 2005 American Institute of Physics 0-7354-0247-7/05/$22.50 Report Documentation Page Form Approved OMB No. 0704-0188 Public reporting burden for the collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for Information Operations and Reports, 1215 Jefferson Davis Highway, Suite 1204, Arlington VA 22202-4302. Respondents should be aware that notwithstanding any other provision of law, no person shall be subject to a penalty for failing to comply with a collection of information if it does not display a currently valid OMB control number.
doi:10.1063/1.1941638 fatcat:wplqfrqlavhnhod22ao4rmidby