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EARLIER UNKNOWN FUNDAMENTAL CHARACTERISTICS OF ELECTRON TRANSPORT AND HEATING IN SUBSTANCE UNDER THE FORCE OF ELECTRIC FIELD

VV I INT WORKSHOP ON MICROWAVE DISCHARGES FUNDAMENTALS AND I Int. Workshop on Microwave Discharges: Fundamentals and Applications

SV I INT WORKSHOP ON MICROWAVE DISCHARGES FUNDAMENTALS AND eptember 11-15, 2006, Zvenigorod, RUSSIA

EARLIER UNKNOWN FUNDAMENTAL CHARACTERISTICS OF ELECTRON TRANSPORT AND HEATING IN SUBSTANCE UNDER THE FORCE OF ELECTRIC FIELD

I.A. Boriev
Institute for Energy Problems of Chemical Physics (Branch) RAS, Chernogolovka, Russian Federation, e-mail: [email protected]

Recently we have performed a proper, statistical physics based, analysis of long known peculiarities for electron drift velocity in liquid rare gases. For the first time, both qualitative and quantitative explanations were given for observed effects of drift velocity saturation in high fields [1,3] and drift velocity increase at small addition of molecular impurity [2,3]. At that, we have revealed earlier unknown two fundamental properties for electron transport (drift) and heating under the force of electric field in mainly elastic scattering substance.

First, statistically correct relation of times of electron free path and electron transport impulse relaxation has been established. This most important relation is defined by a number of electron free path time required for relaxation of electron transport impulse. As is found, this number depends on the shape of electron flux scattered on atoms, that determines the force of electron elastic friction [1-3]. It is equal to ~16 in low fields for thermal electrons (isotropic flux), and decreases to ~4 in high fields for strongly forced transport heated electrons (uniform flux).

Second, it is discovered, that electron forced heating, which may reach in high fields the energy of rare gas atom excitation, leads to significant anisotropy of electron velocity distribution function: electron mean velocity in transport direction becomes ~3 times larger, than in the opposite one [1,3]. Hence, mean energy of such electrons differs ~9 times. This phenomenon, earlier leaved out of account, points out a very significant anisotropy of mean energy (temperature) for forced transport heated electrons in the substance.

The revealed properties of electron forced transport and heating are strictly substantiated by the methods of statistical physics for open dissipative systems.

References

  1. Boriev I.A. Khimicheskaya Fizika, 2003, 22, 80 (in Russian).

  2. Boriev I.A. Khimicheskaya Fizika, 2003, 22, 103 (in Russian).

  3. Boriev I.A. “New features of forced transport and heating dynamics of quasi-free electrons under electric field in dielectric medium”, 30th EPS Conference on CFPP, St. Petersburg, 7-11 July 2003, ECA Vol. 27A, P-2.185 (http://epsppd.epfl.ch/StPetersburg/PDF/P2_185.PDF).



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Tags: microwave, fundamentals, discharges, workshop