No abstract

Negative corona discharge with impulses of current in the air is known long ago. Up to now impulses in electropositive gases were not observed. Negative corona'was researched in argon's flow by atmosphere pressure. The results were also determined stages of negative COIOM discharges existence and characteristics of CUIrent's impulses. 5PA35 About a Plasma Model of Positron Spur in a Substancet AB is known, wide application in physics and chemistry of a positron and pmitronium atom (Ps) has received a spur model formation of PB atom. In the present work t h e new piasma submissions about positron spur. originating during passing of positrons through subatance are offered. T h e evaluations of such characteristic parameters of positron *pur. as it lifetime and sizes are obtained. The kinetics of elementary processes in volume of spur is discussed aim. Spur is main concept of radiation chemistry and chemistry of pmitm nium atom and represents area of local excitation of substance. Uauaiiy, for want of consideration of a kinetics of elementary pmcin spur use s u b missions about one partial character of elementary sxcitatims of L medium (excited atoms. dmtron. ionic pair). However, in the present work Is shown, that under certain conditions spur exhibits a i s plasma pzoperties. An spur from charged particle;, for want of same conditione there is essential a Coulomb correlation between them. and pur as Lhe piasma-like subetance i s possible to consider. Such micropiasma of spur has not analogs among other kinds of plasmas, but, de;pite of small sizes (R = 0.01-1.0 mkm) it.k possible to consider it as plasma if is satisfied condition micrmcopic neutrdity of whole volume spur ( R L d here R-a spur sine, d -Debye length ). Is shown. that this condition is executed for unpolar liquids and dense gases for want la shown, that spur it is p-ibie to consider as weak ionized plasma in dense gases ( P = 100 atm, T= 300K) and umpoiar Liquids. Proceeding from the stated above plasma submissions it is pmsibie to understand the stability of spur: For the account of eiectraatatical forces ofpolarizatldn of a charge "my mobile electrons can not leave of spur volume and sdiabaticaliy follow slow movement of positive ions. In turn diffusion of poeitive ions in a medium will determine average life-time of spur. An _on as spur radius will become comparable t o a Debye radius in spur last breaks up for one period of plasma oscillation. From here we shaii receive that werage iife-time of spur for U"-polar Liquids and dense gases will be 1-10 nm. Thus. on our evaluations the time of formation make; one spur ib 0.01 ps with it an initial size 100-1000 However in process of a pmitron thermalhation on an extremity it of B path these separate spurs begin to be upe er imposed and.wiii dwivate short Cracks with sizes 1-10 mkm. Therefore further thermalizatiqn of positions will h a p pen in voiume of spur. T h e lifetime of spur makes 0.1-10 ns..?or this time are happening the following proc-: installation of a ther?*i.quilibrium among electrons o...