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- W89742761 abstract "The experimental researches of the single dust granule spin in conditions of the stratified glow discharge are carried out. The new technique of the angular velocity measurement by means of the coordinate tracing of light scattered by the hollow transparent particle is offered. The registered angular velocity turned out to be about 1-2 orders higher than the ones observed earlier. It depends on the particle individual peculiarities. The linear law dependence of the angular velocity on discharge current is found out. The mechanism of the single particle rotation is described. The numerical estimations agree with experimental data. each dust grain is caused by intensive fluxes of electrons and ions recombining on the particle surface. Also dust particles intensively interact with the neutral component in laboratory plasma. This leads to the particle cooling and to attenuation of its movement. Both external force fields and plasma particles fluxes affect the dust grain and cause its onward, oscillatory and rotary movement. The grain rotation (spin) was observed for the first time in (7). The rotation of the dust grain around its center of inertia is interesting for a number of reasons. First, the spin is connected to the plasma flux onto the dust particle surface. This allows to measure the charge by the contactless optical techniques (8). Second, the charged spinning particle has a magnetic moment, so there is a possibility for studying of magnetic properties of the dust component. For example, investigations (9) with grains, having intrinsic magnetic moments, have indicated a number of new phenomena: a modification of levitation conditions; a particles agglomeration in an external magnetic field. Third, the spin examination is necessary for the properly understanding of dusty plasma behavior in the external magnetic field (10-17). Under certain conditions the total spin momentum of all dust particles S may exceed the impulse momentum L of dust structure rotating in the magnetic field (8). In addition, this problem has the astrophysical applications." @default.
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- W89742761 date "2009-01-01" @default.
- W89742761 modified "2023-09-26" @default.
- W89742761 title "Macrospin of the Dust Granule" @default.
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