Attractive Potential around a Thermionically Emitting Microparticle

Details Attractive Potential around a Thermionically Emitting Microparticle Attractive Potential around a Thermionically Emitting Microparticle

2003-10-31

arxiv.org/abs/physics/0310162v3

Physical Review Letters; 23 Jan. 2004; vol.92, no.3, p.035002/1-4

Physics

Plasma Physics

3 figures. To appear on Physical Review Letters

Scientific paper

10.1103/PhysRevLett.92.035002

We present a simulation study of the charging of a dust grain immersed in a plasma, considering the effect of electron emission from the grain (thermionic effect). It is shown that the OML theory is no longer reliable when electron emission becomes large: screening can no longer be treated within the Debye-Huckel approach and an attractive potential well forms, leading to the possibility of attractive forces on other grains with the same polarity. We suggest to perform laboratory experiments where emitting dust grains could be used to create non-conventional dust crystals or macro-molecules.

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