Electron density stratification in two-dimensional structures tuned by electric field

A new kinetic instability which results in formation of charge density waves is proposed. The instability is of a purely classical nature. A spatial period of arising space-charge and field configuration is inversely proportional to electric field and can be tuned by applied voltage. The instability has no interpretation in the framework of traditional hydrodynamic approach, since it arises from modulation of an electron distribution function both in coordinate and energy spaces. The phenomenon can be observed in thin 2D nanostructures at relatively low electron density.Comment: 4 pages, 2 figure

Empirical relations for moving striations

research notesThe theory of moving striations in positive columns is providing difficult to develop accurately on a quantitative basis (Watanabe and Oleson 1955, Walsh 1957), because of the complexity of the phenomena and because the oscillations have large amplitude and require a non-linear theory. It is therefore of some interest to seek further guidance from data found experimentally, and to look for empirical relations between the quantities involved and attempt to account for these in the first instance on rather general grounds

Ion Acoustic Wave Dispersion in a Highly Ionized Argon Plasma In a Magnetic Field.

The article of record as published may be found at http://dx.doi.org/10.1063/1.1691809USDO

Use of Langmuir Probes in Low-Pressure Rare Gas Plasmas

The article of record as published may be found at http://dx.doi.org/10.1063/1.1692049USDO

Experimental Study of Tonks-Dattner Resonances in Rare-Gas Plasmas

The article of record as published may be found at http://dx.doi.org/10.1063/1.1657230Tonks-Dattner resonances were studied in active discharges of neon, argon, and xenon in the milliTorr pressure region where self-excited moving striations are also present. The observed resonance peaks are fewer and broader than have been reported for mercury vapor discharges. The broadening is considerably greater than expected from Landau damping and Coulomb collisions and is attributed to electron density variations associated with moving striations. Direct measurements of electron densities and electron temperatures under resonance conditions permit comparison with the theory of Nickel, Parker, and Gould with no adjustable parameters. The agreement is satisfactory for argon and xenon but the high operating pressure required for stable operation of the neon plasma invalidates the use of the free fall hypothesis and the experimental resonance frequency peaks in this case lie appreciably above the predictions of the theory.U. S. Office of Naval ResearchUnited States Atomic Energy CommissionUnited States Atomic Energy Commission under Contr. AT(30-1)328