Crossover frequencies in multicomponent plasmas with negative ions

Abstract

A simple model of plasma with two positive and one negative ionic species is used to study the effect of negative ions on the crossover frequencies in a multicomponent plasma. Both qualitative and quantitative results show very interesting features of the existence and behavior of crossover frequencies, especially when the negative ion mass has a value intermediate to the values of the two positive ion masses.

On the study of instability of ion-acoustic waves in relativistic plasma: Unbounded and bounded

“…In their experiments negative ion plasma are produced by introducing a small amount of SF 6 gas into a single-ended Q-machine plasma. The density ratio of negative SF 6 Ϫ to positive K ϩ ions, n Ϫ /n ϩ is controlled continuously in the range up to 0.9999. They investigated the effects of negative ions on the characteristic of typical plasma waves and instability, i.e., electron plasma waves, ion waves, electrostatic ion-cyclotron wave instability, and drift instability.…”

Phenomena in gases and plasmas with negative ions

“…Согласно [100] в случае пучка с малой плотностью частиц должна развивать-ся пучковая неустойчивость, а для плотного пучка -бунемановская. Неустойчивость тангенциального разрыва (Кельвина -Гельмгольца) в плазме с отри-цательными ионами исследовалась в [108], распро-странение электромагнитных волн в такой плазме -в [109][110][111][112]. Изучено также влияние отрицатель-ных ионов на стимулированное бриллюэновское [113,114] и рамановское [115] рассеяние электро-магнитных волн в плазме.…”

On the dispersion law of low-frequency electron whistler waves in a multi-ion plasma

“…It is well known that the peculiarities of the wave dispersion laws in the low frequency range are essentially different for a single ion plasma or a multi-ion species plasma (Hines, 1957;Buchsbaum, 1960;Yakimenko, 1962;Gintzburg, 1963;Smith and Brice, 1964;Gurnett and Burns, 1968;Das and Uberoi, 1972;Mamun et al, 2004Mamun et al, , 2005, and references therein). In the latter case, the main feature for plane waves is the appearance of cutoff frequencies in the domains of the ions' gyrofrequencies and of resonance frequencies, depending on their polarization sense.…”