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Bohm criterion for complex plasmas which are composed of electrons, negative and positive ions as well as dust grains is investigated with Sagdeev potential, taking into account the self-consistent dust charge variation. The numerical solutions show that the positive ion and dust Bohm velocities increase with the growth of the dust density, while both of them decrease with the growth of negative ion...
Taking into account the self-consistent dust charge variation, we use a Sagdeev potential approach to numerically investigate the effects of negative ions on the dust-acoustic soliton in negative-ion-contained dusty plasmas. It is shown that only the negative potential soliton can exist in the complex plasmas. Also, the presence of the negative ions can significantly reduce both lower and upper critical...
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