# plasma frequency in non-neutral plasma

Is it possible to see the oscillations with plasma frequency in a gas of particles of the same charge (not mixture of positive and negative charges)?

• Be a little careful in asking these short questions next time. Usually (not this time) they immediately end up in the low quality queue. – Abhimanyu Pallavi Sudhir Sep 29 '13 at 8:33

• @Gotaquestion - The Bohm-Gross dispersion relation (the one you cited), and for any other Langmuir-like oscillation, is only true if there is a restoring force in the plasma. The plasma frequency, $\omega_{pe}$, is derived by taking two sheets of oppositely charged particles and separating them. Then the equations of motion look like the SHO. If there are only one species of charged particles, then this type of oscillation will not occur, thus $\omega_{pe}$ $\rightarrow$ 0. – honeste_vivere Oct 24 '14 at 16:31