Questions about plasma?

Imagine if you were to heat liquid mercury until it reaches a plasma state. Would it be possible to completely separate the free electrons (ions) from the positively charged nuclei (cations)? Next, how would a pure ion plasma react to the presence of (a) an electrical field and (b) a magnetic field? Also, how would the pure cation plasma react to the presence of© an electrical field and (d) a magnetic field? Thanks. Brian Ghilliotti