Ghosts, it seems, do not have trouble being unstable. Their inability to hold on to their electrons explains why sometimes they leave a trail of ectoplasmic residue. Their weak cohesion is what allows them to move through solid objects. So ghosts have a negative electrical charge. If you place a positive magnet near a negative magnet, the two will attract.
Protons are positive .
The proton pack, developed by Dr. Egon Spengler, seperates only protons from atoms and fires them in a long golden stream of concentrated positive charge. The proton beam wraps around the ghost, holding it tight, forming a stable, low-energy entity. Of course, something must be done to keep the ghost from flying away when the proton beam is turned off. That is what ghost traps are for. It, like the proton pack, creates a field of protons to hold the ghost.