Slam Dunk!

After purchasing the upgraded tech, slam a ghost directly into the trap. After purchasing the Slam Dunk Trapping for $18,000, head for any trappable ghost. After getting it's resistance to Red give it a slam into a wall or ceiling to knock it out, use the slam feature to knock it into the trap. The easiest way to do this was slam it onto the floor next to the trap, then slam it again, heading for the trap. You wont get it stuck in the trap's beam then; as it doesn't count for the achievement. After a few tries you should be able to get it.