I'm looking for a moment when I remember Scotty uttering the words - I think - "Ion Drive" while looking at a screen (or Kirk) in astonishment, or something in that vein.
I found these clips of dialogue on the bridge (near the end of this short video mostly about Dr. Marc D. Rayman, Chief Propulsion Engineer, NASA JPL, starting at about 01:55) from the episode Spock's Brain, but they don't seem to be sufficiently astonished, and they say "Ion Propulsion" rather than Ion Drive.
There is a distinction between the two terms in Memory Alpha that I don't understand.
But what I really need is a clip, or a GIF or some evidence of this moment.
Does it exist, or have I embellished upon it over the decades?