Hello, I have a question on rf heating in Paul trap. There are papers which say that in a Paul trap, the ion cloud eventually comes to a state of thermal equilibrium with the background gas. And at the same time there is a concept of "rf heating" in these traps. I am slightly confused about it. If the ion cloud is coming to an equilibrium, then in what context do we talk of "rf heating"? I have read some papers on this issue but all seem to be too obscure on this particular issue. I would be glad if someone can please reply to this question. Thanks, Kushal.