Hello all, I built an expansion cloud chamber and noted that an electrostatic field was needed to see the ionizing radiation. I know this is needed to prevent recombination of the ions and their free electrons. However, I built a diffusion cloud chamber a while ago that called for no electric field what so ever, and it still functioned perfectly. Does anyone know why diffusion cloud chambers do not need an electric field to delay recombination? What in a diffusion cloud chamber prevents recombination? Thanks!