2009/9/10 Abd ul-Rahman Lomax <[email protected]>: > At 03:45 PM 9/9/2009, you [Jed] wrote:
>> Ah. CR-39 is opaque. You mean looking around it, from another angle. > > No. There are different kinds of CR-39. It's true, I've never seen a CR-39 > chip as used in this field, personally, See in top photograph here http://www.earthtech.org/CR39/A_B/reportAB.html the cathode wire bearing part with a "1" and an "A" scratched in it. Doesn't look very opaque to me, at least not in the visible spectrum (Jed, can you provide refs showing opaque CR-39 used in this field?) Suggestion, if you want to video the cathode, better look at it from the side, I gather deposits can form on the bottom. Videoing through the CR-39 seems a good idea to me, if nothing else it will show how the plating, dendritic or spongy, forms vs time (hard dendritic plating is a requirement for pit forming it seems). You could drill a round window through the flat side wall of the cell, and press the cathode bearing CR-39 against the wall via e.g. a PTFE gasket around the hole to prevent leaks. Note such an arrangement also allows "PACA" experiments by interposing a few microns mylar film, plus, I suggest, a thin layer of air guaranteeing no electrolyte vs CR-39 chemical interaction whatsoever while only negligibly slowing down energetic particles. Michel
