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Registered Member #54278
Joined: Sat Jan 17 2015, 04:42AM
Location: Amite, La.
Posts: 367
Does anyone know of a simple way to use readily available parts (ebay, etc.) to actually construct a photoelectric type apparatus that makes visible, a photo-emission of electrons? I am not speaking of an actual triggered spark gap, OR of the common demos with an electroscope, but a way to actually see an electrical 'corona' type discharge initiated by a light source striking the metal. Perhaps a blue ray frequency UV laser diode (I know this is 405nm which may not be energetic enough) or focused UVC anti-bacterial lamp striking a low work function metal (polished zinc??) If a pressure lower than atmospheric is required, then it should be easily obtainable with a hand pump or standard (high-school physics) type vacuum pump.
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
I think that an activated Zinc Sulfide screen would work, there are sellers on eBay, e.g. or you could scrape the 'phosphor' from inside a fluorescent tube or c.r.t. from t.v. or monitor.
Registered Member #54278
Joined: Sat Jan 17 2015, 04:42AM
Location: Amite, La.
Posts: 367
Sulaiman wrote ...
I think that an activated Zinc Sulfide screen would work, there are sellers on eBay, e.g. or you could scrape the 'phosphor' from inside a fluorescent tube or c.r.t. from t.v. or monitor.
Thanks, I ordered one for several uses I would have from the ebay description. Eventually, I would like to get an ionized region around the emitted particles--to actually make and demonstrate a UV-generated conductive region through the emissions. Finally through, I guess I am actually looking for a UV triggered SG, just to see the principle in application
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visible UV-triggered particle emission demonstration
