Re: UV nail lamps for EPROM

The Phantom <phantom@xxxxxxx> wrote:

[... very good info on UV]

Thanks for posting this information, Phantom.

I have a question. I notice that silver chloride turns black when
exposed to the light from ordinary office flourescent lights.

This reaction occurs when a UV photon forces a chlorine ion to give
up an electron, which then converts a silver ion to a metal atom.
The metal absorbs visible light and appears black. The reaction is
quite strong with only two overhead lights. Here is a description:

2AgCl + 2UV --> Ag(s) + Cl2(g)

The same reaction occurs outdoors in sunlight. Since the short wave
UV cannot penetrate ordinary glass, I assume the UV in this reaction
is long wave UV.

However, manufacturers of flourescent lights, such as GE, insist
that no UV escapes from their product. But obviously a great deal
does escape.

Do you have any idea how the UV gets through the phosphor coating?

Regards,

Mike Monett
.

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