Use UV-C lamp to dissociate D2 molecules?

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Sven Andersson
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Joined: Mon Dec 02, 2013 4:46 pm
Real name: Sven Andersson

Use UV-C lamp to dissociate D2 molecules?

Post by Sven Andersson »

Anyone can buy UV-C lamps with a wavelength of 254 nm. Now, the energy to dissociate molecular hydrogen to atomic hydrogen is 4.52 eV, which corresponds to a wavelength of 274 nm. So a UV-C lamp should do the trick. The question is how efficiently? Cross sections? The easiest way to get an answer may be to try.

Here's my setup for producing deuterons: UV-C (the bare lamp should be inside the reaction chamber filled with D2 gas) to dissociate the D2 and at the same time electron bombardment from a heated filament cathode (and a voltage of several kV between anode and cathode) and alpha particles from Am-241 buttons, that I scavenged. Should be reasonable population of deuterons then.

Pressure? I will try with 1-10 Pa, and then upward to 100 Pa and higher and see what happens. If anything.

Comments?

Anyone in Europe who can sell me deuterium gas? Or in the US?
John Futter
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Real name: John Futter
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Re: Use UV-C lamp to dissociate D2 molecules?

Post by John Futter »

Sven
Yes you can disassociate the h2 to h but it is not ionised
I gave you the first ionisation energy in my previous answer.
Yes electrons with a few tens of volts of energy will ionise your hydrogen. No amount of UVc will ionise it. If it did we would have one hell of a pink sky above us.
Please stop flogging this dead horse
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