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What halogen filling does
The halogen cycle :
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A
tungsten atom evaporates from the filament and "wants
to deposit itself on the bulb". |
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The
atom is "caught" by the halogen gas and forms
a molecule that no longer "wants to deposit itself
on the bulb". |
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When
this halogen/tungsten molecule gets near the very hot
filament, it decomposes breaking up into A tungsten atom,
that is deposited on the filament and "strengthens"
the filament at this place.
A halogen gas atom, that is back in the cycle to "capture"
a free tungsten atom |
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Thus,
the halogen cycle hinders the evaporation of the filament,
by catching the tungsten atoms and putting them back on
the filament. |
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