It sounds like you need to dip a corner of the device in liquid nitrogen
and allow the metal to evaporate and condense in the cold corner.
Or is it sublimation.
I do not know how long it would take.
cheers, Neville Michie
On 13/01/2011, at 11:31 PM, Chuck Harris wrote:
I suppose that would be possible if a C beam standard worked like a
rubidium
reference, but alas, they are different in virtually all respects.
Think of the C beam as having a small kettle full of cesium that is
put
on a low simmer. The kettle keeps the cesium molten, and bubbling
up minute
amounts of cesium vapor.
How are you going to refill the kettle when it lives in the middle of
a hard vacuum chamber? The best you could do with your technique
(assuming
it is even possible) is to coat the walls of the vacuum chamber
with cesium...
Kind of like trying to fill the gas tank by hosing the car down
with gasoline.
Besides, if HP can be believed, the kettle never runs out of cesium
before
the receiving end of the tube gets completely choked on waste
cesium metal.
That waste cesium needs to be removed, and the electron multiplier
needs to
be restored, at a minimum.... and the ion pump is probably full up
too.
-Chuck Harris
Neville Michie wrote:
It may not be necessary to open a tube to renew the supply of an
alkali
metal.
I remember an experiment where an incandescent light bulb was dipped
into molten sodium chloride in an iron vessel.
The filament was run and a voltage between the filament and the iron
vessel caused sodium ions to migrate through the glass
into the bulb. Sodium accumulated in the bulb.
It is obviously a slow process, but then you did not need to put
much Cs
in the bulb.
Why not use it to recharge an alkali metal lamp?
cheers, Neville Michie
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