kb8tq at n1k.org
Fri Jun 9 19:52:35 EDT 2017
You can’t quite process a crystal at 300C, but you can get close.
> On Jun 9, 2017, at 7:38 PM, Neville Michie <namichie at gmail.com> wrote:
> My memory of high vacuum work is that you need to pump for 4 hours
> at 300C to remove the water monolayer from glass.
> On top of the that water monolayer is another water monolayer that comes off more easily,
> and on top of that another………..
> Neville Michie
>> On 9 Jun 2017, at 10:57 AM, Richard (Rick) Karlquist <richard at karlquist.com> wrote:
>> On 6/8/2017 5:08 PM, Bob kb8tq wrote:
>>> In this case hydrogen + oxygen (like from oxidized metal) goes to H20. You very much do
>>> not want water running around inside your crystal holder… Helium is inert.
>> Exactly right Bob. The 10811 guys used to go nuts
>> about keeping water out of their vacuum system.
>> There were certain temperatures known as "water
>> points" at which some water was released.
>> The retained water was in spite of the temperature
>> already being above 100 degrees C (boiling).
>> It has something to do with monolayers of
>> water molecules not boiling away.
>> Rick N6RK
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