[time-nuts] HP 5071A Electron Multiplier of Cesium Beam Tube

J. Forster jfor at quik.com
Tue Sep 8 21:50:26 UTC 2009


Is it REALLY a mass spec? After all, it only detects a single ion, like a
He leak detector. The He units can be tuned for He3 or He4

-Jo0hn

=================


> Mark Sims wrote:
>> At least the cesium ions don't have to travel through a maze of twisty
>> passages,  all alike...
>>
>>
>> ----------------------------------------
>> Oh Plugh!
>
> Just to be perfectly clear, the cesium (caesium) atoms is neutral as
> they pass through the A-magnet, microwave interigations, C-field and
> B-magnet. It is only when they hit the masspectrometer wire that they
> get ionized... and that current is was is measured as beam current.
>
> If the the atoms was ionized from start, they would react much more
> agressively to magnetic fields and would be easier to detect as well...
> the whole physical package would be quite different.
>
> Just look at mercury ion standards...
>
> Cheers,
> Magnus
>
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