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Stable Isotope Geochemistry

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Stable Isotope Geochemistry <[log in to unmask]>
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Prof. Dr. Hilmar Förstel <[log in to unmask]>
Date:
Wed, 15 Nov 2006 17:07:38 +0100
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Stable Isotope Geochemistry <[log in to unmask]>
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Dear colleague,

this seems (or must be) sputtering, which is also used to coat windows or other materials. In your source you have a strong electrical field. If you generate ions they are accelerated in this field and hit metal surfaces they make a crater of the material they hit. This material is then moving as a vapour in your system (even Pt e.g.)and settle down at other parts. In nearly each source one may observe this phenomenon, yours  may have been  as longlasting or extremely intensive that you could have a mining activity afterwards. (sorry)
The danger is that this metallic film isnconductive and will disturb the insulation of the source plates.
Best regards Hilmar Förstel

>Dear listmembers,
> 
>
> 
>After measuring hydrogen on our Delta Plus XP, we saw strange layers on the source housing and the source plate. As you can take from the pictures (see web page below) there is a grey to blue layer on the metal, looks like it was powder-coated. We tried to rub it away with a cotton towel and some methanol, which still leaves a shadow behind.
> 
>
> 
>The source itself looks fine without showing any unusual spots. 
> 
>
> 
>We are asking ourselves two questions:
> 
>1) What might this layer consist of?
> 
>2) How did the material reach this part of the source and why did it precipitate in this special manner?
> 
>
> 
>Thanks for any comments
> 
>
> 
>Regards Thomas
> 
>
> 
>http://www.dshs-koeln.de/biochemie/rubriken/08_analytik/08_IRMS_061116.html
> 
>
> 
>
> 
>Thomas Piper
> 
>Institut für Biochemie
> 
>Deutsche Sporthochschule Köln
> 
>Carl-Diem-Weg 6
> 
>50933 Köln
> 
>+49 221 4982 5060
> 
>
>-----------------------------------------
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