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Thu, 31 Aug 2006 12:26:21 -0500 |
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Charlotte,
1. I think you have checked amplifiers with ion source turned off and they
had zeros.
2. It seems your 44 beam is very close to your 45 cup. Some 44 ions hit
the edge of 44 cup and reflect to 45 cup. The remedy is mass calibration.
Hope it will help.
Sergey.
--
Sergey Oleynik, PhD
Dept. Earth and Atmospheric Sciences
Purdue University
550 Stadium Mall Drive
West Lafayette, IN 47907
Phone: 765-494-3274
On Thu, August 31, 2006 11:20 am, Charlotte Lehmann wrote:
> I am wondering if anyone can suggest why the Mass45 background (BGD)
> value would be negative, and how to correct for this. I am also
> getting very depleted isotopic values to go along with the negative
> BGD value.
> --
> Charlotte Lehmann
> Research Technician
> Bates College
> Department of Geology
> 206A Carnegie Science Building
> 44 Campus Avenue
> Lewiston, ME 04240
> Phone: 207-786-6485
> FAX: 207-786-8334
>
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