we run a Delta V plus in Dual Inlet mode for CO2. We had a pre-vaccum pump failure (Pfeiffer Duo blowed themself off). After installing a new pump and new Pirani gauge standard deviations are bad (0.2 18O in a zero test). The peak shape is bad - no flat plateau in the middle cup, flanks are not very steep. The peak shape of m45 in the middle cup looks more like Gaussian chromatography peak instead.
I tried nearly every focus parameter but shape always remains that way.
=> Any idea what parameter will influence peak shape most?
(and yes: the source is dirty...not cleaned for 2 years or so with several blown filaments due to switched off helium and the pump failure that released some oil vapor; so I suspect this is already the answer to my question...get it cleaned?)
Dr. Robert van Geldern
GeoZentrum Nordbayern / Applied Geosciences
University of Erlangen-Nuremberg
91054 Erlangen, Germany
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