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220 and 503 isotopes

Discussions about GC-MS, LC-MS, LC-FTIR, and other "coupled" analytical techniques.

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220 and 503 isotopes

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BCBC
Any thoughts on why 220 and 503 would be a bit high, out of Agilent's acceptance range? Happens mostly with 220 and with multiple ion sources.
Thank you.

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gpronger
I assume that this is one of the Agilent bench top mass-specs. If so, try narrowing the peak widths a bit to see if that helps.

Greg
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