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SIS mode in ion trap

Posted: Wed Sep 25, 2013 6:31 am
by allene
Hi,
I'm analyzing organophophorous pesticide by Varian saturn ion-trap GC-MS. Amazingly, 4 pesticides have lower signal-to-noise in SIS mode than TIM mode. For other pesticides sensitivity increases (2-30 fold).

Any help?
Thanks a lot.