Axis BTA 2100D Operator's Manual Page 226

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MS/MS
You can do multiple reaction monitoring by adding lines of different parent ions
masses and different dissociation parameters. The limit is nine.
Unit Resolution Selected Ion Storage
Unit Resolution Selected Ion Storage (uSIS) is capable of isolating up to 9 ions with unit mass
isolation. This method is useful for those cases where the standard SIS window is too large.
Use uSIS when narrow mass ranges are required by your application. Allowed
storage windows vary up to 3u at m/z less than 80 and up to 14u at m/z 420 and
above. If larger ranges are needed, use the SIS option.
MS/MS/MS
MS
3
uses two parent ions for sequential dissociation. The additional dissociation
step can be used to increase selectivity of analyte versus background or for
additional structure information.
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