Penta Quadrupole Instruments

The concept of the triple quadmpole instrument may be expanded by adding an-otha- RF-only quadmpole and a third mass-analyzing quadmpole to build a QqQqQ instrument. The penta quadmpole represents one of the rare tandem-inspace concepts to achieve MS. A commercial penta quadmpole instmment has once been offered by Extrel, but remained fairly exotic. Nonetheless, the penta quadmpole instmment may serve as a versatile tool for the study of gas phase ion chemistry and in particular ion-molecule reactions [99-102]. For the latter application the effective spatial separation of the zone with neutral reagent from that of preparation of the /n/z-selected precursor ion presents a clear advantage over tandem-in-time concepts. 

Product ion, define m-i no scan, select m-i metastable or CID scan up to to collect its fragments 

Precursor ion, define m2 scan from m2 upwards to cover potential precursors metastable or CID no scan, select m2 

Constant neutral loss, define n scan desired range metastable or CID scan range shifted by Am to low mass 

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