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. Author manuscript; available in PMC: 2013 Feb 7.
Published in final edited form as: Anal Chem. 2012 Jan 12;84(3):1533–1539. doi: 10.1021/ac203210a

Figure 1.

Figure 1

A schematic of the LTQ Velos Pro (ThermoFisher, San Jose, CA). To implement fHCD, q00 was replaced with an octopole and a DC voltage was placed on the exit lens downstream from the s-lens. Ions are isolated in the ion trap sent back to q00 (70 mtorr) for dissociation and then fragment ions are sent back to the ion trap for subsequent mass analysis.