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. Author manuscript; available in PMC: 2008 Aug 26.
Published in final edited form as: Anal Chem. 2007 Jan 15;79(2):477–485. doi: 10.1021/ac061457f

Figure 3.

Figure 3

Contour maps plotting the effect of activation qu-value and excitation voltage for collisional activation of an ET product ion ([M+2H]+•). Panel A displays the abundance of the intact ET product (the ion subjected to secondary activation); panel B plots the formation of an ETD-type product ion (c10) not produced directly by ETD; panel C displays formation of a CAD-type product ion (b8). Plotted to the right are three two-dimensional cross-sections (varying excitation voltage at fixed qu values of 0.15, 0.18, and 0.20) of this data. These cross-sections also plot the combined total product ion signal derived from ET, ETD and ETcaD. Note the total ion signal trace does not include the precursor signal. Because the ET precursor ion was not isolated, this signal begins at ~ 80% relative intensity – signal that can be attributed to c and z-type fragments generated directly by ETD.