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. Author manuscript; available in PMC: 2015 Jun 1.
Published in final edited form as: J Am Soc Mass Spectrom. 2014 Apr 12;25(6):918–927. doi: 10.1007/s13361-014-0864-5

Figure 6.

Figure 6

(a) Average charge of ubiquitin ions formed from 25 mM (unless otherwise noted) acetate salt solutions from collision voltages 0 to 70 V. (b) Collisional activation of (U + H + 2TMA)3+ at 0 V (top) to form (U + H + TMA)2+ at 40 V (middle) and (U + H)1+ at 80 V (bottom). (*) indicates stable low abundance cluster ions at same m/z as precursor that are also isolated at 0 V.