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. Author manuscript; available in PMC: 2013 May 15.
Published in final edited form as: Anal Chem. 2012 Apr 23;84(10):4513–4519. doi: 10.1021/ac300367p

Figure 1.

Figure 1

Single scan IRMPD MS/MS spectrum of the doubly protonated peptide cation, WAAAKAAAK, performed at a q=0.13 relative to the precursor for 7 ms at 60 W laser power. The MS/MS AGC target was set to 1 x 104 charges. The labeled peptides were mixed in ratios of 1:5:2:1.5:1:3. The black dots indicate isotopic-purity corrected theoretical ratios.