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. Author manuscript; available in PMC: 2022 Feb 18.
Published in final edited form as: Anal Chem. 2021 Nov 17;93(47):15728–15735. doi: 10.1021/acs.analchem.1c03652

Figure 1.

Figure 1.

Example of the ETD-PIP waveform in the frequency domain for the Protein G [M + 28H]+28 precursor at 767 m/z. The secular frequencies of the precursor and reagent ions are 109.5 and 394.5 kHz in the QLT, respectively.