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. Author manuscript; available in PMC: 2015 Apr 8.
Published in final edited form as: J Phys Chem B. 2014 Apr 18;118(28):7799–7805. doi: 10.1021/jp411901m

Figure 2.

Figure 2

2D IR spectra of the histidine amide I′ vibrator in the His dipeptide measured at different pH values and waiting times, as indicated. The dashed line in each case indicates the peak position at zero waiting time.