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IR transient kinetic traces of Trp-Z34C obtained at two representative probing frequencies, 1630 cm-1 (blue) and 1664 cm-1 (red). The smooth lines are global fits of these traces to a three-exponential function plus an offset with the following time constants: 7 ns, 150 ns, and 2.0 μs. Shown in the inset are the same data with a logarithm time axis.
