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10 G. ROBERTS
Figure 1.4. Experimental and theoretical femtosecond spectroscopy of IBr
dissociation. Experimental ionisation signals as a function of pump-probe time
delay for different pump wavelengths given in (a) and (b) show how the time
required for decay of the initally excited molecule varies dramatically according to
the initial vibrational energy that is deposited in the molecule by the pump laser.
The calculated ionisation trace shown in (c) mimics the experimental result
shown in (b).