Abstract
A time-dependent wavepacket theory for dynamic absorption spectroscopy is used to analyze the evolution of the transient absorption spectrum of nile blue following excitation with a 6 fs pulse. The femtosecond pump pulse creates nonstationary wavefunctions in both the ground and excited electronic states of the molecule. The absorption spectrum of these initial nonstationary states is expressed in terms of the Fourier transform of the time-dependent dipole matrix element between vibrational wavepackets moving on both the final and initial potential surfaces. The transient spectra observed for nile blue are successfully modeled using a one-dimensional system of displaced 590 cm −1 harmonic potential surfaces.
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