Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 123, Issue 4, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1948383
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A unified description is presented of sequential and coherent contributions to optical transient absorption measured by femtosecond pump-supercontinuum probe spectroscopy. All inherent transient terms are taken into account. The coherence spike seen during pump-probe overlap is thereby decomposed into its components. The method is demonstrated with rhodamine 110 in methanol. Pure homogeneous dephasing times are obtained from a simultaneous fit of all pertinent measurements. Vibronic structure in the coherence spectrum is assigned to stimulated Raman scattering between vibrational levels in the first excited electronic state. The time-zero spectrum for stimulated emission and the solvation relaxation function are also obtained. (C) 2005 American Institute of Physics.
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