ULTRAFAST PHOTOPHYSICS OF SIMPLE AROMATIC CHROMOPHORES
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Date
2012
Journal Title
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Publisher
Ohio State University
Abstract
It is known that the photophysical properties ofchromophores is decisively conditioned by the existence of $\pi\sigma^*$ transitions with repulsive character, in the vicinity of the characteristic bright $\pi\pi^*$ absorptions. The interplay between these two types of states triggers a complex dynamics that takes place in the femto-picoseconds scale., nderline{\textbf{302}}, 1693, 2003.} Our group is interested in understanding the ultrafast relaxation mechanisms involving $\pi\sigma^*$ surfaces in a set of isolated aromatic chromofores including: aniline, indole, phenol and pyrrole. In the research carried out, the dynamical signature of the $\pi\sigma^*$ states has been tracked directly on the parent molecules photoexcited in a broad range of their near UV absorption specta, by multiphoton delayed ionization at several wavelengths. For the studied molecules, the work provides a detailed view on the relaxation pathways available, while permits to relate their photophysical behavior with the relative location of the $\pi\sigma^*$ and $\pi\pi^*$ states.
Description
Author Institution: Departamento de Quimica Fisica, Facultad de Ciencia y Tecnologia, Universidad del Pais Vasco (UPV-EHU), Ap. 644, E-48080 Bilbao, Spain