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Issue 2, 2013
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Excited-state absorption and ultrafast relaxation dynamics of protoporphyrin IX and hemin

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Abstract

The transient evolution of protoporphyrin IX (PPIX) and hemin following the Soret band excitation was measured in the 410–600 nm spectral region with sub-picosecond time resolution. In PPIX the relaxation pathway was characterized in the femto- and picosecond time scale by two processes with time constants of 350 fs and ∼6 ps, describing the evolution of the system through internal Qy → Qx conversion and vibrational relaxation and cooling in the Qx state. The lifetime of the Qx state was found to be 10.4 ns by time resolved fluorescence measurements. In hemin, the ground state is completely recovered in tens of picoseconds through pathways involving CT and (d,d) states. The experimentally observed vibrational dynamics is mainly due to “hot” ground state transitions.

Graphical abstract: Excited-state absorption and ultrafast relaxation dynamics of protoporphyrin IX and hemin

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Article information


Submitted
09 Jul 2012
Accepted
24 Sep 2012
First published
01 Oct 2012

Photochem. Photobiol. Sci., 2013,12, 348-355
Article type
Paper

Excited-state absorption and ultrafast relaxation dynamics of protoporphyrin IX and hemin

A. Marcelli, I. Jelovica Badovinac, N. Orlic, P. R. Salvi and C. Gellini, Photochem. Photobiol. Sci., 2013, 12, 348
DOI: 10.1039/C2PP25247C

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