Photon echo spectroscopy of porphyrins and heme proteins: effects of quasidegenerate electronic structure on the peak shift decay

The Journal of Chemical Physics
Byung Moon ChoRalph Jimenez

Abstract

Three pulse photon echo peak shift spectroscopy and transient grating measurements on Zn-substituted cytochrome c, Zn-tetraphenylporphyrin, and Zn-protoporphyrin IX are reported. The effects of protein conformation, axial ligation, and solvent are investigated. Numerical simulations of the peak shift and transient grating experiments are presented. The simulations employed recently derived optical response functions for square-symmetric molecules with doubly degenerate excited states. Simulations exploring the effects of excited-state energy splitting, symmetric and asymmetric fluctuations, and excited-state lifetime show that the time scales of the peak shift decay in the three-level system largely reflect the same dynamics as in the two-level system. However, the asymptotic peak shift, which is a clear indicator of inhomogeneous broadening in a two-level system, must be interpreted more carefully for three-level systems, as it is also influenced by the magnitude of the excited-state splitting. The calculated signals qualitatively reproduce the data.

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Citations

Mar 23, 2011·The Journal of Physical Chemistry. a·Eric R Smith, David M Jonas
Jan 22, 2009·The Journal of Chemical Physics·N ChristenssonT Pullerits
Aug 17, 2010·The Journal of Chemical Physics·A Ajdarzadeh OskoueiM Chergui
Jan 12, 2008·Journal of Pharmaceutical Sciences·Tim J Kamerzell, C Russell Middaugh
Feb 3, 2007·Physical Chemistry Chemical Physics : PCCP·Benjamin DietzekArkady Yartsev
Feb 6, 2017·The Review of Scientific Instruments·Dmitry BaranovDavid M Jonas
Jul 3, 2017·The Review of Scientific Instruments·Austin P SpencerDavid M Jonas
Feb 26, 2008·The Journal of Physical Chemistry. a·Joel Gilmore, Ross H McKenzie
Feb 7, 2008·The Journal of Physical Chemistry. a·Oliver SchalkAndreas-Neil Unterreiner
Apr 25, 2007·The Journal of Physical Chemistry. B·Benjamin DietzekArkady Yartsev

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