Linear and nonlinear optical responses in bacteriochlorophyll a

Sugisaki, M., Fujii, R., Cogdell, R.J. and ashimoto, H.; (2008) Linear and nonlinear optical responses in bacteriochlorophyll a. Photosynthesis Research, 95(2-3), pp. 309-316. (doi: 10.1007/s11120-007-9266-x)

Abstract

Nonlinear optical responses of bacteriochlorophyll <i>a</i> (BChl <i>a</i>) were investigated by means of the three-pulse four-wave mixing (FWM) technique under the resonant excitation into the <i>Q</i> <i>y</i> band. The experimental results are explained by a theoretical model calculation including the Brownian oscillation mode of the solvent. We have determined the spectral density, which is the most important function with which to calculate optical signals. The linear absorption spectrum can be reproduced fairly well when the vibronic oscillation modes of the solvent together with those of BChl <i>a</i> are properly taken into consideration. The FWM signal was also calculated using the spectral density. It was found that a simple two-level model could not explain the experimental result. The effect of the higher-order interactions is discussed.

• Item Type: Articles
• Additional Information: Embargo on full text until October 2008
• Keywords: Nonlinear spectroscopy, Four-wave mixing, BChl a, Brownian oscillator model, Spectral density
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Cogdell, Professor Richard
• Authors: Sugisaki, M., Fujii, R., Cogdell, R.J., and ashimoto, H.;
• Subjects: Q Science > QD Chemistry
• College/School: College of Medical Veterinary and Life Sciences > School of Molecular Biosciences
• Journal Name: Photosynthesis Research
• ISSN: 0166-8595
• Published Online: 10 October 2007