Ultrafast polarization-modulation transient spectroscopy to study electronic excited state dynamics in biological molecules

Ioanna A. Gorbunova; Nikolai O. Bezverkhnii; Maxim E. Sasin; Idris M. Gadzhiev; Daria A. Gorbenko; Oleg S. Vasyutinskii

doi:10.1117/12.2567532

20 August 2020 Ultrafast polarization-modulation transient spectroscopy to study electronic excited state dynamics in biological molecules

Ioanna A. Gorbunova, Nikolai O. Bezverkhnii, Maxim E. Sasin, Idris M. Gadzhiev, Daria A. Gorbenko, Oleg S. Vasyutinskii

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Proceedings Volume 11497, Ultrafast Nonlinear Imaging and Spectroscopy VIII; 1149713 (2020) https://doi.org/10.1117/12.2567532
Event: SPIE Optical Engineering + Applications, 2020, Online Only

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Abstract

A novel polarization-modulation transient method has been developed for studying fast anisotropic relaxation in electronic excited states of polyatomic and biologically relevant molecules under excitation with femtosecond laser pulses. The method is based on the modulation of pump beam polarization with a photo-elastic modulator and detection of an anisotropic contribution to the transient signal by a highly-sensitive demodulation balanced scheme. The method was tested on aqueous solution of coenzyme NADH (nicotinamide-adenine-dinucleotide) pumped at 360 nm and probed at 720 nm. Anisotropic vibrational relaxation and rotational diffusion have been observed in the sub-picosecond time domain. The method significantly enhances the accuracy of transient measurements and allows for recording of high-quality signals at low energy (a nJ) pump pulses.

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Ioanna A. Gorbunova, Nikolai O. Bezverkhnii, Maxim E. Sasin, Idris M. Gadzhiev, Daria A. Gorbenko, and Oleg S. Vasyutinskii "Ultrafast polarization-modulation transient spectroscopy to study electronic excited state dynamics in biological molecules", Proc. SPIE 11497, Ultrafast Nonlinear Imaging and Spectroscopy VIII, 1149713 (20 August 2020); https://doi.org/10.1117/12.2567532

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