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Updated: May 23, 2026

Proton Transfer and Protein Conformation Dynamics in Photosensitive Proteins by Time-resolved Step-scan Fourier-transform Infrared Spectroscopy
Published on: June 27, 2014
The influence of the optical pulse shape on excited state dynamics in provitamin D3
Kuo-Chun Tang1, Roseanne J Sension
1Department of Chemistry, University of Michigan, 930 N. University Ave., Ann Arbor, Michigan, USA.
Abstract:
Broadband visible transient absorption spectroscopy was used to characterize the excited state population of 7-dehydrocholesterol (provitamin D3, DHC) following excitation by UV pulses with systematically varied linear chirp. These experiments demonstrate that the phase of the excitation pulse can modify the observed excited state decay. The results suggest that coherent mechanisms involving multiple interfering pathways may be exploited to control branching between excited state pathways and manipulate product formation.
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