Andrew L. Aquila

Aug 10, 2023 | nature.com | James Baxter |Ann Fitzpatrick |Douglas Garratt |Rhodri Morgan |Chi-Yun Lin |Jon P. Marangos | +21 more

AbstractThe photoisomerization reaction of a fluorescent protein chromophore occurs on the ultrafast timescale. The structural dynamics that result from femtosecond optical excitation have contributions from vibrational and electronic processes and from reaction dynamics that involve the crossing through a conical intersection. The creation and progression of the ultrafast structural dynamics strongly depends on optical and molecular parameters.

Jun 8, 2023 | nature.com | Benjamin Poulter |Elisa Biasin |Roberto Alonso-Mori |Andrew L. Aquila |Sébastien Boutet |Phay J. Ho | +5 more

AbstractFemtosecond pump-probe spectroscopy using ultrafast optical and infrared pulses has become an essential tool to discover and understand complex electronic and structural dynamics in solvated molecular, biological, and material systems. Here we report the experimental realization of an ultrafast two-color X-ray pump X-ray probe transient absorption experiment performed in solution.