Direct Observation of the ππ* to nπ* Transition in 2-Thiouracil via Time-Resolved NEXAFS Spectroscopy

Fabiano Lever, D. Picconi, D. Mayer, S. Ališauskas, F. Calegari, S. Düsterer, R. Feifel, M. Kuhlmann, T. Mazza, J. Metje, M. S. Robinson, R. J. Squibb, A. Trabattoni, Matt Ware, P. Saalfrank, Thomas Wolf, M. Gühr
April 2025
Cite DOI DOI

Abstract

The study investigates the ultrafast dynamics of 2-thiouracil using time-resolved Near Edge X-ray Absorption Fine Structure (NEXAFS) spectroscopy. The researchers successfully identified absorption features corresponding to the S2 (ππ*) and S1 (nπ*) electronic states. They determined the time scale for the internal conversion from the S2 to the S1 state to be 102 ± 11 femtoseconds. The experiments were conducted at the Free Electron Laser FLASH.

Type
Journal article
Publication
The Journal of Physical Chemistry Letters
Matt Ware
Matt Ware
Staff Scientist, SRI International
Thomas Wolf
Thomas Wolf
Staff Scientist

My research is focused on discovering structure-function relationships in ultrafast photochemistry to better understand and eventually control this type of reactions.