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Physics > Chemical Physics

Title: Ultrafast Photodynamics of Glucose

Abstract: We have investigated the photodynamics of $\beta$-D-glucose employing our field-induced surface hopping method (FISH), which allows us to simulate the coupled electron-nuclear dynamics, including explicitly nonadiabatic effects and light-induced excitation. Our results reveal that from the initially populated S$_{1}$ and S$_{2}$ states, glucose returns nonradiatively to the ground state within about 200 fs. This takes place mainly via conical intersections (CIs) whose geometries in most cases involve the elongation of a single O-H bond, while in some instances ring-opening due to dissociation of a C-O bond is observed. Experimentally, excitation to a distinct excited electronic state is improbable due to the presence of a dense manifold of states bearing similar oscillator strengths. Our FISH simulations explicitly including a UV laser pulse of 6.43 eV photon energy reveals that after initial excitation the population is almost equally spread over several close-lying electronic states. This is followed by a fast nonradiative decay on the time scale of 100-200 fs, with the final return to the ground state proceeding via the S$_{1}$ state through the same types of CIs as observed in the field-free simulations.
Subjects: Chemical Physics (physics.chem-ph)
Journal reference: J. Phys. Chem. B 2018, 122, 19-27
DOI: 10.1021/acs.jpcb.7b08602
Cite as: arXiv:1803.06856 [physics.chem-ph]
  (or arXiv:1803.06856v1 [physics.chem-ph] for this version)

Submission history

From: Jens Petersen [view email]
[v1] Mon, 19 Mar 2018 10:20:13 GMT (3503kb,D)