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Title: Ab Initio Multiple Spawning Photochemical Dynamics of DMABN Using GPUs

Journal Article · · Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory

The ultrafast decay dynamics of 4-(N,N-dimethylamino)benzonitrile (DMABN) following photoexcitation was studied with the ab initio multiple spawning (AIMS) method, combined with GPU-accelerated linear-response time-dependent density functional theory (LR-TDDFT). We validate the LR-TDDFT method for this case and then present a detailed analysis of the first ≈200 fs of DMABN excited-state dynamics. Almost complete nonadiabatic population transfer from S2 (the initially populated bright state) to S1 takes place in less than 50 fs, without significant torsion of the dimethylamino (DMA) group. Significant torsion of the DMA group is only observed after the nuclear wavepacket reaches S1 and acquires locally excited electronic character. Here, our results show that torsion of the DMA group is not prerequisite for nonadiabatic transitions in DMABN, although such motion is indeed relevant on the lowest excited state (S1).

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-76SF00515; P2ELP2_151927
OSTI ID:
1360220
Journal Information:
Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory, Vol. 121, Issue 1; ISSN 1089-5639
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 43 works
Citation information provided by
Web of Science

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Turbomole
  • Furche, Filipp; Ahlrichs, Reinhart; Hättig, Christof
  • Wiley Interdisciplinary Reviews: Computational Molecular Science, Vol. 4, Issue 2 https://doi.org/10.1002/wcms.1162
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Cited By (11)

Excited-state dynamics of molecules with classically driven trajectories and Gaussians journal September 2019
CT-MQC – a coupled-trajectory mixed quantum/classical method including nonadiabatic quantum coherence effects journal July 2018
Coupled cluster theory in the condensed phase within the singles‐T density scheme for the environment response journal January 2020
An exact-factorization perspective on quantum-classical approaches to excited-state dynamics journal July 2018
CCSD‐PCM Excited State Energy Gradients with the Linear Response Singles Approximation to Study the Photochemistry of Molecules in Solution journal May 2019
A walk through the approximations of ab initio multiple spawning journal April 2018
Discovery of conical intersection mediated photochemistry with growing string methods journal January 2018
Assessing the performance of trajectory surface hopping methods: Ultrafast internal conversion in pyrazine journal April 2019
Excited-state dynamics of molecules with classically driven trajectories and Gaussians text January 2019
Excited-state dynamics of molecules with classically driven trajectories and Gaussians text January 2019
Nonadiabatic Molecular Dynamics on Graphics Processing Units: Performance and Application to Rotary Molecular Motors journal October 2019

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