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On the importance of initial conditions for excited-state dynamics

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Abstract

Photodynamical simulations are increasingly used to explore photochemical mechanisms and interpret laser experiments. The vast majority of ab initio excited-state simulations are performed within semiclassical, trajectory-based approaches. Apart from underlying electronic-structure theory, the reliability of simulations is controlled by a selection of initial conditions for the classical trajectories. We discuss appropriate choices of initial conditions for simulations of different experimental arrangements: dynamics initiated by continuum-wave (CW) laser fields or triggered by ultrashort laser pulses. We introduce a new technique, CW-sampling, to treat the former case, based on the ideas of importance sampling, combined with the quantum thermostat approach based on the Generalized Langevin Equation (GLE) that allows for efficient sampling of both position and momentum space. The CW-sampling is particularly important for photodynamical processes initiated by absorption at the tail of the UV absorption spectrum. We also emphasize the importance of non-Condon effects for the dynamics. We demonstrate the performance of our approach on the photodissociation of the CF2Cl2 molecule (Freon CFC-12). A quantitative agreement with the experimental data is achieved with the use of empirical correlation energy correction (CEC) factor on top of FOMO-CASCI potential energy surfaces.

Graphical abstract: On the importance of initial conditions for excited-state dynamics

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Publication details

The article was received on 02 May 2018, accepted on 25 May 2018 and first published on 25 May 2018


Article type: Paper
DOI: 10.1039/C8FD00088C
Citation: Faraday Discuss., 2018, Advance Article
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    On the importance of initial conditions for excited-state dynamics

    J. Suchan, D. Hollas, B. F. E. Curchod and P. Slavíček, Faraday Discuss., 2018, Advance Article , DOI: 10.1039/C8FD00088C

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