Talk at QBIC IV in Bath

On 5 September, Felix Plasser will give a talk entitled “Transition Metal Complex Excited States: Turning Numbers into Chemical Insight” at the Quantum-Bio-Inorganic Chemistry Conference IV in Bath. The talk will discuss the automatic assignment of excited-state character for transition metal complexes and present some recent results about using conditional electron densities for visualising excited-state correlation effects.

You can download the slides here:

Talk at EuCheMS in Liverpool

On 29 August, Felix Plasser will give a talk entitled “Analysis of Excited-State Computations: Turning Numbers into Chemical Insight” at the 7th EuCheMS Chemistry Congress in Liverpool. The talk will present an automatic analysis of thousands of excited states in the case of interacting DNA nucleobases and introduce a method for analysing electron correlation effects in real space, exemplified in the case of a conjugated polymer.

You can download the slides here:

Paper: Multireference Approaches for Excited States

We just published a comprehensive and quite voluminous review paper about “Multireference Approaches for Excited States of Molecules”  in Chemical Reviews. The paper covers the major methods used nowadays, such as CASSCF, multireference (MR) configuration interaction, MR perturbation theory, and MR coupled cluster. It discusses the application of semiempirical Hamiltonians as well as connections to DFT. The emerging algorithms DMRG and full-CI Quantum Monte Carlo are included as well. The theory of gradients as well as MR diagnostics and wavefunction analysis are discussed. The presented applications include a variety of cases starting from diatomics and going to complexes and dimers.

For a more detailed discussion of the paper, visit barbatti.org. For download options, see below.

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Paper: Vibronic coupling constants

You can find our new paper “Interstate vibronic coupling constants between electronic excited states for complex molecules” that recently appeared in JCP. The purpose of this paper was the development of a method that allows to determine interstate vibronic coupling constants, which are a decisive ingredient for model Hamiltonians used in quantum dynamics. Our idea was to start with a method based on wavefunction overlaps that is commonly used for trajectory dynamics simulations and adapt it for the case of quantum dynamics.