Excited states in nucleon structure calculations

Relativistic Pseudopotential Calculations for Electronic Excited States

Relativistic and electron correlation effects play a important role in the electronic structure of molecules containing heavy elements (main group elements, transition metals, lanthanide and actinide complexes). It is therefore mandatory to account for them in quantum mechanical methods used in theoretical chemistry, when investigating for instance the properties of heavy atoms and molecules in...

Excited States Calculations for Protonated PAHs

Isolating excited states of the nucleon in lattice QCD

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Electromagnetic polarizabilities and the excited states of the nucleon

The electromagnetic polarizabilities of the nucleon are shown to be essentially composed of the nonresonant αp(E0+) = +3.2, αn(E0+) = +4.1, the t-channel α t p,n = −βt p,n = +7.6 and the resonant βp,n(P33(1232)) = +8.3 contributions (in units of 10 −4fm). The remaining deviations from the experimental data ∆αp = 1.2 ± 0.6, ∆βp = 1.2 ∓ 0.6, ∆αn = 0.8 ± 1.7 and ∆βn = 2.0 ∓ 1.8 are contributed by ...

Quantum Monte Carlo Calculations for Ground and Excited States

A brief overview of the diffusion quantum Monte Carlo method is given. We illustrate the application to ground-state calculations by a study of the relative stability of carbon clusters near the crossover to fullerene stability, thereby determining the smallest stable fullerene. The application to excited states is illustrated via a study of excitonic states in small hydrogenated silicon cluste...