Abstract
Photoabsorption cross-sections have been calculated for HeN+ clusters of selected sizes (N=3,4,10) over a broad range of photon energies (Ephot=2-14 eV) and compared with available experimental data. Semiempirical electronic Hamiltonians derived from the diatomics-in-molecules approach have been used for electronic structure calculations and a quantum, path-integral Monte Carlo method has been employed to model the delocalization of helium nuclei. While a quantitative agreement has been achieved between the theory and experiment for He3+ and He4+, only qualitative correspondence is seen for He10+.
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