Ab initio theoretical calculations of the electronic excitation energies of small water clusters

Literature Information

Publication Date 2011-10-17
DOI 10.1039/C1CP20649D
Impact Factor 3.676
Authors

Hiroto Tachikawa, Akihiro Yabushita, Masahiro Kawasaki


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Abstract

A direct ab initio molecular dynamics method has been applied to a water monomer and water clusters (H2O)n (n = 1–3) to elucidate the effects of zero-point energy (ZPE) vibration on the absorption spectra of water clusters. Static ab initio calculations without ZPE showed that the first electronic transitions of (H2O)n, 1B1 ← 1A1, are blue-shifted as a function of cluster size (n): 7.38 eV (n = 1), 7.58 eV (n = 2) and 8.01 eV (n = 3). The inclusion of the ZPE vibration strongly affects the excitation energies of a water dimer, and a long red-tail appears in the range of 6.42–6.90 eV due to the structural flexibility of a water dimer. The ultraviolet photodissociation of water clusters and water ice surfaces is relevant to these results.

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Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics
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