Dynamic polarizability, Cauchy moments, and the optical absorption spectrum of liquid water: A sequential molecular dynamics/quantum mechanical approach

The dynamic polarizability and optical absorption spectrum of liquid water in the 6-15 eV energy range are investigated by a sequential molecular dynamics (MD)/quantum mechanical approach. The MD simulations are based on a polarizable model for liquid water. Calculation of electronic properties relies on time-dependent density functional and equation-of-motion coupled-cluster theories. Results for the dynamic polarizability, Cauchy moments, S(-2), S(-4), S(-6), and dielectric properties of liquid water are reported. The theoretical predictions for the optical absorption spectrum of liquid water are in good agreement with experimental information.FCT (Portugal)/CAPES (Brazil)FCT (Portugal)[SFRH/BPD/38447/2007]Fundacao para a Ciencia e a Tecnologia (FCT), Portugal[POCI/MAT/55977/2004]Fundacao para a Ciencia e a Tecnologia (FCT), Portugal[PTDC/QUI/68226/2006