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<p>A systematic analysis of the hydration structure of Cs+ ions in solution is derived from
simulations carried out using a series of molecular models built upon a hierarchy of
approximate representations of many-body effects in ion-water interactions. It is found
that a pairwise-additive model, commonly used in biomolecular simulations, provides
poor agreement with experimental X-ray spectra, indicating an incorrect description of
the underlying hydration structure. Although the agreement with experiment improves
in simulations with a polarizable model, the predicted hydration structure is found
to lack the correct sequence of water shells. Progressive inclusion of explicit many-
body effects in the representation of Cs<sup>+</sup>-water interactions as well as account for
nuclear quantum effects is shown to be necessary for quantitatively reproducing the
experimental spectra. Besides emphasizing the importance of many-body effects, these
results suggests that molecular models rigorously derived from many-body expansions
hold promise for realistic simulations of aqueous solutions.
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Pp. xv plus 675. Illustrated. Price, 25s. Obtainable from Oxford University Press, Bombay and Calcutta This monograph is a lucid exposition of modem neurophysiology. The different chapters deal with the structure and functions of the different regions of the nervous system. Each chapter begins with historical notes and concludes with a detailed summary of the
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