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The partial molar volume of the hydrated electron reveals insights into its structure beyond just cavity size. This finding helps refine models of the hydrated electron in water.

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Area of Science:

  • Physical Chemistry
  • Computational Chemistry
  • Chemical Physics

Background:

  • The structure of the hydrated electron is generally accepted to involve a cavity in water.
  • However, precise cavity dimensions and surrounding water molecule arrangements remain incompletely understood.

Purpose of the Study:

  • To investigate the relationship between partial molar volume and the structure of the hydrated electron.
  • To utilize the Kirkwood-Buff (KB) approach to analyze the hydrated electron's solvation structure.

Main Methods:

  • Application of the Kirkwood-Buff (KB) method to analyze partial molar volume (Vm).
  • Relating Vm to the integral of the electron-water radial distribution function.
  • Testing three common pseudopotentials for hydrated electron descriptions.

Main Results:

  • Partial molar volume (Vm) is a sensitive indicator of the accuracy of hydrated electron models.
  • Measured Vm provides crucial constraints for developing and validating these models.
  • Vm is influenced not only by cavity size but also significantly by the extended solvation structure.

Conclusions:

  • Partial molar volume is a critical parameter for understanding hydrated electron structure.
  • It should not be solely used to infer cavity radius due to its dependence on broader solvation effects.
  • The KB approach offers valuable insights into the complex structure of the hydrated electron in aqueous solutions.