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Waste Water Derived Electroactive Microbial Biofilms: Growth, Maintenance, and Basic Characterization

Waste Water Derived Electroactive Microbial Biofilms: Growth, Maintenance, and Basic Characterization

Published on: December 29, 2013

How do small water clusters bind an excess electron?

Nathan I Hammer¹, Joong-Won Shin, Jeffrey M Headrick

¹Sterling Chemistry Laboratory, Yale University, Post Office Box 208107, New Haven, CT 06520, USA.

Science (New York, N.Y.)

|September 18, 2004

Summary

This summary is machine-generated.

Researchers have elucidated the structure of water molecules around a hydrated electron using vibrational spectroscopy. This finding reveals how electrons bind to water clusters, explaining a long-standing mystery in physical chemistry.

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Area of Science:

Physical Chemistry
Chemical Physics
Spectroscopy

Background:

The structure of water molecules surrounding a hydrated electron has remained unexplained for over four decades.
Understanding this solvation structure is crucial for various chemical and physical processes.

Purpose of the Study:

To investigate the arrangement of water molecules around a hydrated electron.
To characterize the electron-binding site in small water cluster anions.

Main Methods:

Vibrational spectroscopy of gas-phase water cluster anions, specifically (H2O)(4-6)- and (D2O)(4-6)-.
Analysis of sharp vibrational bands to determine the electron-binding site.
Line shape analysis to determine vibration-to-electronic energy transfer rates.

Main Results:

Identified a detailed picture of the diffuse electron-binding site.
The electron is localized on a single water molecule, acting as a double H-bond acceptor.
Observed dramatic distortions in local OH stretching bands for smaller clusters due to strong coupling to the electron continuum.
Determined that vibration-to-electronic energy transfer rates are mode-specific and exceptionally fast (e.g., symmetric stretch < 50 fs in (H2O)4-).

Conclusions:

The study provides a clear structural model for the hydrated electron in small water clusters.
Fast, mode-specific vibrational energy transfer to the electron is a key characteristic of this system.
These findings resolve a long-standing puzzle in the understanding of hydrated electrons.