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Updated: Jun 14, 2026

Small and Wide Angle X-Ray Scattering Studies of Biological Macromolecules in Solution

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Published on: January 8, 2013

Amorphous Solid Water: An X-ray Diffraction Study.

C G Venkatesh, S A Rice, A H Narten

Science (New York, N.Y.)

|December 6, 1974

Summary

This summary is machine-generated.

Researchers studied amorphous solid water formed at 10 K. Its structure differs from ice, offering insights into liquid water models by separating disorder and thermal effects.

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Area of Science:

Condensed matter physics
Materials science
Physical chemistry

Background:

Amorphous solid water (ASW) is a noncrystalline phase of water.
Understanding ASW structure is crucial for modeling liquid water.
Previous studies on ASW structure have been limited by data resolution.

Purpose of the Study:

To characterize the structure of amorphous solid water formed at low temperatures.
To compare the structural properties of ASW with known ice phases.
To evaluate ASW as a model system for liquid water studies.

Main Methods:

Condensation of water vapor onto a metal surface at 10 Kelvin.
High-precision, high-resolution X-ray diffraction analysis.
Calculation of oxygen atom pair correlation functions.

Main Results:

ASW formed at 10 K has an estimated density of 1.2 g/cm³.
Positional correlations in ASW extend only a few molecular radii.
The radial distribution of oxygen atoms in ASW is distinct from low-pressure ice forms.

Conclusions:

Amorphous solid water exhibits unique structural characteristics compared to crystalline ice.
ASW provides a valuable system for investigating liquid water properties.
Separating static disorder and thermal excitation effects in ASW aids in understanding water's complex behavior.