Issues

Discrepancies that had cast doubt on the value of low‐energy electron diffraction as a tool for defining the positions of surface atoms have been resolved, and new techniques are enhancing its usefulness.

Observations and experiments are under way in response to the growing concern that widely used fluorocarbons might cause a depletion in Earth's protective ozone layer.

…where the Bicentennial Celebration will provide a background for such “revolutionary” topics as laser spectroscopy, radiological imaging and fiber optics.