Issues

New optical techniques based on the application of fundamental physical principles to photomask design may bring about a revolution in the patterning of integrated circuits.

Recent progress in semiclassical theory has overcome barriers posed by classical chaos and cast light on the correspondence principle. Semiclassical ideas have also become central to new experiments in atomic, molecular, microwave and mesoscopic physics.

Impact craters on Venus's surface are surprisingly unscarred by tectonic deformation and volcanic flows. Data from the Magellan mission may help discriminate between catastrophic and evolutionary explanations of the planet's recent placidity.