Atomic-hydrogen mapping in hot-filament chemical-vapor deposition.

Two-dimensional maps of the atomic-hydrogen concentration distribution were acquired with two-photon laser-induced fluorescence. The environment was a hot-filament chemical-vapor-deposition reactor used for polycrystalline diamond-film deposition. The maps were measured in situ under diamond-deposition conditions with variation of the growth parameters. The parameters investigated were filament temperature, input methane concentration, and total pressure.

Sluggish auditory processing in dyslexics is not due to persistence in sensory memory.

The hypothesis that dyslexics show prolonged audible persistence was tested by an event-related brain response technique and rejected in favour of an attentional explanation.