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Solid phase regrowth of Si on sapphire has been investigated in the Si (amorphous)/Al (poly)/Al 2 O 3 (crystal) system. Using transmission electron microscopy, scanning electron microscopy, Auger electron spectroscopy, and Hall‐effect measurements, it has been shown that Si is transported...
By laser beam scanning the optoacoustic signal as a function of the sample coordinates is obtained. Examples for surface and subsurface imaging and for image contrasting are presented.
Stored microwave energy has been released using a high‐intensity electron beam switch. Experiments using this switch have produced energy compression at room temperature and pulses as short as several nanoseconds. Here we discuss the experimental results and the underlying theory.
The remarkable unity found in the high‐field behavior of thin‐film amorphous chalcogenides is illustrated by comparing pulse data ranging from nanosecond to millisecond duration. Sixteen long‐pulse effects had earlier been described in detail by coupled carrier theory, which postulates one...
We derive an equation to predict the output of an optically pumped far infrared oscillator as function of pump pulse and resonator parameters. Results of a parametric study are presented and a comparison is made with experimental results from a D 2 O laser at 66 μm.
Effects of ultrasonic waves propagating at an angle ϑ relative to the direction of a dc magnetic field in nondegenerate piezoelectric semiconductors such as n ‐type InSb have been studied by using a quantum treatment which is valid at high frequencies and in strong magnetic fields. The...
The microstructure and properties of ZnO varistors containing Ba, Co, and rare‐earth–metal oxides, which give values of α α= d (log I )/ d (log V ) as high as 29, are examined. Mean ZnO grain size is 11 μm, and the grains are uniformly doped with Co. The barium and rare earth metals...
An experimental investigation has demonstrated that the previously observed wall‐supported shock precursor, in high‐explosive‐driven argon‐containing shock tubes, rapidly grows to a maximum length at a tube length‐to‐diameter ratio of 2. It then gradually decreases in length and grows...
The infrared absorption of Si‐rich SiO 2 films has been measured using the attenuated total reflection technique. Absorption lines attributed to SiOH, H 2 O, and SiH groups have been observed in the as‐deposited films. The concentrations of the SiOH and H 2 O impurities were found to be in...
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