摘要:

Void formation during electromigration has been observed near the anode edge of a Cu‐Al zone in an Al stripe. Growth of new voids was continuous with a void front propagating along the electron flow direction at a nonlinear rate. Such motion of the void front can be quantitatively correlated to the electromigration of Cu at grain boundaries. The measured displacements of the void front were analyzed to yield the grain‐boundary diffusivity and effective charge for Cu electromigration.

ISSN:0003-6951    

DOI:10.1063/1.88458

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

Ion implantation was found to reduce the velocity of an acoustic surface wave propagating in lithium niobate. This frequency‐dependent decrease may be mainly attributed to a reduction of the effective electromechanical coupling coefficient as reported in this letter. The impedance of 138‐MHz interdigital transducers deposited on implanted niobate substrates has been determined versus ion dose.

ISSN:0003-6951    

DOI:10.1063/1.88459

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

The absence of C‐H bonds in aprotic and particularly in molecular liquids possessing a wide liquid range enhances the probability of observing &agr; processes in these liquids. Evidence for electron multiplication and breakdown in the liquid phase of sulfur is presented. Current‐voltage nonlinearities and the bubble‐free development of electrical discharges are observed.

ISSN:0003-6951    

DOI:10.1063/1.88460

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

Tetrachloro–&mgr;‐hydroxo–&mgr;‐carboxylatodichromium (III) complexes have been used to induce homeotropic alignment of nematic, smectic, and large‐pitch cholesteric liquid crystals. A dynamic scattering degradation test has shown that this orientation is remarkably stable.

ISSN:0003-6951    

DOI:10.1063/1.88461

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

Images from the acoustic microscope can be recorded with increased clarity and additional detail if one uses an ’’off‐axis’’ arrangement wherein the axis of the output lens is tilted with respect to the input lens. Also, stereograms have been recorded by canting the plane of the object. With a stereoscopic viewer, depth information becomes apparent and texture can be seen.

ISSN:0003-6951    

DOI:10.1063/1.88462

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

A HCN laser interferometer of the Ashby‐Jephcott type operating at a wavelength of 337 &mgr;m was used to measure spatially resolved electron densities in a stationary MPD‐type plasma jet with non‐LTE behavior. Experiments were performed with and without superimposed magnetic fields up to 0.1 T at the exit of the plasma accelerator. Electron densities were obtained within the limits of 5×1012and 1015cm−3with an accuracy better than 10%. Within the axially symmetric expanding plasma of about 15‐cm average diameter and 50‐cm length the radial resolving power came to less than 1 cm. So this technique has proved to be suitable to fill a gap in the diagnostics of stationary magnetized plasmas in the mean range of electron densities.

ISSN:0003-6951    

DOI:10.1063/1.88463

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

Measurements have been made of the current flow in amorphous WO3films containing electrons and mobile cations. In a configuration in which electrons are extracted at one contact and cations at the other, the current decays ast−3/4over many decades of time. By using space‐charge current flow ideas, we develop a theory that gives the correct time dependence and magnitude of the current for this double‐extraction phenomenon.

ISSN:0003-6951    

DOI:10.1063/1.88464

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

With the time‐of‐flight technique we have measured the longitudinal diffusion coefficient of electrons in silicon at 300 K for fields from Ohmic up to 50 kV/cm. The results have been interpreted by means of Monte Carlo calculations with a theoretical model which includes the many‐valley (ellipsoidal and nonparabolic) structure of the band, acoustic intravalley, and severalfandgintervalley scattering mechanisms.

ISSN:0003-6951    

DOI:10.1063/1.88465

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

A 496‐&mgr;m CH3F cavity laser characterized by an average power of 9 kW and predominant single longitudinal mode operation with a linewidth of 28 MHz has been constructed. The power conversion efficiency of the laser (CH3F power out/CO2pump power in) is on the order of 1.5×10−3. The CH3F gas is pumped in a zig‐zag fashion by the CO2laser radiation.

ISSN:0003-6951    

DOI:10.1063/1.88445

出版商:AIP    

年代:1975

数据来源: AIP

摘要:

A simple technique is proposed to determine the exact amount of charge in the nitride layer of MNOS structures and the centroid of its distribution throughout the layer. The technique is only significant for MNOS devices with a thick nitride layer. From experimental data it is shown, using this technique, that the charge is trapped deep into the nitride layer, to a depth depending on the initial nitride field.

ISSN:0003-6951    

DOI:10.1063/1.88446

出版商:AIP    

年代:1975

数据来源: AIP