Electron emitters in vacuum microelectronic devices need sharp tips in order to permit electron emission at moderate voltages. A method has been found for preparing uniform silicon tips with a radius of curvature less than 1 nm. These tips are formed by oxidation of 5-μm-high silicon cones through exploitation of a known oxidation inhibition of silicon at regions of high curvature.
We have developed and used for the first time a soft x-ray interferometer to probe a large laserproduced plasma with micron spatial resolutions.A neonlike yttrium x-ray laser operating at 155 A was combined with a multilayer coated Mach-Zehnder interferometer to obtain electron density profiles in a plasma produced by laser irradiation of a CH target. The measured electron density profile has been compared to hydrodynamic simulations and shows good agreement near the ablation surface but some discrepancy exists at lower densities.
Thieisa prejmintof apaperintended forpublication ina joumalorpmceedinga Since changes may be made before publication, this preprint ie made available with the understanding that it will not be cited 01 reproduced without the permission of the author.
The anisotropic etching of (110) oriented silicon wafers is used to fabricate a simple latching accelerometer for moderate and high-g applications. This accelerometer consists of two cantilever beams that interlock at a set threshold acceleration which is determined by their design. The accelerometer is robust, fairly easy to fabricate and can be mass produced. Two units designed to latch at 85 g and 600 g were tested on a centrifuge and the error between the calculated latching acceleration and the experimental result was less than 15%. Arrays of accelerometers can be easily fabricated on the same silicon wafer to bracket the true acceleration. Readout schemes could include either capacitive or optical techniques. The structure can be easily designed for a wide range of acceleration ranging from a few g to several thousand g.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.