in situ ion beam processing for josephson junction fabrication

the use of ion beam processing in fabricating josephson junction tunnel devices introduces several advantages over other plasma discharge techniques, both in substrate precleaning and oxidation. the ion flux and ion energy can be controlled independently, the energy spread is narrow, the source plasma is isolated from the substrates and c..

improving photolithographic processes with the chemical modification of si-sio/sub 2/ substrate surfaces

long-term stability of photoresist layers ensured with lower surface energy of the sio/sub x/ films is achieved with nonpolar groups leading to thermal resistance and hydrolysis immunity. as a result, the modified sio/sub x/ substrate exhibits significant changes in the contact angle obtained by tests with distilled water and other fluids..

dc characteristics of a gaas layer through a reactive ion etching process

contamination, oxidization and radiation damage are induced on a gaas surface by reactive ion etching (rie) using a o/sub 2/-discharge of 13.56 mhz in a parallel plate reactor. this formation depends on several rie conditions, such as rf power (which is equivalent to cathode-accelerated voltage) and etching time. the increase in schottky ..

an ab initio calculation of the structure and scaled quantum mechanical harmonic force field of nitromethane

a complete optimization of the nitromethane geometry at the hf/6-31g and hf/6-31g*(5d) levels for staggered (one c-h bond situated in a plane perpendicular to the plane of the heavy atoms) and eclipsed conformations is reported. the geometrical parameters obtained for the staggered conformation are in quite good agreement with the microwa..

the lure of molecular computing

the basic principles of molecular computing are described and two approaches are outlined' the biological, which seeks to duplicate the powerful information processing capabilities of biological systems: and the digital, which seeks to create a molecular electronics that would lead to a smaller, faster, less-expensive digital computer wit..

carbon and carbon-coated electrodes for multistage depressed collectors for electron-beam devices-a technology review

important aspects of the carbon and carbon-coated multistage depressed collectors (mdc) electrode technology developed at the nasa lewis research center as well as related technology developed under nasa sponsorship are reviewed. the following topics are included' electrode material properties, surface treatment procedures, surface physic..

surface studies of e-glass fiber composite interfaces using diffuse reflectance and photoacoustic ftir spectroscopy

drift and pas ft-ir techniques have been applied to quantitative analysis of coupling agent, n-2-aminoethyl-3-aminopropyltriethoxysilane ( gamma -aaps) on the e-glass mats. it is shown that both techniques are sensitive to the surface treatment and can successfully be used to quantitatively analyze the surface species. this quantitative a..

exfoliation of benzene-derived graphite fibers

utilizing the unique microstructure of benzene-derived fibers, the authors have achieved volume increases by factors of as much as approximately 150 upon exfoliation or more than an order of magnitude greater than previous reports with graphite fibers results are also reported on the characterization of the exfoliated fibers. intercalated..

physico-chemical and electrical arsenic-stabilization of inp surface for mis device applications

thermal treatment at temperatures exceeding 500 degrees c under an arsenic (as) atmosphere of inp substrates results in improved electronic and physicochemical properties of the inp surface in that' the surface state density as derived from capacitance/voltage measurements on mis structures fabricated on treated substrates, is significant..

manufacturing process for high stability precision crystals

a complete manufacturing process flow chart is presented which incorporates all state of the art process technology developed over the last forty years. using this process, precision crystals are fabricated which achieve the highest stability that is required in today's market. some of the process developments included are electrothermal ..