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Cross Sections for X-Ray Photoelectron-Induced Desorption of Hydrogen Ions From Metal Surfaces

Description: We have measured the cross sections for x-ray photoelectron-induced desorption of hydrogen ions from beryllium, carbon, aluminum, tantalum, and gold surfaces. This report describes the results of the cross-section measurements, and discusses a time-of-flight technique that allows the determination of ionic-desorption cross sections as small as 10/sup -25/ cm/sup 2/ per photoelectron. 19 refs., 7 figs.
Date: September 20, 1985
Creator: Kinney, J. H.; Siekhaus, W. J. & Anderson, R. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Titanium/gold process characterization

Description: Characterization of the titanium/gold (Ti/Au) deposition process used at the Allied-Signal Inc., Albuquerque Microelectronics Operation (AMO) was performed. Tests were conducted to set up evaporation parameters, correlate titanium and gold thicknesses to sheet resistance, improve thickness uniformity, and reduce frontside contamination of deposit material on product wafers. The Ti/Au process is the final step in the production of integrated circuits (ICs) at the AMO wafer fabrication facility. … more
Date: November 1, 1991
Creator: Fajardo, L.S.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Effect of Au on the reliability of fine pitch surface mount solder joints

Description: The effect of Au on the reliability of 0.65 mm pitch surface mount solder joints between plastic quad flat packs and Cu-Ni-Au FR-4 printed circuit boards was investigated. Cu-Ni-Au is a desirable printed circuit board finish for multi-chip modules or printed circuit boards that would otherwise require a selective Au finish, for example for edge connectors or wire bondable parts. However, Au is known to embrittle solder when it is present in sufficiently high concentrations, creating a concern t… more
Date: May 1, 1991
Creator: Glazer, J. (Hewlett-Packard Co., Palo Alto, CA (United States)); Kramer, P. & Morris, J.W. Jr. (Lawrence Berkeley Lab., CA (United States))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Resonance ionization mass spectrometry at Los Alamos National Laboratory

Description: Two approaches to RIMS will be discussed here. The first is the use of continuous-wave (cw) dye lasers as the ionization source. Continuous excitation effectively matches the ionization to the evaporation of sample from a resistively heated filament, providing for efficient use of the sample. In addition, cw ionization permits pulse counting detection, necessary for the measurement of large isotope ratios on small samples. In the cases of lutetium and technetium discussed below, average ionizat… more
Date: January 1, 1986
Creator: Miller, C. M.; Nogar, N. S.; Apel, E. C. & Downey, S. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Metal-insulator-semiconductor photovoltaic devices

Description: The overall objective of this program is to conduct research on metal-insulator-semiconductor (MIS) solar cells to improve understanding of the basic parameters which control photovoltaic processes in these cell structures. Current work includes fabrication, characterization, and theoretical studies of single crystal silicon-based cells, with Si0/sub x/ as the insulating film and Al or Au as the front metal contact. Studies of these two systems are intended to provide needed reference systems f… more
Date: June 1, 1979
Creator: Olsen, L. C.; Garnier, J. E. & Turcotte, R. P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Semiconductor chip processing. Final report

Description: The processes necessary to assemble metal-oxide semiconductor devices in hermetic ceramic packages were developed. The assembly techniques developed were gold-silicon die attachment, 25.4-..mu..m aluminum wire interconnection, and gold-tin cover attachment.
Date: July 1, 1980
Creator: Grimm, A.V.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Comparison of cesium iodide and gold photocathodes for x-ray streak cameras

Description: X-ray streak cameras at Lawrence Livermore Laboratory use gold transmission photocathodes for x-ray detection. Other photocathode materials which might provide improved sensitivity without loss of temporal resolution are of interest. Of particular interest are dielectrics such as cesium iodide. Simultaneous measurements of the sensitivity to 500 eV x-rays of both gold and cesium iodide photocathodes in the LLL Soft X-ray Streak Camera were made. Enhanced sensitivity with the Csl photocathodes i… more
Date: January 1, 1979
Creator: Stradling, G.L.; Medecki, H.; Attwood, D.T.; Kauffman, R.L. & Henke, B.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Muon Diffusion in Noble Metals

Description: Diffusion-induced muon depolarization was measured in dilute AgGd and AgEr in the temperature range 200 to 700/sup 0/K and have thereby determined the muon diffusion parameters in Ag. The diffusion parameters for ..mu../sup +/ in Cu, Ag, and Au are compared with those of hydrogen. For Ag and Au, the ..mu../sup +/ parameters are similar to those of hydrogen, whereas for Cu, the ..mu../sup +/ parameters are much smaller. Lattice-activated tunneling and over-barrier hopping are investigated with c… more
Date: January 1, 1982
Creator: Schillaci, M. E.; Boekema, C.; Heffner, R. H.; Hutson, R. L.; Leon, M.; Olsen, C. E. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Uranium hydrogeochemical and stream sediment reconnaissance data release for the Elk City NTMS Quadrangle, Idaho/Montana, including concentrations of forty-five additional elements

Description: Totals of 1580 water and 1720 sediment samples were collected from 1754 locations in the quadrangle. Elemental concentration, field measurement, weather, geologic, and geographic data for each sample location are listed for waters in Appendix I-A and for sediments in Appendix I-B. Uranium/thorium ratios for sediment samples are also included in Appendix I-B. All elemental analyses were performed at the LASL. Water samples were initially analyzed for uranium by fluorometry. All water samples con… more
Date: July 1, 1980
Creator: Broxton, D. E. & Beyth, M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Hybrid microcircuit via development. Final report

Description: Manufacturing processes were developed for making holes in alumina substrates, metallizing substrates on both sides and through the holes (vias), dry film photolithographing 6-..mu..m-thick gold to 127-..mu..m line widths and spacings, determining via quality, and protecting vias during HMC assembly processes. The few problems encountered were solved, and via technology is now established as a reliable and repeatable production technology for hybrid microcircuits. Via resistance on product HMCs… more
Date: June 1, 1980
Creator: Norwood, D.P.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Analysis of polarization properties of shallow metallic gratings by an extended Rayleigh-Fano Theory

Description: Rayleigh-Fano theory has been extended for the purpose of calculating the polarization anomaly of a grating having shallow grooves and finite conductivity. Simple analytic formulas are derived for predicting the position and the appearance of the anomalies. Phenomenological explanations are given to the origin of the anomalies. The validity of our analysis is examined by comparing computed degree of polarization with experimental data obtained in the visible region for Al-, Ag-, and Au-coated b… more
Date: June 1, 1991
Creator: Koike, Masato (Lawrence Berkeley Lab., CA (United States)) & Namioka, Takeshi (Tohoku Univ., Sendai (Japan). Research Inst. for Scientific Measurements)
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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SEM technique for experimentally locating latch-up paths in integrated circuits

Description: A technique is presented for using the scanning electron microscope (SEM) in the electron-beam-induced current (EBIC) mode to delineate latch-up paths in CMOS ICs. In the EBIC mode, the current produced by the collection and separation of the electron-beam-generated electron-hole pairs in the space charge regions of the device is measured and used to form an image. Since the collection of these carriers is dependent on space charge region width (and thus junction potential), anything that alter… more
Date: January 1, 1980
Creator: Dressendorfer, P. V. & Armendariz, M. G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Fragmentation and flow in central collisions

Description: Investigation of the fragmentation mechanism requires the measurement of complicated observables. To identify what part of the reacting system gives rise to the fragments, it would be useful to tag them as participants or spectators. A large acceptance for all the reaction products and an event-by-event measurement of the fragment multiplicity is required to distinguish fragment formation via sequential emission from a large equilibrated system and multifragmentation. In order to address whethe… more
Date: January 1, 1987
Creator: Jacak, B. V.; Doss, K. G. R.; Gustafsson, H. A.; Gutbrod, H.; Harris, J. W.; Kampert, K. H. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Failure mechanisms in beam lead semiconductors

Description: Hybrid microcircuits, using beam lead devices as active components, consist of sputtered tantalum-nitride (Ta/sub 2/N) resistors and evaporated chromium--gold (Cr--Au) conductors on alumina substrates with applique components and thermocompression bonded ribbons, lead frames, fine wires, and beam lead devices. During recent testing of HMCs for a new program, failures of beam lead devices (BLDs) resulted in unacceptable yields and increased rework. These BLD failures showed up primarily as incre… more
Date: January 1, 1977
Creator: Brown, U. C. & Sim, J. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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A Modified Pyroelectric Sodium Fluoride Carrier Distillation Medthod For The Spectrographic Analysis Of Impurities In Plutonium

Description: A modification of the pyroelectric sodium fluoride carrier distillation method for analysis of impurities in plutonium metal is described. The metal is dissolved. Plutonium is precipitated and treated with nitric acid. The slurry obtained is dried and ignited. The resultant low density oxide is mixed with sodium fluoride and pressed into a pellet for arcing. Cobalt is used as the internal standard for densitometric using visual comparisons against prepared standards. The procedural modification… more
Date: August 1, 1966
Creator: Schreiber, G. A. & Barrick, C. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Ion scattering studies of some actinide materials. [E < 650 eV]

Description: Surfaces of polycrystalline U, Th, and single crystalline UO/sub 2/(111) were examined with He/sup +/, Ne/sup +/, and Ar/sup +/ at incident beam energies E/sub i/ less than or equal to 650 eV. A double-pass cylindrical mirror analyzer was used in a custom vacuum system intended primarily for UPS. The approach was to determine if the instrument could serve in a complementary ISS capacity and, if so, what the ion scattering conditions are for detecting surface oxygen and the actinides. Data are p… more
Date: January 1, 1977
Creator: Ellis, W. P. & Taylor, T. N.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Versatile electrochemical microsensors for environmental monitoring

Description: The fabrication of novel multielement microelectrode array sensors is reported. With regard to individual array elements, two main concepts are pursued. One involves the use of relatively non-selective microelectrode elements, coupled with pattern recognition methods, for data analysis. This strategy is most applicable when prior knowledge about the chemical environment is limited, or when mainly qualitative information is sought. The second concept involves the development of arrays containing… more
Date: October 1, 1991
Creator: Glass, R.S.; Hong, K.C. (Lawrence Livermore National Lab., CA (United States). Chemistry and Materials Science Dept.); Ashley, K. (San Jose State Univ., CA (United States). Dept. of Chemistry) & Granstaff, V.E. (Sandia National Labs., Albuquerque, NM (United States))
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Thin film gold etchant formulation and rinse removal. Final report

Description: The chemistry of gold etchant solutions used in photolithography of thin film networks (TFNs) for hybrid microcircuits was reviewed. The formulation and operating limits were revised to ensure that the initial solution makeup is always within required values for iodine concentration and specific gravity and that the etchant will not be used for an extended period of time. Rinsing procedures for removal of the gold etchant from the TFNs were evaluated. Increasing the rinse time beyond 15 seconds… more
Date: July 1, 1980
Creator: Raut, M. K.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Development of plating thickness standards. Milestone report

Description: Standards which are unavailable from the National Bureau of Standards were developed to support the nondestructive measurement of plating thickness. Their fabrication, measurement, certification, and calibration-recall schedule are discussed. Reference standards that have been put into service include aluminum/Kapton, silver/copper, tin/steel, gold/silver, cadmium/Kovar, silver/iron, rhodium/copper, and gold/ceramic. 6 figures, 3 tables.
Date: January 1, 1978
Creator: Russell, R. J.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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