14 Matching Results

Search Results

Advanced search parameters have been applied.
in subjects: "Thin Films"  
Results: 1 - 14
open access

Ion beam and defect-related research in the Solid State Division. [LiNbO/sub 3/, Al/sub 2/O/sub 3/]

Description: This paper contains viewgraphs on the topic of radiation effects of solid state materials. In particular, it elaborates on ion beam deposition of thin film structures, ion implantation damage in crystals of Al/sub 2/O/sub 3/, and ion implanted optical waveguides in LiNbO/sub 3/. (LSP)
Date: August 5, 1986
Creator: Roberto, J.B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Performance of oblique angle of incidence collection systems in the VUV

Description: High rejection filters are difficult enough to achieve in the UV-VIS-IR with known materials and constants. Even more difficult is the design and manufacture of rejection filters in the EUV and VUV given the uncertainty of optical constants and their wide variation over this spectral range. We have begun work to characterize materials from 584 A to 1300 A to verify reported optical constants, in order to design and realize the optimum collection system. 8 refs., 2 figs., 8 tabs.
Date: January 1, 1986
Creator: Keller, G.L.; Scott, M.L. & Mitchell, K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Informal proposal for an Atomic Physics Facility at the National Synchrotron Light Source

Description: An Atomic Physics Facility (APF) for experiments that will use radiation from a superconducting wiggler on the NSLS X-13 port is described. The scientific justification for the APF is given and the elements of the facility are discussed. It is shown that it will be possible to conduct a uniquely varied set of experiments that can probe most aspects of atomic physics. A major component of the proposal is a heavy-ion storage ring capable of containing ions with energies of about 10 MeV/nucleon. T… more
Date: January 1, 1986
Creator: Jones, K. W.; Johnson, B. M. & Meron, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Preparation of thin films for use in generating neutral particle beams

Description: Large-area, thin aluminum foils were prepared for use in beam neutralization experiments. The foils were made using either electron beams of resistance heating. Foil thickness and uniformity were determined using alpha particles. The foils perform very well when bombarded by energetic H/sup -/ ions. (DLC)
Date: January 1, 1986
Creator: Aaron, W.S.; Zevenbergen, L.A. & Adair, H.L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Surface modification and characterization Collaborative Research Center at ORNL

Description: The Surface Modification and Characterization Collaborative Research Center (SMAC/CRC) is a unique facility for the alteration and characterization of the near-surface properties of materials. The SMAC/CRC facility is equipped with particle accelerators and high-powered lasers which can be used to improve the physical, electrical, and/or chemical properties of solids and to create unique new materials not possible to obtain with conventional ''equilibrium'' processing techniques. Surface modifi… more
Date: January 1, 1986
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Surface characterization of an energetic material, pentaerythritoltetranitrate (PETN), having a thin coating achieved through a starved addition microencapsulation technique

Description: The objective of this research was to: (1) determine the nature of a thin coating on an explosive material which was applied using a starved addition microencapsulation technique, (2) understand the coating/crystal bond, and (3) investigate the wettability/adhesion of plastic/solvent combinations using the coating process. The coating used in this work was a Firestone Plastic Company copolymer (FPC-461) of vinylchloride/trifluorochloroethylene in a 1.5/1.0 weight ratio. The energetic explosive … more
Date: May 7, 1986
Creator: Worley, C.M.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Precipitation of krypton in an amorphous Ti-Cr alloy. [Ti-Cr Thin Films]

Description: Results of a TEM investigation of the microstructural changes produced by the room temperature implantation of energetic Kr/sup +/ ions into a glassy Ti-Cr thin film are reported. As in other metals, the Kr precipitates as solid crystallites. The precipitation of crystalline Kr is accompanied by ultrafine crystallization of the metal host around each Kr crystal. With increasing fluence, the Kr precipitates grow to a critical size at which they melt, and the adjacent fine metal crystals disappea… more
Date: December 1, 1986
Creator: Allen, C. W. & Birtcher, R. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Molecular structure studies by 3D imaging of fast ion beams

Description: The use of the Coulomb-explosion technique combined with a radically new multi-particle detector, extremely thin film targets, and low-excitation ion source has enabled, for the first time, direct measurements of the complete stereochemistry of complex polyatomic molecular ions. We outline the methods used and present results for protonated acetylene (C/sub 2/H/sub 3//sup +/) and the methane cation (CH/sub 4//sup +/) as examples. We demonstrate the techniques by which these methods can be gener… more
Date: January 1, 1986
Creator: Kanter, E. P.; Vager, Z.; Both, G.; Cooney, P. J.; Faibis, A.; Koenig, W. et al.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Thin film coatings which inhibit spin relaxation of polarized potassium atoms

Description: A prototype of a polarized deuterium target which employs the spin exchange method is being developed. The mixing cell for mixing deuterium atoms and potassium vapor requires a surface that will reflect these atoms without being destroyed by the corrosive potassium. Thin film coating methods and a technique for coating pyrex are described. Results of spin relaxation measurements are given. (LEW)
Date: January 1, 1986
Creator: Thomas, G.E.; Holt, R.J.; Boyer, D.; Green, M.C.; Kowalczyk, R.S. & Young, L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Microstructure of metastable metallic alloy films produced by laser breakdown chemical vapor deposition and ion implantation

Description: Thin films produced by laser breakdown chemical vapor deposition from nickel and iron carbonyls and by implanting Ni foils with varying levels of C have been characterized by transmission electron microscopy. Decomposition of Ni(CO)/sub 4/ produces polycrystalline films of fcc Ni and metastable ordered hexagonal Ni/sub 3/C. This metastable phase is identical to that produced by gas carburization, rapid solidification of Ni-C melts, and ion implantation of C into Ni at low concentrations. Increa… more
Date: January 1, 1986
Creator: Menon, S. K.; Jervis, T. R. & Nastasi, M.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Mechanisms for the deposition of thin metallic films by laser driven gas phase reactions

Description: Gas phase processing makes laser deposition over large areas possible but homogeneous nucleation of large atomic clusters must be avoided if films are to be produced. Clusters can be highly variable in size from a few atoms to significant fractions of a micrometer. If conditions do not allow for complete quenching of the clusters produced in the gas phase, these clusters can arrive at the substrate with sufficient energy to self sinter into homogeneous films which are substantially different fr… more
Date: January 1, 1986
Creator: Jervis, T. R.; Menon, S. K.; Joyce, E. L. & Carroll, D. W.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Modeling the Behavior of Optical Elements in Radiation Environments

Description: Calculation of heating caused by the deposition of x-rays in thin film optical elements is complicated because the mean free path of photo and autoionization electrons is comparable to the thin film thickness and thus the electron deposition cannot be considered local. This paper describes the modeling in a 1-D code of: (a) x-ray deposition and transport; (b) electron production, deposition and transport; and (c) thermal conduction and transport. X-ray transport is handled by multigroup discret… more
Date: November 3, 1986
Creator: Barlow, T. A.; Rhoades, C. E. Jr.; Merker, M. & Triplett, J. R.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Formation of submicron metastable phase structures in alloys with focused electron or proton beams. [Ni-Al]

Description: Recent theoretical and experimental studies of radiation-induced segregation in alloys under irradiation with focused charged-particle beams have shown that point-defect currents generated by axial and radial displacement-rate gradients can cause significant redistribution of the alloying elements within the irradiated zone. In the case of irradiation of thin films with highly-focused electron beams, two important features have been established experimentally: (1) the diameter of the local regi… more
Date: November 1, 1986
Creator: Lam, N.Q.; Okamoto, P.R. & Leaf, G.K.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
open access

Experimental thin film deposition and surface analysis techniques

Description: An attempt has been made to present some of the thin-film deposition and surface analysis techniques which may be useful in growing superionic conducting materials. Emphasis is made on the importance of being careful in selecting process parameters and materials in order to produce films with properties outlined in this article. Also, special care should be given to proper consideration of grain boundary effects.
Date: January 1, 1986
Creator: Collins, W.E. & Rambabu, B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
Back to Top of Screen