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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Electron microscope, electron diffraction, and electron microprobe analysis of defective solid state weldment on liquid hydrogen tank from Apollo 12 fuel cell system
The beta-SiC(100) surface has been studied by low energy electron diffraction, Auger electron spectroscopy, high resolution electron energy loss spectra (HREELS), and core level excitation EELS. Two new Si-terminated phases have been discovered, one with (3 x 2) symmetry, and the other with (2 x 1) symmetry. Models are presented to describe these phases. New results, for the C-rich surface, are presented and discussed. In addition, core level excitation EELS results are given and compared with theory.
Thin film sandwich Ag/Ni/Cu, demonstrating multiple electron diffraction
Selected-area small angle electron diffraction using double-condenser electron microscope, noting high resolution power
Electron diffraction patterns of olivine and enstatite as control study for Venus Fly Trap rocket experiments
Low energy electron diffraction research of chemical interactions of gases with single crystal metal surfaces, and gas adsorption on nickel and tungsten surfaces
Inelastic scattering of electrons by surface plasma oscillation for low energy electron diffraction and photoemission, interpreting surface plasmon excitation
Mixtures of hexagonal and cubic cadmium sulphide analyzed by electron diffraction of polycrystalline material
Bethe theory of low energy electron diffraction applied to computation of diffracted beam intensity as function of wavelength
Low-energy electron diffraction study of initial oxidation product in oxidation of tantalum
Critique of paper on electron diffraction study of Ce adsorption on W surface, discussing electron work function changes and data discrepancies
Electron diffraction and photoelectric study of crystal surface structure stability of tantalum subjected to ion bombardment and heat treatment
Estimation of hexagonal cadmium sulfide in mixtures with cubic form obtained by reflection electron diffraction of polycrystalline material
Low energy electron diffraction study of oxygen adsorption on molybdenum /111/ surface
Epitaxial growth of indium antimonide thin films as studied in situ by electron diffraction
Report describes experiments that used reflection high-energy-electron diffraction (RHEED) to investigate behavior of GaAs surfaces during and after growth by molecular-beam epitaxy (MBE). Experimental results show dynamic RHEED measurements useful both as probes of surface and growth kinetics and as methods for determining and reproducing surface and growth conditions.
A video-based analysis system for reflection high-energy electron diffraction (RHEED) is described which simultaneously measures the intensities and profiles of multiple diffraction beams. This system is used to record real-time RHEED intensity oscillations for layer-by-layer epitaxial growth. Fast Fourier transform analysis of the oscillation data is used to directly determine the growth rate and to accurately obtain phase information about the oscillations. This system is demonstrated and compared to other methods of recording RHEED oscillation data.
Noble gas isotopic signatures and X-ray and electron diffraction characteristics of Tagish Lake indicate that it is a unique carbonaceous chondrite rich in saponite, Fe-Mg-Ca carbonate, primordial noble gases, and presolar grains. Additional information is contained in the original extended abstract.