High voltage electron microscopy and electron diffraction of lunar pyroxenes
Apollo 11 lunar rock pyroxenes, examining band structure and magnetic ordering by high voltage electron microscopy and electron diffraction
Fernandez-Moran, H.↗
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Interaction between an electron wave and an ion wave due to scattering by electrons
Electron-ion wave interaction due to scattering by electrons, using kinetic wave equation to describe wave-particle interaction
Nishikawa, K.↗
Reduction and analysis of two sets of electron content measurements permitting the inference of electron density in the solar wind Final report
Reduction and analysis of electron content measurements permitting inference of electron density in solar wind
Croft, T. A.↗
Electron wave instabilities in a magnetoplasma caused by electron-neutral collisions
Electron wave instabilities in non-Maxwellian Lorentz magnetoplasma caused by electron-neutral collisions
Howell, J. Q.↗
Absolute efficiency measurements for channel electron multipliers utilizing a unique electron source
Electron accelerator with broad stable beam for calibration of spectrometers and channel electron multipliers
Chappell, C. R.↗
The emission and propagation of approximately 40 keV solar flare electrons. II - The electron emission structure of large active regions
Emission structure of large electron active region McMath plage 8905 mapped by 40 keV solar flare electrons
Lin, R. P.↗
Examination of Surveyor 3 parts with the scanning electron microscope and electron microprobe
Two screws and two washers, several small chips of tubing, and a fiber removed from a third screw were examined with the scanning electron microscope and the electron microprobe. The purpose of the examination was to determine the nature of the material on the surface of these samples and to search for the presence of meteoritic material.
Chodos, A. A.↗
Detection of interplanetary electrons from 18 keV to 1.8 MeV during solar quiet times, 1. On the origin of 200 KeV interplanetary electrons, 2.
A quiet time component of interplanetary electrons having energies above solar wind energies and below those characterized as cosmic radiation was observed. Its energy spectrum falls with energy from 18 keV to 1.8 MeV, but it shows a feature in the 100 to 300 keV range. The observed temporal variations of the intensity suggest that the 18 to 100 keV portion is solar and the 0.3 to 1.8 MeV portion is galactic in origin. Solar and terrestrial neutron decay electrons appear inadequate to explain the 100 to 300 keV feature.
Lin, R. P.↗
High voltage electron microscopy and electron diffraction of pyroxenes in type B lunar samples from Apollo 11
Lunar pyroxene 10044 specimens cleaved and sectioned by diamond knife ultramicrotomy were examined by standard (75 to 100 kV) and high voltage (200 kV) electron microscopy and diffraction. Salient findings based on evaluation of 2000 plates show uniform 300 to 600 A-wide bands, probably corresponding to single crystal domains, with lattice spacings of 2. A High resolution bright and dark field images of iron-rich and magnesium-rich crystals were compared with corresponding electron diffraction patterns. Possible relations of observed structures to magnetic domains were considered.
Fernandez-Moran, H.↗
Photodetachment of electrons from phosphide ion - The electron affinity of PH2.
Measurement of the relative cross section for photodetachment of electrons from PH2(-) in the wavelength region 725 to 1020 nm (1.71 to 1.22 eV). An ion cyclotron resonance spectrometer was used to generate, trap, and detect the negative ions, and two light sources were employed to study photodetachment: a 1000-W xenon arc lamp with a grating monochromator and a continuously tunable laser. A single sharp threshold in the cross-section curve was observed, and a detailed analysis yielded an electron affinity value of 1.25 plus or minus 0.03 eV.
Smyth, K. C.↗
Photodetachment of electrons from amide and arsenide ions - The electron affinities of NH2., and AsH2.
The relative cross section for the gas-phase photodetachment of electrons has been determined for NH2(-) in the wavelength region of 1195 to 1695 nm and for AsH2(-) in the region from 620 to 1010 nm. An ion cyclotron resonance spectrometer was used to generate, trap, and detect negative ions. A 1000-W xenon arc lamp with a grating monochromator was used as the light source, except for one series of experiments in which a tunable laser was employed. Single sharp thresholds were observed in both cross sections, and the following electron affinity values were determined: 0.744 (plus or minus 0.022) eV for NH2. and 1.27 (plus or minus 0.03) eV for AsH2.
Smyth, K. C.↗
Photodetachment of an electron from selenide ion - The electron affinity and spin-orbit coupling constant for SeH.
The relative cross section for the gas phase photodetachment of an electron from SeH(-) was determined in the wavelength region 428 to 578 nm. An ion cyclotron resonance spectrometer was used to generate, trap, and detect the negative ions, and a 1000-W xenon arc lamp with a grating monochromator was employed as the light source. The cross section exhibited two sharp thresholds, whose positions remained unchanged for the photodetachment of SeD(-). As a result of these thresholds, the electron affinity and the spin-orbit coupling constant were evaluated.
Smyth, K. C.↗
Use of photoelectronic image formation devices (electron photography, electron optical converters, television)
Electronic image amplification methods are used in variable star observations to increase significantly the volume of recorded information. Electronic cameras are the most efficient, while television cameras increase contrast of weak stars against the background of the sky.
Prokofyeva, V. V.↗
Preliminary results from the first satellite of a high-resolution germanium gamma-ray spectrometer: Backgrounds from electron bremsstrahlung and from electron-positron annihilation
Detailed data are presented on the bremsstrahlung backgrounds measured by a satellite-borne high resolution Ge(Li) gamma ray spectrometer. Two bremsstrahlung classes were discussed: (1) those arising from radiation belt electrons stopping in the vicinity of the spectrometer, and (2) bremsstrahlung produced by electrons precipitating into the earth's atmosphere.
Imhof, W. L.↗
Jupiter radiation belt electrons and their effects on sensitive electronics
Data on the electron environment trapped at Jupiter, tests performed to simulate the effects of electrons on Mariner, Jupiter-Saturn 1977 sensitive parts, and test results from those simulations, are summarized.
Divita, E. L.↗
Investigation of electron dynamics in the magnetosphere with electron beams injected from sounding rockets
This paper describes an empirical study of the basic mechanisms by which electrons precipitate from the geomagnetic field to produce 'auroral X rays' during periods of geomagnetic activity. The study was based on data obtained by the Echo satellites. Echo I, launched in 1970, injected 40 keV, 0.1 amp electron pulses at low latitude (L ? 2.6) and successfully measured the returning pulses from the conjugate region. Electric fields and multiple Coulomb scattering were studied. Echo II, launched in 1972 from high latitude (L ? 8) studied the interaction of the beams with background radiation and the detailed motion of the beams near the rocket. Evidence for a beam plasma instability was obtained. Echo III launched in April 1974, (L ? 5.5) detected a series of conjugate echoes during the presence of a strong convective field in the magnetosphere. It was shown that the electric field measurement in the ionosphere using the incoherent backscatter radar and detectors on the rocket was transferred to the equatorial plane as though field lines were equipotentials.
Winckler, J. R.↗
Study of electronic properties in proton- and electron-irradiated GaAlAs and GaAs solar cell materials
Diagnostical measurement techniques such as dark I-V, C-V, the thermally insulated capacitance, and the deep level transient spectroscopy methods were employed to study defect properties in the proton-irradiated n-GaAs materials. Defect energy levels, thermal emission rates, and capture cross sections of electrons as well as trap densities were deduced from these measurements and the results are presented. Correlations between the measured defect parameters and the dark I-V characteristics of the n-GaAs Schottky barrier diodes are also discussed. Defect energy levels (i.e., electron traps) determined are also compared with published data in order to identify their physical origins.
Li, S. S.↗
Electron, electron-bremsstrahlung and proton depth-dose data for space-shielding applications
A data set has been developed, consisting of depth-dose distributions for omni-directional electron and proton fluxes incident on aluminum shields. The principal new feature of this work is the accurate treatment, based on detailed Monte Carlo calculations, of the electron-produced bremsstrahlung component. Results covering the energy region of interest in space-shielding calculations have been obtained for the absorbed dose (a) as a function of depth in a semi-infinite medium, (b) at the edge of slab shields, and (c) at the center of a solid sphere. The dose to a thin tissue-equivalent detector was obtained as well as that in aluminum. Various results and comparisons with other work are given.
Seltzer, S. M.↗