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  • 1
    Electronic Resource
    Electronic Resource
    Atomic forces between noble gas atoms, alkali ions, and halogen ions for surface interactions (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 929-937 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The components of the physical forces between noble gas atoms, alkali ions, and halogen ions are analyzed and a data base developed from analysis of the two-body potential data, the alkali–halide molecular data, and the noble gas crystal and salt crystal data. A satisfactory global fit to this molecular and crystal data is then reproduced by the model to within several percent. Surface potentials are evaluated for noble gas atoms on noble gas surfaces and salt crystal surfaces with surface tension neglected. Within this context, the noble gas surface potentials on noble gas and salt crystals are considered to be accurate to within several percent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455161
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    Paper (German National Licenses)
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  • 2
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    Atomic forces between noble gas atoms, alkali ions, and halogen ions for surface interactions (1988)
    American Institute of Physics
    Details
    Publication Date: 1988-07-15
    Print ISSN: 0021-9606
    Electronic ISSN: 1089-7690
    Topics: Chemistry and Pharmacology , Physics
    Published by American Institute of Physics
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    PAPER CURRENT
  • 3
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    Oxygen transport through high-purity, large-grain Ag (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The permeability of oxygen through pure, large-grain Ag membrames has been found to be linear and repeatable over the 400-800 C range, but only at a magnitude that is a factor of 3.2 smaller than ascribed by prior research. AES data indicate the pertinence of grain-boundary considerations, due to the virtual undetectability of intragranular oxygen. Vacuum-desorption of oxygen-saturated Ag is found to occur at the critical temperature of 630 C; this is consistent with the increased mobility of oxygen atoms in the higher temperature regime.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Journal of Materials Research (ISSN 0884-2914); 3; 1378-138
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Atomic forces between noble gas atoms, alkali ions, and halogen ions for surface interactions (1988)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: The components of the physical forces between noble gas atoms, alkali ions, and halogen ions are analyzed and a data base developed from analysis of the two-body potential data, the alkali-halide molecular data, and the noble gas crystal and salt crystal data. A satisfactory global fit to this molecular and crystal data is then reproduced by the model to within several percent. Surface potentials are evaluated for noble gas atoms on noble gas surfaces and salt crystal surfaces with surface tension neglected. Within this context, the noble gas surface potentials on noble gas and salt crystals are considered to be accurate to within several percent.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Journal of Chemical Physics (ISSN 0021-9606); 89; 929-937
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Continuous electron stimulated desorption using a ZrO2/Ag permeation membrane (1989)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: During the development of an atomic oxygen beam generator for laboratory simulation of the atmospheric conditions in low earth orbit, a new technique for performing electron stimulated desorption (ESD) in a continuous manner has been developed. In this technique, oxygen permeates through an Ag membrane at elevated temperature thereby providing a continuous supply of oxygen atoms to the 1000-A ZrO2 coating at the vacuum interface. ESD then results in a large peak of neutral O2 molecules which ultimately decay into steady-state desorption. The ESD signal is linear with respect to primary beam flux (0.035 O2 molecules per electron at a primary beam energy of 1 keV) but nonlinear with respect to primary beam energy.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: Journal of Vacuum Science and Technology A (ISSN 0734-2101); 7; 2087-208
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Refined potentials for rare gas atom adsorption on rare gas and alkali-halide surfaces (1985)
    In:  Other Sources
    Details
    Publication Date: 2018-12-01
    Description: The utilization of models of interatomic potential for physical interaction to estimate the long range attractive potential for rare gases and ions is discussed. The long range attractive force is calculated in terms of the atomic dispersion properties. A data base of atomic dispersion parameters for rare gas atoms, alkali ion, and halogen ions is applied to the study of the repulsive core; the procedure for evaluating the repulsive core of ion interactions is described. The interaction of rare gas atoms on ideal rare gas solid and alkali-halide surfaces is analyzed; zero coverage absorption potentials are derived.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
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    NASA TECHNICAL REPORTS
  • 7
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    Permeation of oxygen through high purity, large grain silver (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The permeation of high purity, large grain Ag membranes by oxygen has been studied over the temperature range 400 to 800 C. The permeability was found to be quite linear and repeatable, but the magnitude was 3.2 times smaller than that determined by past research. Since previous investigators studied substantially less pure Ag and conducted experiments within much poorer vacuum environments (which indicates that their grain boundary density was much greater), the data presented here suggest oxygen transport through the membrane is primarily by grain boundary diffusion. The diffusivity measurements were found to exhibit two distinct linear regions, one above and one below a critical temperature of 630 C. The high-temperature data have an activation energy (11.1 kcal/mole) similar to that reported by others, but the low-temperature data have a higher activation energy (15.3 kcal/mole), which can be explained by impurity trapping in the grain boundaries. Vacuum desorption of the oxygen-saturated Ag was found to occur at a threshold of 630 C, which is consistent with the onset of increased mobility within the grain boundaries.
    Keywords: METALLIC MATERIALS
    Type: NASA-TP-2755 , L-16305 , NAS 1.60:2755
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 8
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    Analysis of the physical atomic forces between noble gas atoms, alkali ions and halogen ions (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The physical forces between atoms and molecules are important in a number of processes of practical importance, including line broadening in radiative processes, gas and crystal properties, adhesion, and thin films. The components of the physical forces between noble gas atoms, alkali ions, and halogen ions are analyzed and a data base for the dispersion forces is developed from the literature based on evaluations with the harmonic oscillator dispersion model for higher order coefficients. The Zener model of the repulsive core is used in the context of the recent asymptotic wave functions of Handler and Smith; and an effective ionization potential within the Handler and Smith wave functions is defined to analyze the two body potential data of Waldman and Gordon, the alkali-halide molecular data, and the noble gas crystal and salt crystal data. A satisfactory global fit to this molecular and crystal data is then reproduced by the model to within several percent. Surface potentials are evaluated for noble gas atoms on noble gas and salt crystal surfaces with surface tension neglected. Within this context, the noble gas surface potentials on noble gas and salt crystals are considered to be accurate to within several percent.
    Keywords: METALLIC MATERIALS
    Type: NASA-TP-2568 , L-16093 , NAS 1.60:2568
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 9
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    Growth of high-quality thin-film Ge single crystals by plasma-enhanced chemical vapor deposition (1986)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: Thin-film Ge single crystals (approx. 10 microns) have been epitaxially grown on polished NaCl(100) substrates at 450C by using plasma-enhanced chemical vapor deposition. Films on approximately 1 sq cm and larger were separated from the NaCl by either melting the salt or by differential shear stress upon cooling to room temperature. The ordered growth of the Ge was found to be most sensitive to the initial plasma power and to the continuum flow dynamics within the carbon susceptor. The films were visually specular and exhibited a high degree of crysalline order when examined by X-ray diffraction. The films were found to be p-type with a carrier concentration of approximately 3 x 10 to the 16th power/cu cm, a resistivity of 0.11 ohm-cm, and a Hall hole mobility of 1820 sq cm/v/s at room temperature. Vacuum firing minimized the primary contaminant, Na, and corresponding lowered the carrier concentration to 4 x 10 to the 14th power/cu cm.
    Keywords: ENGINEERING (GENERAL)
    Type: NASA-TP-2532 , L-16011 , NAS 1.60:2532
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 10
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    Electron stimulated desorption of atomic oxygen from silver (1987)
    In:  CASI
    Details
    Publication Date: 2019-06-28
    Description: The electron stimulated desorption (ESD) of neutral oxygen atoms from polycrystalline silver and of oxygen ions from Ag(110) has been studied. Polycrystalline Ag charged with (16)O2 and (18)O2 and bombarded by low-energy electrons (approx 100 eV) under ultrahigh vacuum (UHV) conditions emitted O atom flux levels of 1 x 10 to the 12th power/sq cm/s at a Ag temperature of 300 C. The flux was detected with a quadrupole mass spectrometer operating in the appearance potential mode. The neutral cross section at about 100 C was determined to be 7 x 10 to the -19 sq cm. Ancillary experiments conducted in a UHV chamber equipped with a cylindrical mirror analyzer and rigged for ion energy distribution and ion angular distribution were used to study O ions desorbed from Ag(110). Two primary O(+) energies of 2.4 and 5.4 eV were detected from the Ag(110) after having been dosed with 2500 L of (16)O2. It also appears that in both experiments there was strong evidence for directionality of the emitted flux. The results of this study serve as a proof of concept for the development of a laboratory atomic oxygen beam generator that simulates the gas flux environment experienced by orbiting vehicles.
    Keywords: INORGANIC AND PHYSICAL CHEMISTRY
    Type: NASA-TP-2668 , L-16225 , NAS 1.60:2668
    Format: application/pdf
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