| Development of Liquid Metal Field-Emission Sources for Use in Fast Repetitive Opening Switches |
JAN 88 |
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| Authors:
Michael J. Coggiola; SRI INTERNATIONAL MENLO PARK CA
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 | Liquid metal field-emission sources appear to have desirable characteristics as the active element of a high-current repetitive switch. The results we obtained indicate that many of the operational parameters of these devices can be controlled, although the mechanisms are not yet understood. In particular, the enhanced mode of operation found for the Gallium/Indium/Argon system gives very large, narrow current pulses by an unknown mechanism. The use of various diagnostics, including ... |
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| Analysis of Middle Distillate Fuels by High Resolution Field Ionization Mass Spectrometry |
MAY 87 |
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| Authors:
Ripudaman Malhotra; Michael J. Coggiola; Steven E. Young; Doris S. Tse; S. E. Buttrill Jr; SRI INTERNATIONAL MENLO PARK CA
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| We have developed an analytical method for the rapid and detailed chemical characterization of distillate fuels using high-resolution field ionization mass spectrometry (HR-FIMS). Field ionization produces only the molecular ions for most compounds and is therefore particularly useful for the analysis. A vintage AEI MS-9 mass spectrometer was refurbished and modified to house an SRI volcano-style field ionizer. By operating the mass spectrometer at a resolving power of 3000, all ... |
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| Production and Properties of Metastable Autodetaching Negative Ions |
20 AUG 85 |
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| Authors:
James R. Peterson; Michael J. Coggiola; SRI INTERNATIONAL MENLO PARK CA
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| Experimental work has been directed primarily determining properties of metastable autodetaching negative ions, with a smaller effort directed to their production in beams, as well as the production and photodetachment of Li(- ) beams. Properties of particular concern were the photodetachment cross sections, energy levels, and autodetachment lifetimes. Detailed studies have been made of resonant structures in the photodetachment of He(-) and Li(-) negative ions. Some previously reported metastable ions ... |
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| Mechanisms of Multiphoton Dissociation of Molecular Ions. |
30 APR 1981 |
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| Authors:
Michael J. Coggiola; James R. Peterson; Philip C. Cosby; Ronald V. Hodges; SRI INTERNATIONAL MENLO PARK CA
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| The dissociation of highly vibrationally excited molecular ions resulting from single infrared photon absorption has been studied. The wavelength dependence of the absorption/dissociation process has been measured, and the photofragments identified. Measurements were also made of the dissociative lifetime following absorption and the photofragment kinetic energy distributions. These measurements show that a strong correlation exists between this single photon dissociation process and the final step of multiphoton dissociation. Based on ... |
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| Inelastic Collisions of Excited Atoms. |
29 APR 1980 |
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| Authors:
Michael J. Coggiola; SRI INTERNATIONAL MENLO PARK CA MOLECULAR PHYSICS LAB
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| The interaction of metastable rare gas atoms with ground state atoms is being investigated in the energy range from several eV to several keV. Emphasis is on collisional ionization and collisional excitation transfer. Additional work examines the details of the charge transfer reaction used to produce the fast metastable beams. (Author) |
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| Mechanisms of Multiphoton Dissociation of Molecular Ions. |
04 DEC 1978 |
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| Authors:
Michael J. Coggiola; J. R. Peterson; SRI INTERNATIONAL MENLO PARK CA
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| The dynamics of multiphoton absorption and dissociation of polyatomic ions will be studied to characterize the details of the process. Ion fragments will be identified and the energy released into translation will be measured using a coaxial laser ion beam spectrometer. Single photon absorption studies of positive and negative polyatomic ions failed to reveal any vibrational absorptions in the infrared region investigated. A single photon electronic transition absorption in O2(+) ... |
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| Inelastic Collisions of Excited Atoms. |
22 NOV 1978 |
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| Authors:
Keith T. Gillen; Michael J. Coggiola; SRI INTERNATIONAL MENLO PARK CA
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| This report describes the development and verification of a technique for optically pumping fast metastable rare gas beams in order to monitor, and then substantially alter, the beam composition. The technique has been successfully applied to a neon metastable beam produced by charge transfer of neon ions in sodium at energies near 1 keV. (Author) |
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Reports by Author
