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Showing 1 to 20 of 28 for “"rare gases"”.
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Transient Rydberg Absorption Spectroscopy of Electron Beam Excited Rare Gases
… in the ultraviolet, visible, and near infrared (220 (LESSTHEQ) (lamda) (LESSTHEQ) 900 nm) spectral regions have been observed in electron beam exci- ted rare gases. The most prominent molecular bands for He(,2), Ne(,2),
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Properties of a high-current discharge in alkali-metal-seeded rare gases.
… consisting of a hot, atmospheric-pressure rare gas (the "diluent") to which a small amount of alkali metal vapour has been added as an easily-ionised "seed". It is shown that the establishment of the discharge under study is brought about by the breakdown of the gas, which occurs at a …
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Surface Reflectance Studies of Rare Gases Adsorbed on Metal and Oxide Surfaces
Made available in DSpace on 2015-05-13T15:22:17Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 8009047.PDF: 5058317 bytes, checksum: a4f6e346c65fb9ed905f1f38e26c6273 (MD5) Previous issue date: 1979
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Experimental study of rare-gases excimer VUV system and H2 Lyman-bands calibration
An electron impact rare gas excimer vacuum ultra-violet experimental system is custom-designed and tested using an argon and H2 mixture. An electron flooding system, i.e. filament, is used as the hot electron source. A SiNx membrane is applied as the entrance foil separating the high vacuum chamber …
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Surface reflectance core spectroscopy of halogens, rare gases, alkalis and CO on metal surfaces
Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-06-28T15:03:36Z No. of bitstreams: 1 1980_cunningham.pdf: 5039429 bytes, checksum: 6a907df332d48a6816d0e9530d260918 (MD5)
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Surface Reflectance Core Spectroscopy of Halogens, Rare Gases, Alkalis and Carbon-Monoxide on Metal Surfaces
Reflectivity spectra for the halogens, rare gases, alkalis and the CO molecule adsorbed on metal and insulating surfaces are described. This research employed synchrotron radiation in the energy range from 4 to 20 eV, using both s and p polarized light. Results for adsorbates in three neighboring …
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Close-Coupling and Coupled States Scattering Calculations Applied to Collisions of Methane With Rare Gases
Close-coupling and coupled states scattering calculations are applied to helium methane and neon-methane collisions. State-to-state and total differential cross sections calculated in the coupled states approximation are found to be in at least rough qualitative agreement with the close-coupling …
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The Dynamics of Gas-Surface Energy Transfer in Collisions of Rare Gases with Organic Thin Films
… these questions by scattering high-energy, rare gas atoms from functionalized self-assembled monolayers. We used classical trajectory simulations to investigate the atomic-level details of the scattering dynamics. We find that approximately six to ten carbon atoms are involved in impulsive …
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Computational Study of Low-friction Quasicrystalline Coatings via Simulations of Thin Film Growth of Hydrocarbons and Rare Gases
… thin films growth of selected hydrocarbons and rare gases on a decagonal Al$_{73}$Ni$_{10}$Co$_{17}$ quasicrystal (d-AlNiCo). Grand canonical Monte Carlo method is used to perform the simulations. We develop a set of classical interatomic many-body potentials which are based on the embedded-atom …
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Identification of metal-organic framework materials for adsorptive separation of the rare gases: applicability of IAST and effects of inaccessible regions
A collection of >3000 MOFs with experimentally confirmed structures were screened for performance in three binary separations: Ar/Kr, Kr/Xe, and Xe/Rn. 70 materials were selected for further analysis, and calculations were performed to account for inaccessible regions. Single component GCMC …
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CARS studies of the quenching of excited sulfur atoms by rare gases: Fine structure selectivity in electronic-to-translational energy transfer
… sulfur to the $\sp3P$ term by collision with the rare gases argon, krypton, and xenon gives clear kinetic and spectral evidence of a population inversion between the $\sp3P\sb0$ and $\sp3P\sb2$ fine-structure levels. Kinetic data indicate no such inversion between the $\sp3P\sb1$ and $\sp3P\sb2$ …
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High vacuum system and instrumentation for measuring the derivative of the current-voltage characteristic of a Langmuir probe
… to determine the electron speed distribution in rare gases. The theory behind using a lock-in amplifier differentiator to obtain the derivative of the I-V characteristic of a Langmuir Probe is derived and discussed. A test was devised to check the instrumentation for correct operation.
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Optical Excitation of Metastable Krypton and Photoassociative Spectroscopy of Ultracold RbAr
… krypton. The high energies required to excite rare gases out of their ground state present a unique challenge in the context of laser experiments. Laser physics work with rare gases often relies on excitation within an RF discharge. All-optical excitation is a promising replacement for RF …
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Electron Ionization and Excitation Coefficients for Argon, Krypton, and Xenon in the Low E/p Region and Kinetics of Interhalogen Diatomics
… due to photoelectric emission attributed to the rare gas metastables. Using this information a revised set of self-consistent near threshold inelastic cross sections for each rare gas studied was determined. Experiments aimed at trying to measure the electron excitation cross sections from the …
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High intensity femtosecond enhancement cavities
… radiation via high harmonic generation (HHG) in rare gases, light intensities in excess of 1014 W/cm 2 are required. Usually such high intensity are obtained by parametric amplification of laser pulses, which in turn reduces the pulse repetition rate to a few kHz. Given that the HHG process is …
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Interactions of intense optical and extreme-ultraviolet lasers with atoms and solids
… of two-color above-threshold ionization in rare gases. The intense extreme-ultraviolet (EUV) radiation from FLASH was combined with an intense synchronized optical laser (800 nm, 4 ps). The photoelectron spectrum revealed one strong photoline attributed to the one-photon direct ionization of …
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Photodesorption of gases from metal and semiconductor surfaces
… to measure. The photodesorbed fluxes of residual gases appear to follow Langmuir isotherms in their dependence on ambient vacuum conditions. In the one case of rare gases on aluminum, for which measurements were made on a freshly doped clean surface, no photodesorption could be observed. The …
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Ankunftszeitbestimmung ultrakurzer XUV Pulse von FLASH durch Kreuzkorrelation mit ultrakurzen NIR Pulsen
… is based on ion time-of-flight spectra of rare gases. The NIR radiation is capable of further ionizing rare gas ions produced by the XUV radiation of FLASH. A delay dependent NIR-induced enhancement of the ion yield should become apparent. Using both pulses, a NIR-induced signal enhancement …
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Experimental examination of ionization processes of noble gases in strong laser fields
… the processes underlying the ionization of rare gases. The focus is on double ionization, especially at intensities, which produce rescattered electrons too slow for ionization. Our experimental approach is to record the ions time of flight and simultaneously the doubly differential momentum …
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Excited-State Magnesium-Rare Gas Optical Collisions
… magnesium (3s3p <sup>1</sup>P<sub>1</sub>) - rare gas optical collisions. The magnesium was excited by a linearly polarized laser tuned to the 3s<sup>2</sup>1s<sub>0</sub> → 3s3p <sup>1</sup>P<sub>1</sub> atomic transition at 285 nm. A second linearly polarized laser was tuned near the 3s3p …
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