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15 Jun 1985

Volume 46, Issue 12, pp. 1117-1189

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Critical currents and flux cutting in thin superconducting films

M. G. Blamire and J. E. Evetts

Appl. Phys. Lett. 46, 1181 (1985); http://dx.doi.org/10.1063/1.95697 (3 pages) | Cited 9 times

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Experiments have been performed on thin films with the magnetic field applied parallel to the sample current (the force‐free state). Plots of the flux‐flow critical current versus magnetic field show a pronounced temperature independent structure which is sensitive to the film thickness. This structure is interpreted in terms of flux vortex arrangements that are matched to the sample geometry. A flux‐cutting model for the dynamic behavior of vortices in this system is proposed and shown to be in qualitative agreement with the results.
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74.78.-w Superconducting films and low-dimensional structures
74.25.Sv Critical currents
74.25.Op Mixed states, critical fields, and surface sheaths
74.25.N- Response to electromagnetic fields
74.25.-q Properties of superconductors

Laser‐initiated microchemistry: Dynamic probes of metallopolymer thin‐film decomposition

G. J. Fisanick, J. B. Hopkins, M. E. Gross, M. D. Fennell, and K. J. Schnoes

Appl. Phys. Lett. 46, 1184 (1985); http://dx.doi.org/10.1063/1.95698 (3 pages) | Cited 20 times

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Transient absorption has been used as a probe of the reaction kinetics in the laser‐initiated thermal decomposition of Au metallopolymers. Feature sizes are considerably larger than the dimensions of the laser spot due to the propagation of a reaction front driven by the heat release from the highly exothermic reaction. Front velocities in the range of 30–50 cm/s are measured using spatially separated generating and probe lasers. These effects should be generalizable to any laser‐driven thermal reaction in the condensed phase with sufficient heat release, and, as such, constitute a major limitation on feature size obtainable in these systems.
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79.20.Ds Laser-beam impact phenomena
82.30.Lp Decomposition reactions (pyrolysis, dissociation, and fragmentation)
68.60.-p Physical properties of thin films, nonelectronic
82.50.Hp Processes caused by visible and UV light

Reactions of XeF2 chemisorbed on Si(111) 7×7

B. Roop, S. Joyce, Jocelyn C. Schultz, N. D. Shinn, and J. I. Steinfeld

Appl. Phys. Lett. 46, 1187 (1985); http://dx.doi.org/10.1063/1.95699 (3 pages) | Cited 25 times

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The stable overlayer composition resulting from dissociative chemisorption of XeF2 on the Si(111)7×7 surface has been studied by x‐ray photoelectron spectroscopy and thermal desorption spectrometry. Evidence is found for the existence of fluorine covalently bonded in the bulk; no evidence for unreacted interstitial fluorine is found.
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82.65.+r Surface and interface chemistry; heterogeneous catalysis at surfaces
81.65.-b Surface treatments
33.60.+q Photoelectron spectra
68.03.Fg Evaporation and condensation of liquids
68.43.Mn Adsorption kinetics
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