Gasentladungstabellen

Knoll, M.; Ollendorff, F.; Rompe, R.; Robinson, H. R.

doi:10.1021/j150366a024

Cited by 12 publications

(5 citation statements)

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“…Related results for the surface electric porosity were obtained earlier in [75]- [78] in connection with studies of grids in vacuum tubes.…”

Section: B Larger Aperturessupporting

confidence: 66%

Average Transition Conditions for Electromagnetic Fields at a Metascreen of Vanishing Thickness

Kuester¹,

Liu²,

J.³

2019

Preprint

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Using a dipole interaction model, we derive generalized sheet transition conditions (GSTCs) for electromagnetic fields at the surface of a metascreen consisting of an array of arbitrarily shaped apertures in a perfectly conducting screen of zero thickness. Use of the GSTCs permits modeling of structures containing perforated surfaces much more rapidly than is possible with full-wave numerical simulations. These conditions require that the period of the array be smaller than about a third of a wavelength in the surrounding media, and generalize many results previously presented in the literature. They are validated by comparison with results of finite-element modeling, and show excellent agreement when conditions of their derivation are satisfied.

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“…Related results for the surface electric porosity were obtained earlier in [75]- [78] in connection with studies of grids in vacuum tubes.…”

Section: B Larger Aperturessupporting

confidence: 66%

Average Transition Conditions for Electromagnetic Fields at a Metascreen of Vanishing Thickness

Kuester¹,

Liu²,

J.³

2019

Preprint

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“…Contrary to the well-known one avalanche channel propagation of a "normal spark" (Raether [llJ), no electron avalanche is observed in our case. This experimental result and the low values of c~ [12] in the pseudo-spark pressure region (1/c~ >>d) lead to the assumption that the discharge is characterized by the existence of normal electron impact ionization in the gas and the emission of electrons from the cathode following ion impact. Such a discharge mechanism is well-known in the case of the development of Townsend's glow discharge.…”

Section: ~E Threshold Voltagementioning

confidence: 97%

Production of high current particle beams by low pressure spark discharges

1979

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On the basis of low pressure spark discharges a new type of a particle accelerator as been developed. It produces pulsed ion as well as electron beams of high intensities in a gas atmosphere at pressures of the order of 1 mbar. The method was used to produce in hydrogene at particle energies of about 70 keV an electron beam with a current density of more than 106A/cm 2 at 140A total current. It is shown that magnetic confinement by the pinch effect takes place in the discharge. Discharge times smaller than 5 ns and spark frequencies up to 2 MHz can be obtained.

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“…with ɣ A,B and ɣ s being the surface tensions of polymer A or B, respectively, and the surface free energy of the substrate s. [43] A smaller value of ∆ɣ A-s then refers to favorable enthalpic interactions with the substrate. [42,90,91] Comparing the energy differences between each polymer species and the substrate, one can differentiate between the wetting categories:…”

Section: Optimising Surface Wetting Preferencesmentioning

confidence: 99%

Nanoscale Block Copolymer Self‐Assembly and Microscale Polymer Film Dewetting: Progress in Understanding the Role of Interfacial Energies in the Formation of Hierarchical Nanostructures

Lindner

2019

Adv Materials Inter

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Block copolymer (BCP) self‐assembly (SA) can be exploited for next‐generation lithography for the advanced nanopatterning of surfaces with versatile nanoscale features. To render BCP‐SA suitable for the creation of tailored surface patterns, a fundamental understanding of interfacial interactions is crucial. This progress report gives an overview on the interplay of BCP microscale film thickness modulation and nanoscale microphase separation during BCP‐SA. Light is shed on the role of interfacial energies in both events. Microscale processes determining the topography of BCP films, i.e., hole/island formation and dewetting into droplets, are presented. Nanoscale microphase separation into energetically favorable pattern orientations in dependency on the polymer film thickness and influenced by surface polarities are discussed critically. Finally, examples are shown in which the combination of microscale dewetting and nanoscale microphase separation are exploited to create hierarchical nanostructures from BCPs. An outlook is given presenting successful applications of both mechanisms on prepatterned surfaces in order to control position and morphology of the hierarchical nanostructures. This approach is particularly promising for the creation of advanced surface architectures.

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Gasentladungstabellen

Cited by 12 publications

References 0 publications

Average Transition Conditions for Electromagnetic Fields at a Metascreen of Vanishing Thickness

Average Transition Conditions for Electromagnetic Fields at a Metascreen of Vanishing Thickness

Production of high current particle beams by low pressure spark discharges

Nanoscale Block Copolymer Self‐Assembly and Microscale Polymer Film Dewetting: Progress in Understanding the Role of Interfacial Energies in the Formation of Hierarchical Nanostructures

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