Electron-temperature dependence of the recombination of H3O+(H2O)<i>n</i> ions with electrons

Johnsen, Rainer

doi:10.1063/1.464911

Cited by 50 publications

(49 citation statements)

References 17 publications

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“…The rate constants of the DR reactions are on the order of ≈10 −5 –10 −8 cm 3 · s −1 depending on the electron temperature, size of water clusters and the gas pressure 32–34. Thus, the increase in the water level can partly explain the decrease of the electron density in DBD plasmas.…”

Section: Resultsmentioning

confidence: 99%

Influence of the Gas Humidity on the Uniformity of RF‐Powered Atmospheric‐Pressure Low‐Temperature DBD Plasmas

Koo

Cho

2008

Plasma Processes & Polymers

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The effect of the water level in a He working gas on the uniformity of the atmospheric pressure plasmas was investigated using emission spectroscopy. The 13.56 MHz rf‐powered dielectric barrier discharges were generated using He gas, in which water vapor of various concentrations was added. Electron density of the discharge medium determined using the emission spectra clearly demonstrated that the humidity level affects the electron density and the uniformity of the plasma.

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Section: Resultsmentioning

confidence: 99%

Influence of the Gas Humidity on the Uniformity of RF‐Powered Atmospheric‐Pressure Low‐Temperature DBD Plasmas

Koo

Cho

2008

Plasma Processes & Polymers

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“…The temperature dependence of the recombination rate can be found by noting that the dominant positive ions in the lower ionosphere (z < 85 km) are water cluster ions H + (H 2 O) n . Their electron-ion recombination rate a depends on the number of water molecules in the cluster, with an average value given by [Gurevich, 1978;Johnsen, 1993] a ¼ a 0 300K=T e ð Þ 0:6 ; a 0 ¼ 2:5 Â 10 À6 cm 3 =s ð2Þ…”

Section: Efficiency Enhancement Physicsmentioning

confidence: 99%

Enhanced ionospheric ELF/VLF generation efficiency by multiple timescale modulated heating

Milikh

Papadopoulos

2007

Geophysical Research Letters

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[1] It is shown theoretically that for high power HF ionospheric heaters, such as the current HAARP heater, the HF to VLF conversion can increase significantly by using a two-timescale heating. A long heating pulse, t p % 1 minute, is followed over the same timescale period by modulation at the desired ELF/VLF frequency. The long pulse reduces the electron-ion recombination coefficient, resulting in increased ambient electron density and current density. The efficiency increases due to the increase in the current density over the time t p . Besides, the more efficient heating results from sharpening of the ambient density profile at the modified height that reduces low altitude self-absorption. It is shown that following the long preheating pulse by amplitude modulated heating at VLF frequencies can result in efficiency increase of up to 7 dB over the non-preheated case. In addition to the theory the letter describes proof-ofprinciple experiments using the completed HAARP.

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“…Under these conditions the electron density initially decreases by a factor of ten through the dissociative recombination with O + 4 ions e + O + 4 → 2O 2 Figure 2. The rate coefficients for electron recombination with O + 2 [18], N + 2 [18], O + 4 [18] and H 3 O + (H 2 O) 3 [19] versus electron temperature.…”

Section: The Streamer In Long Air Gaps Under Standard Conditionsmentioning

confidence: 99%

“…The rate of electron recombination with H 3 O + (H 2 O) 3 ions is greater than that with O + 4 ions [18,19] (see figure 2). The acceleration of the plasma decay in the humid air decreases the conductivity of the streamer channel and as a consequence the electric field at the streamer head is reduced.…”

Section: The Effect Of Humiditymentioning

confidence: 99%

Ionization processes in spark discharge plasmas

Aleksandrov

Bazelyan

1999

Plasma Sources Sci. Technol.

106

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The dominant mechanisms of electron generation and loss during different phases of spark discharge are considered. The focus is on spark formation in long non-uniform-field air gaps through leader and streamer processes. The streamer development in dry air and the effects of humidity, temperature and density on the properties of a long positive streamer in air are discussed. The ionization kinetics in the leader channel in long air gaps is described. The ionization mechanisms which lead to the re-breakdown within a post-arc air channel and to the streamer breakdown in undisturbed air and in Ar are presented.

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Electron-temperature dependence of the recombination of H3O+(H2O)n ions with electrons

Cited by 50 publications

References 17 publications

Influence of the Gas Humidity on the Uniformity of RF‐Powered Atmospheric‐Pressure Low‐Temperature DBD Plasmas

Influence of the Gas Humidity on the Uniformity of RF‐Powered Atmospheric‐Pressure Low‐Temperature DBD Plasmas

Enhanced ionospheric ELF/VLF generation efficiency by multiple timescale modulated heating

Ionization processes in spark discharge plasmas

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