Messung der Anlagerungswahrscheinlichkeit von Elektronen an Sauerstoff mittels einer Laufzeitmethode

Doehring, A.

doi:10.1515/zna-1952-3-405

Cited by 48 publications

(4 citation statements)

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“…Attachment and ionization coefficients for pure oxygen were measured many times. Our theoretical predictions are in good agreement with most of the experimental data from [100][101][102][103][104][105].…”

Section: Selection Of Cross Sectionssupporting

confidence: 81%

“…The gain increased with energy loading. Attention was drawn to the problem that atomic oxygen, which in contrast to COIL always exists in low-temperature plasma of electric discharge, plays both positive and negative roles in DOIL kinetics [105,188]. Its positive behaviour is the formation of atomic iodine by dissociation of molecular iodine through the reactions ( 12) and (13).…”

Section: Experimental Methods Of Sdo Production In An Electric Dischargementioning

confidence: 99%

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Physics and engineering of singlet delta oxygen production in low-temperature plasma

Ионин

Кочетов

Napartovich

et al. 2007

J. Phys. D: Appl. Phys.

265

190

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An overview is presented of experimental and theoretical research in the field of physics and engineering of singlet delta oxygen (SDO) production in low-temperature plasma of various electric discharges. Attention is paid mainly to the SDO production with SDO yield adequate for the development of an electric discharge oxygen–iodine laser (DOIL). The review comprises a historical sketch describing the main experimental results on SDO physics in low-temperature plasma obtained since the first detection of SDO in electric discharge in the 1950s and the first attempt to launch a DOIL in the 1970s up to the mid-1980s when several research groups started their activity aimed at DOIL development, stimulated by success in the development of a chemical oxygen–iodine laser (COIL). A detailed analysis of theoretical and experimental research on SDO production in electric discharge from the mid-1980s to the present, when the first DOIL has been launched, is given. Different kinetic models of oxygen low-temperature plasma are compared with the model developed by the authors. The latter comprises electron kinetics based on the accompanying solution of the electron Boltzmann equation, plasma chemistry including reactions of excited molecules and numerous ion–molecular reactions, thermal energy balance and electric circuit equation. The experimental part of the overview is focused on the experimental methods of SDO detection including experiments on the measurements of the Einstein coefficient for SDO transition and experimental procedures of SDO production in self-sustained and non-self-sustained discharges and analysis of different plasma-chemical processes occurring in oxygen low-temperature plasma which brings limitation to the maximum SDO yield and to the lifetime of the SDO in an electric discharge and its afterglow. Quite recently obtained results on gain and output characteristics of DOIL and some projects aimed at the development of high-power DOIL are discussed.

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Section: Selection Of Cross Sectionssupporting

confidence: 81%

Section: Experimental Methods Of Sdo Production In An Electric Dischargementioning

confidence: 99%

Physics and engineering of singlet delta oxygen production in low-temperature plasma

Ионин

Кочетов

Napartovich

et al. 2007

J. Phys. D: Appl. Phys.

265

190

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“…Figure 4 compares the theoretical and the present experimental values of the ratio of longitudinal diffusion coefficient to mobility (&/p),+ The present values agree Well with the theoretical values at low E / N , while for higher E / N , the theoretical values fall Figure 3. Drift velocity in oxygen: 0, Nielsen and Bradbury (1937); D, Herreng (1952); V , Doehring (1952); X , Frommhold (1964); 0, Schlumbohm (1965); 0, Naidu and Prasad (1970); A, Fleming eta1 (1972); 0 , present results. below the experimental values which seem to agree with the case A condition.…”

Section: Simulation Results In Oxygenmentioning

confidence: 47%

Electron swarm parameters in oxygen and methane

Al-Amin

Kucukarpaci

Lucas

1985

J. Phys. D: Appl. Phys.

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Experimental measurements of the drift velocity and the ratio of longitudinal diffusion coefficient to mobility for electrons have been obtained for the range of 25<or=E/N<or=848 Td for oxygen and 0.28<or=E/N<or=848 Td for methane (1 Td=10-17 V cm2). The results obtained from a Monte Carlo simulation have been compared with the present and previously obtained data and a good fit has been achieved for the entire range of E/N. As a result of this investigation, two sets of cross sections are given which accurately simulate electron swarm parameters in oxygen and methane. The simulation also produced results for the ionisation coefficient and the ratio of radial diffusion coefficient to mobility and these values have also been compared with other theoretical and experimental values, where available. The mean energy has also been computed.

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“…(a) Reduced mobility. The points are measurements from the following authors: Brose [71] (□); Crompton and Elford [72] (◯); Doehring [73] (△); Fleming et al [74] (▽); Herreng [75] (⋄); Jeon and Nakamura [76] ( ◃); Nelson and Davis [77] (▹); Nielsen and Bradbury [78] (⎔); Pack as given in [12] (☆); Reid et al [79] (⬠); Roznerski and Leja [80] (+). (b) Characteristic energy.…”

Section: Resultsmentioning

confidence: 99%

The role of rotational mechanisms in electron swarm parameters at low reduced electric field in N₂, O₂and H₂

Ridenti

Alves

Guerra

et al. 2015

Plasma Sources Sci. Technol.

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The homogeneous Boltzmann equation for electrons in N 2 , O 2 and H 2 is solved under the classical two-term approximation, for reduced electric fields in the interval 10 − 4 −10 Td where the electron-neutral encounters are limited to elastic, rotational and vibrational collisions. Rotational excitations/de-excitations are described using the following three different approaches: the discrete inelastic/superelastic collisional operator, written for a number of rotational levels that depends on the molecular gas and the specific rotational cross sections considered; the continuous approximation for rotations; a modified version of the continuous approximation for rotations, including a Chapman-Cowling corrective term proportional to the gas temperature. The expression of the rotational collision operator for this latter approach is deduced here and the results show that it bridges the gap between the discrete and the continuous descriptions at low/intermediate reduced electric fields. The calculations are compared with the measurements for the available swarm parameters to assess the validity of the different approaches and cross sections adopted to describe the rotational mechanisms.

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Messung der Anlagerungswahrscheinlichkeit von Elektronen an Sauerstoff mittels einer Laufzeitmethode

Cited by 48 publications

References 0 publications

Physics and engineering of singlet delta oxygen production in low-temperature plasma

Physics and engineering of singlet delta oxygen production in low-temperature plasma

Electron swarm parameters in oxygen and methane

The role of rotational mechanisms in electron swarm parameters at low reduced electric field in N₂, O₂and H₂

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Messung der Anlagerungswahrscheinlichkeit von Elektronen an Sauerstoff mittels einer Laufzeitmethode

Cited by 48 publications

References 0 publications

Physics and engineering of singlet delta oxygen production in low-temperature plasma

Physics and engineering of singlet delta oxygen production in low-temperature plasma

Electron swarm parameters in oxygen and methane

The role of rotational mechanisms in electron swarm parameters at low reduced electric field in N2, O2and H2

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The role of rotational mechanisms in electron swarm parameters at low reduced electric field in N₂, O₂and H₂