A New Method for Measuring the Attachment of Slow Electrons in Gases

Huxley, L.G.H.; Crompton, R. W.; Bagot, C.H.

doi:10.1071/ph590303

Cited by 40 publications

(9 citation statements)

References 3 publications

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“…The calculated Townsend reduced, attachment coefficient, η/N (also known as attachment, reduced coefficient), for the pure oxygen molecule as a function of E/N is shown in figure (9). The present calculation i found tso be in a good agreement with theoretical results of (Jeon, 2003;Hien et al, 2012 andAlves et al, 2016) and experimental results of (Huxley et al, 1959). An electron avalanche can occur when the effective ionization-coefficient (α-η)/N >0.…”

Section: Resultssupporting

confidence: 89%

Boltzmann equation studies on electron swarm parameters for oxygen plasma by using electron collision cross – sections

2020

ZJPAS

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The Boltzmann transport equation has been solved using a two-term approximation method in pure electronegative gas oxygen to evaluate the electron energy distribution function (EEDF) and electron transport parameters for a wide range of E/N varying from 0.1 to 1000 Td (1 Td=10-17 V.cm 2). These parameters, are "electron drift velocity, mean electron energy, characteristic energy, diffusion coefficients, electron mobility, attachment and ionization coefficients, effective ionization coefficient and critical reduced electric field strength (E/N) crt ".. The dependence of second kind collision (super-elastic collision) and electron energy distribution function on E/N are explained (where E is electric field and N is neutral number density). The present calculated results are in good agreements as compared, with the previous experimental and theoretical results. A group of electron/molecule collision (elastic and inelastic) cross-sections are collected for oxygen gas to evaluate transport parameters over the entire E/N range. In addition, the energy lost by different types of electron/molecule collision processes are computed as a function of E/N.

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Section: Resultssupporting

confidence: 89%

Boltzmann equation studies on electron swarm parameters for oxygen plasma by using electron collision cross – sections

2020

ZJPAS

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“…The method adopted in the present investigation for the determination of kl and aa/P was that proposed by Huxley (1959) (see also Hurst and Huxley 1960) and applied hitherto to measurements in oxygen (Huxley, Crompton, and Bagot 1959;Rees 1965). The apparatus used for the investigation has been fully described by Crompton and J ory (1962) and is shown schematically in Figure 1.…”

Section: Experimental Methodsmentioning

confidence: 99%

The Diffusion and Attachment of Electrons in Water Vapour

Crompton¹,

Rees²,

Jory³

1965

Aust. J. Phys.

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SummaryThe energy ratio and attachment coefficient for electrons in water vapour have been determined in the range 20 < Elp < 60 V cm-l torr-l. The results for the attachment coefficient are in general agreement with other recent determina· tions, but those for the energy ratio differ significantly from the results of Bailey and Duncanson. The use of these new data, in conjunction with values of the drift velocity determined by Pack, Voshall, and Phelps, is shown to remove the serious discrepancy which previously existed between the results of single-collision and swarm experiments. r. INTRODUCTIONWhen electrons having energies of the order of 5 e V pass through water vapour at a pressure of a few torr, an appreciable fraction of the electrons form negative ions by electron attachment. According to Laidler (1954), Craggs and McDowell (1955), and others, the dominant attachment process for energies up to about lO e V is the following resonance capture process:(1)Laidler states that the water molecule is first raised to a repulsive 2Al or 2A2 state of H 2 0-which at once dissociates into H -(IS) and OH(27T). The appearance potential is of the order of 5·5 e V, and the cross section is a maximum for electrons having energies of about 6·5 eV.The curve showing the variation with electron energy of the rate of production of H -ions from H 2 0 shows a second, smaller peak which has a maximum value at an energy of about 8·5 eV (Mann, Hustrulid, and Tate 1940; Buchel'nikova 1959). For electrons of energy greater than about 7·5 eV, 0-ions may also be produced, the reaction being (2) It is widely believed (see, for example, Cottin 1959) that the H-ions formed as above are rapidly converted to negative hydroxyl ions by the following process:At gas pressures of the order of 1 torr, Branscomb and Smith (1955) and Muschlitz and Bailey (1956) observed that the OH-ions so formed were considerably more abundant than either H -or 0-ions.

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“…(1962) in what follows), and Eiber (1963aEiber ( , 1963b. In a third group of experiments measurements of the Townsend energy factor kl for electrons in oxygen have been made by Townsend and Bailey (1921), Brose (1925), Healey and Kirkpatrick (1939), and Huxley, Crompton, and Bagot (1959) (the latter paper will be referred to as H.C.B. ).…”

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confidence: 99%

The Behaviour of Free and Attached Electrons in Oxygen

Rees¹

1965

Aust. J. Phys.

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SummaryThe behaviour in oxygen of swarms of electrons having mean energies of up to 2 eV has been studied. Confirmation of the occurrence in oxygen of a three-body attachment process has been obtained, and the attachment coefficient has been measured for 0·4 < E/p < 6 Vcm-1 torr-1. Values of the Townsend energy fa()tor k1 have also been obtained over the same range of values of E/p. It was observed that at least three species of negative ions were formed either directly by the electron attachment processes or through secondary collisions between these primary ions and the gas molecules. The mobilities of the various ion species were determined over the range 0

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A New Method for Measuring the Attachment of Slow Electrons in Gases

Cited by 40 publications

References 3 publications

Boltzmann equation studies on electron swarm parameters for oxygen plasma by using electron collision cross – sections

Boltzmann equation studies on electron swarm parameters for oxygen plasma by using electron collision cross – sections

The Diffusion and Attachment of Electrons in Water Vapour

The Behaviour of Free and Attached Electrons in Oxygen

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