Electron attachment to sulphur dioxide in high pressure gases

Rademacher, Johanna; Christophorou, L. G.; Blaunstein, R.P.

doi:10.1039/f29757101212

Cited by 41 publications

(18 citation statements)

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“…This pressure dependence has been observed as well in 1-C 3 F 6 [6] and other fluorocarbon gases [12,13] and is typically due to the occurrence of three-body electron attachment [14]. In this section, we consider the simple model for three-body attachment described in [16] and apply it to the present measurements.…”

Section: Three-body Electron Attachment To Hfo1234zementioning

confidence: 97%

“…The initial distribution of the released electrons is assumed to be a Dirac delta. In case of strong electron detachment, cathodic feedback or photo-ionization by secondary photons, equation (12) cannot be used to derive precise values of v e and τ D from our measured currents. However, it can be still applied to derive ν eff , as will be described in section 3.6.…”

Section: Model Of Electron Swarmsmentioning

confidence: 99%

“…For typical gap distances and pressures in our experiments T e is two orders of magnitude larger than τ D , that is T e /τ D ≈ 10 2 . In this case, the electron current at time T 3 drops to I e (T 3 )/I 0 ∝ (1 − erf 0.5 T e /τ D ) ≈ 10 −12 of its initial current, according to equation (12). Thus, from this time point on, no more electrons are present and the measured current is only from ions I exp (T 3 ) = I ion (T 3 ).…”

Section: Model Of Ion Swarmsmentioning

confidence: 99%

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Electron swarm parameters of the hydrofluoroolefine HFO1234ze

Chachereau

Rabie

Franck

2016

Plasma Sources Sci. Technol.

127

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Abstract. In this contribution, the electron swarm parameters of the hydrofluoroolefine HFO1234ze, systematic name 1,3,3,3-Tetrafluoro-1-propene, are experimentally investigated. The analysis of the electron avalanche current measured in a pulsed Townsend experiment yields the effective ionization rate coefficient, the electron drift velocity and the longitudinal electron diffusion coefficient. The subsequent ion current is analyzed as well, to obtain separately the ionization and attachment rate coefficients. Measurements in pure HFO1234ze at different pressures show that the effective ionization rate is strongly influenced by three-body attachment and the three-body attachment rate coefficient is derived.

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Section: Three-body Electron Attachment To Hfo1234zementioning

confidence: 97%

Section: Model Of Electron Swarmsmentioning

confidence: 99%

Section: Model Of Ion Swarmsmentioning

confidence: 99%

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Electron swarm parameters of the hydrofluoroolefine HFO1234ze

Chachereau

Rabie

Franck

2016

Plasma Sources Sci. Technol.

127

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“…Of Although reaction (20) has been found to describe reasonably well the [M] dependence of R for some systems (e.g., the formation of°2-in C2H4) over the entire density range from a few torr to the liquid density (106) in many other cases (77,(106)(107)(108)(109) The effect of the density of a gaseous medium on the rate of attachment of electrons to molecules embedded in it can be seen from the examples in Figures 19 and 20 for, respectively, 02…”

Section: Short-lived Transient Negative Ionsmentioning

confidence: 99%

Negative ions of polyatomic molecules.

Christophorou¹

1980

Environ Health Perspect

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In this paper general concepts relating to, and recent advances in, the study of negative ions of polyatomic molecules are discussed with emphasis on halocarbons. The topics dealt with in the paper are as follows: basic electron attachment processes, modes of electron capture by molecules, short-lived transient negative ions, dissociative electron attachment to ground-state molecules and to "hot" molecules (effects of temperature on electron attachment), parent negative ions, effect of density, nature, and state of the medium on electron attachment, electron attachment to electronically excited molecules, the binding of attached electrons to molecules ("electron afflinity"), and the basic and the applied significance of negative-ion studies. Basic -Electron Attachment ProcessesThis paper deals with negative ions formed in electron-molecule collisions at low energies (<15 eV). Negative ions produced at higher energies (e.g., ion-pair processes) or in collisions of molecules with electronically-excited species (e.g., metastable atoms, Rydberg states) will not be discussed. The basic processes to be considered, then, can be classified as electron attachment to ground state molecules, to "hot" molecules, or to electronically excited molecules.Electron attachment to ground state molecules predominantly in their lowest state(s) of internal excitation may be represented by the scheme of Eqs. (1)

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“…For molecules with positive affinities, the monomers can already trap electrons, giving birth to temporary negative ions with lifetimes ranging from a few vibrational periods (e.g. SO 2, 0 2 [4]) which are unobservable in single collision experiments, up to several milliseconds (e.g. S F 6 [5]).…”

Section: Introductionmentioning

confidence: 99%

Electron transfer collisions between sulfur dioxide clusters and laser-excited Rydberg atoms

Desfrançois

Khélifa

Lisfi

et al. 1991

Z Phys D - Atoms, Molecules and Clusters

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Electron attachment to SO 2 clusters is studied in a pulsed crossed beam apparatus,, using laser-excited nf Rydberg atoms as a low energy electron source. The results are interpreted as an attachment to a dimer subcluster followed by a rapid impulsive dissociation of the nascent dimer anion. The remaining cluster anions possess a large amount of internal energy. At low principal quantum numbers n, the influence of the Rydberg ionic core leads to an important evaporation process interpreted with simple model calculations. 34.50.g; 34.70.; 35.20.W; 36.40. PACS:

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Electron attachment to sulphur dioxide in high pressure gases

Cited by 41 publications

References 1 publication

Electron swarm parameters of the hydrofluoroolefine HFO1234ze

Electron swarm parameters of the hydrofluoroolefine HFO1234ze

Negative ions of polyatomic molecules.

Electron transfer collisions between sulfur dioxide clusters and laser-excited Rydberg atoms

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