Mobilities of thermal electrons in π-electron containing organic gases

Christophorou, Loucas G.; Blaunstein, R.P.; Pittman, D.

doi:10.1016/0009-2614(73)80530-5

Cited by 17 publications

(4 citation statements)

References 3 publications

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“…There is experimental evidence that other species, related to benzene, may also show virtual state scattering at very low electron impact energy. In figure 5 we show data for naphthalene (C 10 H 8 : two benzene rings), illustrating a rapid rise in both integral and backward scattering cross sections with decreasing electron impact energy, in accord with the anomalously low mobility of thermal electrons measured in anthracene (Christophorou et al 1973). Anthracene (three benzene rings) and perylene (five benzene rings) show similar behaviour in data restricted only to backward scattering (Field et al 1999).…”

Section: Concluding Remarks: Astrophysical Implicationssupporting

confidence: 64%

“…Open circles and squares, joined by dotted lines are theoretical values, respectively, of total integral and total backward cross sections from the full scattering calculations described in section 3. Christophorou et al (1973) showed that the mobility of electrons in benzene is anomalously low at thermal energies and suggested a momentum transfer cross section in excess of 100 Å 2 at low energies, in accord with results in Gulley et al (1998). For reference, data from Gulley et al (1998) for C 6 D 6 are reproduced in figure 1.…”

Section: Introductionsupporting

confidence: 57%

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Very low-energy electron scattering from benzene: experiment and theory

Field¹,

Ziesel²,

Lunt³

et al. 2001

J. Phys. B: At. Mol. Opt. Phys.

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Low-energy collision studies have shown that the scattering cross section for electrons by benzene rises sharply at electron impact energies below ∼ 200 meV. This was attributed in earlier work to electron attachment and formation of benzene anions with lifetimes τ 1 µs. A detailed study of electron attachment to benzene is reported here that makes use of Rydberg atom techniques. The data provide no evidence for the formation of long-lived benzene anions, although a small collisional ionization signal is observed which is consistent with the formation of short-lived excited anions (τ 3 ps). An alternative explanation for the rapid rise in cross section at low energy is presented, based on ab initio scattering calculations. These calculations indicate that virtual state scattering takes place at low energies. Possible implications of this are briefly discussed.

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Section: Concluding Remarks: Astrophysical Implicationssupporting

confidence: 64%

Section: Introductionsupporting

confidence: 57%

Very low-energy electron scattering from benzene: experiment and theory

Field¹,

Ziesel²,

Lunt³

et al. 2001

J. Phys. B: At. Mol. Opt. Phys.

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“…There has been a long history of electron interaction investigation on these molecules based on various experimental techniques. For low-energy electron scattering, transmission experiments range from investigations of the lowest negative ion resonances for fluorobenzenes [3][4][5], the compound negative-ion resonances and threshold electron-excitation states for monosubstituted benzene derivatives [6,7] and mobilities of thermal electrons in some of these π -electron containing benzene derivatives [8]. Investigations of the correlations between the ionization potentials and basicities in aromatic carbonyl compounds [9] and the effect, on electron affinities, of substituting atoms/radicals into these molecules [10], have also been carried out.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of electron and positron interactions with monosubstituted and disubstituted benzene derivatives: fluorobenzene, 1, 3-difluorobenzene and 1, 4-difluorobenzene molecules

Makochekanwa

Sueoka

Kimura

2004

J. Phys. B: At. Mol. Opt. Phys.

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Electron and positron scattering from fluorobenzene (C 6 H 5 F), 1, 3difluorobenzene (1, 3-C 6 H 4 F 2 ) and 1, 4-difluorobenzene (1, 4-C 6 H 4 F 2 ) molecules have been investigated experimentally using the linear transmission time-of-flight method. Total cross sections (TCSs) were measured and determined for 0.8-600 eV and 0.7-600 eV, respectively, for electron and positron scattering from 1, 3-C 6 H 4 F 2 and 1, 4-C 6 H 4 F 2 molecules, and 0.4-1000 eV and 0.2-1000 eV, respectively, for electron and positron scattering from C 6 H 5 F molecules. A broad resonance structure has been observed in the C 6 H 5 F electron TCSs at 0.8-1.6 eV, corresponding to the 1.6 eV 2 E 2u C 6 H 6 resonance structure. This broad structure seems to be made of two structures at 0.8 eV and 1.4 eV, which should mean that the original single 1.6 eV resonance peak in the C 6 H 6 parent molecule has split into two upon the monosubstitution of its H atom by the F atom. 1, 3-C 6 H 4 F 2 electron TCSs show a rising trend below 2 eV, a feature attributed to the polar nature of these molecules. Above 4 eV for all these three molecules, electron TCSs are greater than positron TCSs by a factor of ∼2 at energies up to 40 eV.

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“…Also, it is assumed that hot electrons have a constant drift velocity, W, which is close to its gas-kinetic value, W=2 ⋅10 4 m/s [11] at the field strength E ~ 10 8 V/m. In this case the space-charge limited current density is a linear function of the field magnitude:…”

Section: Formation Of Gas Bubbles a J Oule Heating Of Liquidsmentioning

confidence: 99%

Cavity initiation through an evaporating mechanism for the pulse breakdown in liquid

Atrazhev

Воробьев

Timoshkin

et al. 2009

2009 IEEE Pulsed Power Conference

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This paper presents an analytical model which describes the dielectric strength of insulating liquids stressed with the impulse electric fields. The Joule heating by the space charge saturated current may cause over-heating of pure liquids or may result in generation of nucleation centers associated with impurities in the case of practical liquids. Evaporation of the liquid from these impurities has been analysed in the paper and formation criterion for percolation chains of gas bubbles in impure dielectric liquids has been established. Based on this percolation condition, the dielectric behavior of n-hexane has been studied. Breakdown volt-time characteristics of liquid nhexane have been calculated for different temperatures, and its dielectric strength has been obtained as a function of externally applied pressure.

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Mobilities of thermal electrons in π-electron containing organic gases

Cited by 17 publications

References 3 publications

Very low-energy electron scattering from benzene: experiment and theory

Very low-energy electron scattering from benzene: experiment and theory

Experimental investigation of electron and positron interactions with monosubstituted and disubstituted benzene derivatives: fluorobenzene, 1, 3-difluorobenzene and 1, 4-difluorobenzene molecules

Cavity initiation through an evaporating mechanism for the pulse breakdown in liquid

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