The swarm parameter has been calculated as a function of the amount of NF3 in Ar, He and N2 using the two-term Boltzmann equation. In particular, the attachment coefficient and attachment rate coefficient in NF3 are compared with the experimental values measured by Lakdawala et al. The large discrepancies between the measured and calculated values of the attachment rate coefficient for NF3 mixture in Ar, which were pointed out by Lakdawala et al., are discussed.
The authors describe observations on the negative pulseless corona in air between plane and needle electrodes and reports the characteristics of the transition from the negative pulseless corona to spark breakdown by measuring the luminosity and the space potential of the discharge gap. For the measurement of the space potential, a triode tube electrometer was used. The luminosity near the plane electrode is strongest just before the spark breakdown, and the transition from negative pulseless corona to spark breakdown starts from the plane electrode. At the spark breakdown, the field intensity in this region is constant for gap length ranging from 8 to 16 mm. This field intensity is about 43 V cm-1 Torr-1. It is the condition of the transition from negative pulseless corona to spark breakdown that the relation alpha >or= eta is accomplished near the plane electrode.
For times greater than the electron transit time, a suitable statistical theory of the total number of electrons in avalanches is presented, and compared with the results simulated by the Monte Carlo method.
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