Electron Energy Distributions in Plasmas. V. A Search for Evidence of a High Anomalous Rate of Energy Exchange between the Electrons of a Low-Pressure Discharge

Details Electron Energy Distributions in Plasmas. V. A Search for Evidence of a High Anomalous Rate of Energy Exchange between the Electrons of a Low-Pressure Discharge Electron Energy Distributions in Plasmas. V. A Search for Evidence of a High Anomalous Rate of Energy Exchange between the Electrons of a Low-Pressure Discharge

Oct 1963

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1963rspsa.275..338t&link_type=abstract

Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, Volume 275, Issue 1362, pp. 338-356

Physics

3

Scientific paper

Since earlier measurements of electron energy distributions obtained with the Druyvesteyn probe method showed no evidence of the scattering observed in mercury by Langmuir (1925) and Merrill & Webb (1939), the method has now been used to examine discharges in hydrogen, neon, krypton and mercury in a search for evidence of such a high rate of energy exchange between the electrons. This was, in fact, observed in neon when, as the discharge current was increased, the well-defined group of primary electrons from the filament disappeared, giving rise to a uniform distribution. In krypton and mercury, the distribution near the filament was usually uniform, although frequently there was evidence of a strongly broadened primary group and electrons were often observed with energies greater than the potential difference between the filament and the measuring probe. This behaviour is almost certainly to be explained in terms of Langmuir scattering near the filament, but the scattering was always restricted to regions very close to the filament and was never observed in the positive column. Indeed, after the initial scattering the distribution is influenced by the applied field in a similar manner to that observed in earlier measurements and thus, in these gases, although the distribution is quite uniform near the filament there are very marked departures from uniformity further from the cathode as the distribution is accelerated in either a uniform field or through a step of potential, giving rise to well defined primary and secondary groups of electrons. These newly created primaries are not scattered. Measurements in high-field regions in krypton show a high ratio of primary to secondary electrons. This is due to the pronounced Ramsauer effect in this gas and was observed earlier in argon. The change of energy distribution resulting from the contamination of a discharge in neon by argon and mercury has been investigated.

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