Physics
Scientific paper
Oct 1971
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971natur.233..472s&link_type=abstract
Nature, Volume 233, Issue 5320, pp. 472-473 (1971).
Physics
5
Scientific paper
RECENTLY1 a double mercury discharge vessel was used (Fig. 1), in which a large current running in the outer vessel irradiated the small current discharge in the inner vessel with 2537 Å resonance radiation. This irradiation caused the running voltage and electron temperature in the inner discharge to be reduced appreciably over the non-irradiated mode of operation. The explanation offered was that the neutral Hg atoms in the inner vessel absorbed the resonance radiation and entered the 63P1 state (see Fig. 2), and from this level the atom was ionized by electron impact. In addition the 63P0 and 63P2 metastable levels are populated from the 63P1 level by electron collisions and by cumulative absorption and radiative decay of higher levels. Because the radiation field is doing approximately half the ionization work, the electron temperature drops correspondingly.
Allen Edward J.
Stangeby P. C.
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