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Production of Photons in a Townsend Gap in Air, Nitrogen, and Argon LEON H. FISHER Department of Physics, University of California, Berkeley, California November 13, 1945 ECENTLY, Geballel reported measurements in a .I Townsend gap of the photon-ion ratio in hydrogen. This study has been extended, with the same equipment, to air, nitrogen, and argon. No photoelectric currents could be measured below breakdown in any of the three gases studied, regardless of values of pressure and voltage. The electrometer used was capable of detecting 10-1s ampere, In order to detect photoelectrons at the brass surface, photons of adequate energy must be produced in the gas, and these high energy photons must not be absorbed too strongly in the gas. High energy photons may be expected especially in gases having metastable states, and photon absorption will be high in mixed gases and in gases having metastable states. Streamers (which depend on photo- ionization in the gas) may be expected in mixed gases, and in gases containing metastables. Weissler2 has shown that no pre-onset streamers appear in the positive point-to-plane discharge in pure hydrogen and in pure nitrogen. In argon, the first streamer is so intense that the gap breaks
Physical Review – American Physical Society (APS)
Published: Dec 1, 1945
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