Abstract
Absolute concentrations of ground state atomic hydrogen are determined by two-photon absorption laser-induced fluorescence in a pure hydrogen rf discharge. Axial concentration profiles obtained across the interelectrode space show a relatively constant concentration (of the order of 1014 atoms/cm3) in the region around the center of the discharge until it decreases sharply within 3–4 mm of each metal electrode surface. In addition, the temporal evolution of the atomic concentration is monitored by means of a pulsed discharge from short times to the establishment of a steady-state concentration. We present a model according to which the formation and decay of the distribution of atomic hydrogen is dominated by diffusion from the production regions towards both the center of the discharge and the metallic electrode surfaces where H atoms are absorbed.
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