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- W2063764231 abstract "In this paper we describe experiments in which solid hydrogen is heated by laser-produced plasma. Motivation for this experiment is the possibility of producing large quantities of vibrationally excited hydrogen. (Vibrationally excited hydrogen is desirable for the production of H− ions by dissociative attachment.) A possible technique for formation of vibrationally excited hydrogen is heating it to 3000–5000 K in a dense enough state so that little dissociation takes place. The heated hydrogen is then allowed to expand and cool but because of a long relaxation time for deexcitation the vibrational excitation persists. A thin slab of solid hydrogen was mounted on a metal substrate, and laser light with power density 108–109 W/cm2 was used to heat the target. Because of the desired temperature the hydrogen could not be heated directly. (This would require much larger laser power which, in turn, would heat the hydrogen to much too high a temperature.) The laser light was absorbed by the metal substrate, and the resulting plasma transferred its energy to the solid hydrogen. Experimental results to determine resulting hydrogen temperatures are presented for different slab thicknesses. Diagnostics used included fast-framing and streak photography, Faraday cups, and a piezoelectric probe. A model is developed which allows the results to be explained. Hydrogen is ablated off the slab at the metal plasma surface, and the gas is heated by heat transfer. A shock wave is driven into the hydrogen. Then depending on the slab thickness one of two things occurs. For thin slabs we propose a Rayleigh-Taylor instability which causes the hydrogen to blow a hole in the solid (or liquid) and expand into vacuum. Under the right condition the expanded gas can then be used for H− production. If the slab is too thick, the shock wave becomes strong enough to produce vaporization. The resulting gas mixes with the heated gas, cooling it and preventing any large amount of vibrational excitation." @default.
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- W2063764231 date "1985-07-01" @default.
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- W2063764231 title "Indirect heating of solid hydrogen with a moderately powered laser" @default.
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- W2063764231 doi "https://doi.org/10.1063/1.335703" @default.
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