Infrared-induced single-phonon desorption of H2, HD, and D2 from graphite single crystals

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Abstract
H2, HD, and D2 gases are physisorbed on graphite single crystals at T≤12 K. The relation between the monolayer density [ρ=1 for the ((3)1/2×(3)1/2) R30 ° phase] and the gas flux impinging on the graphite was investigated as a function of temperature using low-energy electron diffraction. At ρ≤1.30, the gas flux required to produce a given incommensurate H2 monolayer density is found to be the same at T=5 and 10 K. This effect is interpreted by single-phonon desorption induced by the room-temperature infrared radiation. Desorption measurements indicate that for the H2 monolayer in our geometry this single-phonon desorption occurs at a rate of ∼0.02 monolayer per second.

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