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• W2079389964 abstract "The density and pressure of He in small bubbles (diameter d ≳ 1 nm) were investigated by electron energy loss spectroscopy (EELS) and transmission electron microscopy (TEM). Thin films (50–100 nm) of Al and Ni were homogeneously implanted with He+ ions at various energies (0.5–8 keV) and doses ( ≲ 1022 m−2) at room temperature. In Al EELS revealed plasmon losses at the bubble surface as well as shifted and broadened He 11S0–21P1 transitions. The dependence of the energy shift of the He line upon implantation dose and annealing temperature is analysed. Using an equation of state for extremely dense He the relationship ΔE = (24±5) × 10−3neVnm3 (n = Hedensity) was deduced from our TEM and EELS data. This analysis is consistent only under the assumption that at room temperature the pressure is controlled by loop punching. Ab-initio bandstructure calculations for the density dependence of the energy shift ΔE for periodically excited solid fcc He show good agreement with the relationship deduced from experiment. In Al the largest value ΔE = 3.3 eV results in a maximum He density of (0.14 ± 0.02) × 103nm−3, corresponding to a pressure of about 130 kbar. In Ni energy shifts up to ΔE = 4.7 eV were observed, resulting in a maximum He density of 0.20 × 103 nm−3 in bubbles, which is 10 times as high as the density of liquid He at 4.2 K and 1 bar. This corresponds to a pressure of about 500 kbar which is of the order of magnitude of the threshold pressure for Ni self-interstitial atom emission." @default.
• W2079389964 created "2016-06-24" @default.
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• W2079389964 date "1982-11-01" @default.
• W2079389964 modified "2023-09-24" @default.
• W2079389964 title "Density and pressure of helium in small bubbles in metals" @default.
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• W2079389964 doi "https://doi.org/10.1016/0022-3115(82)90288-4" @default.
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