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• W2041738803 abstract "The influence of chemically active gases (O2 and H2O) on hydrogen re-emission was investigated by and permeation through a Nb membrane acted upon by 20 keV H2+ ions. Both the initial retention of ions after switching on the ion beam and the build-up of re-emission with time can be directly monitored with the new UHV apparatus by the changes of hydrogen pressure in the vacuum chamber in front of the membrane, since this pressure is determined by the incoming beam. In the absence of O2 or H2O, only a small portion of the flux absorbed penetrates the membrane, and the re-emission flux virtually equal to the flux of incident ions is established following the absorption of a relatively small dose. The admittance of O2 or H2O on the inlet side of the membrane continuously acted upon by the H2+-ion beam results in a dramatic increase of both the retention and the permeation of implanted hydrogen. With the pressures of O2 and H2O corresponding to about 0.03 O-atoms supplied to the sample surface per impinging proton, the time to reach the steady-state re-emission sharply rises, indicating a drastic increase of the dose absorbed. The steady-state re-emission flux is not changed appreciably, while the permeation flux, though increased by orders of magnitude, remains small compared to the incident ion flux. With greater pressures of the admitted gases (more than 0.1 O-atom supplied to the surface per proton), not only the sorptional capacity is increased, but also the permeation flux reaches up to the magnitude comprising the major part of the absorbed flux (i.e. superpermeability develops), and the re-emission flux correspondingly falls." @default.
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• W2041738803 date "1991-01-01" @default.
• W2041738803 modified "2023-09-28" @default.
• W2041738803 title "Large-scale effects of H2O and O2 on the absorption and permeation in Nb of energetic hydrogen particles" @default.
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• W2041738803 doi "https://doi.org/10.1016/0022-3115(91)90450-l" @default.
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