Formation of He bubbles in Al films irradiated with He ions

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Abstract
The trapping of He in bubbles produced by implantation of Al films and the dependence of the pressure-shifted He 11S0-21P1 transition on the He concentration CHe have been studied by electron energy-loss spectroscopy, transmission electron microscopy, and proton-enhanced scattering. Application of an equation of state for super-dense He allows the evaluation of the dependence of the bubble concentration CB on CHe. The authors find that bubble nucleation takes place predominantly for CHeB decreases rapidly with increasing CHe indicating the onset of bubble migration and coalescence.