Dynamical behavior of helium bubbles in gold during irradiation with high-energy self-ions

The dynamical response of helium bubbles to irradiation with high-energy self-ions in pure gold has been studied by in situ electron microscopy. It is found that sporadic movement of small helium bubbles is induced in random directions within a few nm or less under the irradiation with 400 keV Au+ ions at room temperature, where bubbles are thermally immobile. Computer simulation indicates that these facts are consistent with the bubble movement interacting with the collision sub-cascades