Abstract
Most of spherical blisters formed by deuterium (D) bombardment (38 eV/D) up to 3 × 10 24 D/m 2 at 300 K on polycrystalline tungsten are fully elastic deformations. This has been proven by opening individual blisters with a focused ion beam and in situ observation of their complete relaxation by scanning electron microscopy. The D 2 gas filling is confirmed by observing simultaneously the D 2 puff. The gas pressure is causal for the stability of such spherical blisters after implantation and the gas release leads to sudden relaxation. The dilatation of the blister cap by trapped D can be excluded as cause for the blisters.
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