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Abstract
Abstract A detailed study has been performed of the effect of the electric field (∼4.75 VA−1) required for field ionization of helium gas atoms, in the field ion microscope (FIM), on the isochronal recovery spectrum of ion (30 keV W+) irradiated tungsten. All the irradiations were performed in-situ under ultra-high vacuum conditions (<10−9 torr) to a constant dose of 5 · 1012 ion cm−2. The FIM specimens used were prepared from oriented single crystals of high purity tungsten with a resistivity ratio of 5 · 104. The experimental procedure involved a comparison of the isochronal recovery spectra in the range 18 to 120 K of specimens irradiated at 18 K in the absence of both the electric field and the imaging gas with identical specimens which were irradiated at 50 K and then cooled to 18 K in the absence of both the electric field and the imaging gas. The results of these recovery experiments demonstrated that the field of ∼4.75 VA−1 has only a minimal effect on the annealing kinetics of self-interstitial a...
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