A fully dynamical computer model of a bcc crystal is used to compute the displacement energy (ED ) spectrum of primary knock-on (PKO) atoms in Tungsten. ED is found to be quite directionally dependent and, when the crystal is assigned a nonzero temperature, to have a spread in energy greater than that predicted by a simple two-body argument. Furthermore, when an energy of 5 to 10 eV greater than ED is given to the PKO in the (100) direction, there is a significant chance that an uncorrelated Frenkel pair will be produced.
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Stuart et al. (1976) studied this question.
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