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Displacement spike
Instructions: Click "Start" to cause an neutron (not shown)
to displace a primary knock-on atom. This atom will then displace others,
to create a depleted zone of vacancies with interstitial atoms surrounding
it. The key provides an easy way to see what caused the displacement of
the atom, whether it's the initial neutron (bright red), the first displaced
atom (slightly darker red), etc. Select the "draw lines" option to more
easily visualise the lattice structure.