Sputtering of dielectric materials by nucleus fission fragments

A new theory of sputtering of dielectric materials by nucleus fission fragments is developed. The region of high-excitation electrons with temperature ∼ 15-25 eV, 2-4 medium ionic charge and ∼ 10 A initial radius is formed near the trajectory of fragment motion. Occurrence of the ionization wave causes the expansion of this region and cooling of the electron gas. Surface atoms of the hot region are turned out to be weakly bound with the lattice and at cooling they accumulate energy in the electric field of the double layer exceeding substantially their binding energy. The sputtering coefficient is ∼ 102-103 atom/fragm