Abstract
Recent experimental data on latent tracks induced in ${\mathrm{CaF}}_{2}$ by cluster ions are analyzed applying a thermal spike model. The track evolution can be described by the same equations in radiolysis sensitive ${\mathrm{CaF}}_{2}$ and in the radiolysis resistant ${\mathrm{Y}}_{3}{\mathrm{Fe}}_{5}{\mathrm{O}}_{12},$ using similar parameter values. The efficiency of the localized energy deposition $g=0.18$ for ${\mathrm{CaF}}_{2},$ which is equal within experimental error to that in ${\mathrm{Y}}_{3}{\mathrm{Fe}}_{5}{\mathrm{O}}_{12}$ at high ion velocities. This indicates that the damage cross section is not sensitive to the ion velocity in ${\mathrm{CaF}}_{2}.$ The similarities observed in the track evolution in insulating crystals, polymers, semiconductors, and high-${T}_{c}$ superconductors are explained by the Gaussian spatial distribution of the excitation energy with close values of the distribution parameters.
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