Spatial Distribution of Biomolecules Sputtered Under Fast Heavy Ion Bombardment
At present the sputtering of biomolecules under fast heavy ion bombardment has been investigated comprehensively (see, for example, Ref.  and the references therein). The dependence of biomolecular ion yield on the velocity, on charge state and angle of incidence of the bombarding ion, and on the energy loss and film thickness, have been studied. However, the results have varying importance for understanding the mechanism of biomolecule sputtering. For example, satisfactory agreement with measured ion yield dependence on energy loss has been obtained in theories based on rather different mechanisms: molecular desorption has been attributed to bond-breaking by electrons emerging from fast ion track , to shock waves  and to the formation of a thermal spike [4,5]. It seems that the ion yield dependence on dE/dx is only weakly sensitive to the biomolecule sputtering mechanism. It may be significant that, as presented, the models in Refs. [2–5], do not describe the yield of neutrals as a function dE/dx .
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