Bringa E M, Johnson R E
Engineering Physics, University of Virginia, Charlottesville, Virginia 22903, USA.
Phys Rev Lett. 2002 Apr 22;88(16):165501. doi: 10.1103/PhysRevLett.88.165501. Epub 2002 Apr 4.
A fast ion can electronically excite a solid producing a track of damage, a process initially used to detect energetic particles but now used to alter materials. From the seminal paper by Fleischer et al. [Phys. Rev. 156, 353 (1967)] to the present, "Coulomb explosion" and thermal spike models have been often treated as competing models for describing ion track effects. Here molecular dynamics simulations of electronic sputtering, a surface manifestation of track formation, show that in the absence of significant quenching Coulomb explosion in fact produces a spike at high excitation density, but the standard spike models are incorrect.
快速离子能够使固体发生电子激发，产生损伤径迹，这一过程最初用于探测高能粒子，但现在用于改变材料。从弗莱舍等人的开创性论文[《物理评论》156, 353 (1967)]发表至今，“库仑爆炸”模型和热尖峰模型常常被视为描述离子径迹效应的相互竞争的模型。本文通过对电子溅射（径迹形成的一种表面表现）进行分子动力学模拟表明，在不存在显著猝灭的情况下，库仑爆炸实际上在高激发密度下会产生一个尖峰，但标准的尖峰模型是不正确的。
