Model-independent test of the truncated crater function theory of surface morphology evolution during ion bombardment
Model-independent test of the truncated crater function theory of surface morphology evolution during ion bombardment
复制标题
离子轰击过程中表面形貌演化截断坑函数理论的模型独立检验
DOI：
10.1103/physrevb.89.115433
复制
发表时间：
2014
影响因子：
3.7
通讯作者：
K. Ludwig
中科院分区：
文献类型：
--
作者：
J. Perkinson;Eitan Anzenberg;M. Aziz;K. Ludwig
一大类“局部响应”理论试图根据对单个撞击的平均表面高度响应来预测高能粒子辐照期间的形态演变--一种已由Norris等人[J. Phys.：康登斯Matter 21，224017（2009）; Nat. Commun. 2，276（2011）]。只保留与平坦表面的响应相关联的弹坑函数形式主义中的项，促进了使用单个离子撞击的分子动力学模拟来预测平坦表面对离子轰击的稳定性或不稳定性。在这里，我们报告了一个敏感的实验测试，这个截断火山口函数理论是独立的火山口函数本身的任何先验知识。现有的测量1千电子伏Ar+/Si和Kr+/Ge是不一致的截断陨石坑功能理论的预测，任何可能的陨石坑功能，在高轰击角。该理论的失败表明，从单离子碰撞模拟中预测表面演变将比以前假设的更具挑战性。
A broad class of “local response” theories seeks to predict morphology evolution during energetic particle irradiation in terms of average surface height response to individual impacts—an approach that has been generalized by the crater function formalism of Norris et al. [J. Phys.: Condens. Matter 21, 224017 (2009); Nat. Commun. 2, 276 (2011)]. Keeping only the terms in the crater function formalism associated with the response of a flat surface has facilitated the use of molecular dynamics simulations of individual ion impacts to predict the stability or instability of a flat surface to ion bombardment. Here we report a sensitive experimental test of this truncated crater function theory that is independent of any a priori knowledge of the crater function itself. Existing measurements for 1 keV Ar+/Si and Kr+/Ge are inconsistent with the predictions of truncated crater function theory, for any conceivable crater function, at high bombardment angles. The failure of the theory suggests that the prediction of surface evolution from simulations of single-ion impacts will be more challenging than had been assumed.