Synergy of nuclear and electronic energy losses in ion-irradiation processes: The case of vitreous silicon dioxide
Synergy of nuclear and electronic energy losses in ion-irradiation processes: The case of vitreous silicon dioxide
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DOI：
10.1103/physrevb.83.054106
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发表时间：
2011-02-16
影响因子：
3.7
通讯作者：
Zhang, Yanwen
中科院分区：
文献类型：
--
作者：
Toulemonde, Marcel;Weber, William J.;Zhang, Yanwen
研究了Au离子辐照对玻璃态SiO2的结构改性，在能量范围（0.3-15 MeV）内，随着能量的增加，核能损失的减少被电子能量损失的增加所补偿，导致接近恒定的总能量损失，近似为4 keV/nm。从红外波段的变化作为离子注量的函数推导出的离子冲击造成的损坏区域的半径，从4.9 nm在0.3 MeV的2.5和2.6 nm在9.8和14.8 MeV，分别减少。基于先前的数据，其中玻璃质SiO2用高得多的能量Au离子照射，损伤区半径从22.7 MeV的2.4 nm增加到168 MeV的5.4 nm，并且在0.3至168 MeV的能量区域中观察到对能量的U形依赖性。目前的结果表明，在低和高离子能量的大的损伤半径可以解释的弹性或非弹性热尖峰模型，分别。在原子核和电子的能量损失都很大的过渡区，我们提出了一个由弹性碰撞尖峰模型和非弹性热尖峰模型组成的统一的热尖峰模型来解释和描述从原子核到电子能量区的半径演化.
Structural modification of vitreous SiO2 by Au ion irradiation is investigated over an energy regime (similar to 0.3-15 MeV) in which the decrease of the nuclear energy loss with increasing energy is compensated by the increase of the electronic energy loss, leading to a nearly constant total energy loss of similar to 4 keV/nm. The radii of damaged zones resulting from the ion impact, deduced from changes in infrared bands as a function of ion fluence, decrease from 4.9 nm at 0.3 MeV to 2.5 and 2.6 nm at 9.8 and 14.8 MeV, respectively. Based on previous data where vitreous SiO2 was irradiated with much higher energy Au ions, the damage zone radius increases from 2.4 nm at 22.7 MeV to 5.4 nm at 168 MeV, and a U-shaped dependence on energy is observed is observed in the energy region from 0.3 to 168 MeV. The current results demonstrate that large damage radii at low and high ion energy can be explained by the elastic or inelastic thermal spike model, respectively. In the transition regime where both nuclear and electronic energy loss are significant, a unified thermal spike model consisting of a coherent synergy of the elastic collision spike model with the inelastic thermal spike model is suggested to interpret and describe the radius evolution from the nuclear to the electronic energy regime.