Collisional and thermal effects on liquid lithium sputtering
Collisional and thermal effects on liquid lithium sputtering
复制标题
DOI：
10.1103/physrevb.76.205434
复制
发表时间：
2007-11
影响因子：
3.7
通讯作者：
J. Allain;M. Coventry;D. Ruzic
中科院分区：
文献类型：
--
作者：
J. Allain;M. Coventry;D. Ruzic
利用离子表面相互作用实验装置测量了低能量单荷电粒子轰击下液态锂和锡锂表面的锂溅射产量随目标温度的变化规律。考虑到锂在200到400℃之间的蒸发，总侵蚀超过了传统碰撞溅射的预期。用高通量D原子处理的锂表面在200到1000 eV之间和45°入射下被H{sup +}、D{sup +}、He{sup +}和Li{sup +}轰击。侵蚀测量说明了依赖温度的蒸发。例如，在室温下，700 eV He{sup +}粒子轰击d处理过的液态Li表面，导致溅射产率为0.12 Li/ion，在温度{约}2.0T{sub m}（其中T{sub m}是样品的熔化温度）时，产率接近或高于1。观察到锂溅射的增强是温度和粒子能量的强烈函数。用于比较的低蒸汽压锂合金（0.8 Sn-Li）轰击也会导致锂侵蚀作为温度函数的非线性上升。对纯液态锂和合金的测量表明，二次离子诱导的二次离子发射与表面温度有较弱的相关性。当在室温下测量时，用D处理液态锂表面，由于优先溅射效应，在He{sup +}的影响下，溅射率降低了5-6倍。«少
The lithium sputtering yield from lithium and tin-lithium surfaces in the liquid state under bombardment by low-energy, singly charged particles as a function of target temperature is measured by using the Ion-surface Interaction Experiment facility. Total erosion exceeds that expected from conventional collisional sputtering after accounting for lithium evaporation for temperatures between 200 and 400 deg. C. Lithium surfaces treated with high-fluence D atoms are bombarded by H{sup +}, D{sup +}, He{sup +}, and Li{sup +} at energies between 200 and 1000 eV and 45 deg. incidence. Erosion measurements account for temperature-dependent evaporation. For example, 700 eV He{sup +} particles bombarding the D-treated liquid Li surface at room temperature result in a sputter yield of 0.12 Li/ion and at temperatures {approx}2.0T{sub m} (where T{sub m} is the melting temperature of the sample), a yield near and above unity. The enhancement of lithium sputtering is observed to be a strong function of temperature and moderately on particle energy. Bombardment of a low-vapor-pressure lithium alloy (0.8 Sn-Li), used for comparison, also results in nonlinear rise of lithium erosion as a function of temperature. Measurements on both pure liquid Li and the alloy indicate a weak dependence with surface temperature of the secondarymore » ion-induced secondary ion emission. Treatment of liquid Li surfaces with D, yields reduced sputtering under He{sup +} impact by a factor of 5-6 when measured at room temperature due to preferential sputtering effects.« less