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首页> 外文期刊>The European physical journal, D. Atomic, molecular, and optical physics >Polarization wake of penetrating ions: Oscillator model
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Polarization wake of penetrating ions: Oscillator model

机译：渗透离子的极化唤醒：振荡器模型

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摘要

The wake potential induced by a swift nonrelativistic ion has been studied theoretically for a random stopping medium consisting of quantal-harmonic-oscillator atoms. The primary purpose has been to study the influence of atomic binding on the frequently-studied wake potential in a Fermi gas. Quantitative comparisons at constant plasma frequency and increasing oscillator frequency show a gradual decrease in wavelength and a slight decrease in amplitude of the oscillatory part of the wake potential, as well as a systematic decrease in screening of the near-field next to the projectile. These findings can be expected on the basis of the Drude-Lorentz formula for the effective resonance frequency. We find a distinct dependence of the induced potential on the ion charge as long as the plasma frequency exceeds the oscillator frequency. In the opposite case of a dominating oscillator frequency we find little difference between the field induced by a point charge and that by a neutral atom. As an application area we briefly discuss the proximity effect in the energy loss of molecular ions. We find that the polarization wake modifies the proximity effect, in contrast to the frequently-expressed view that it causes the proximity effect.
机译：从理论上已经研究了由快速非相对论离子诱导的唤醒电势，用于由量子谐波谐振子组成的随机停止介质。主要目的是研究原子结合对费米气体中经常研究的唤醒电势的影响。在恒定等离子频率和增加的振荡器频率下的定量比较显示，波长逐渐减小，唤醒电位的振荡部分的振幅略有减小，并且系统地减小了靠近弹丸的近场的屏蔽。这些发现可以根据有效共振频率的德鲁-洛伦兹公式得出。只要等离子频率超过振荡器频率，我们就会发现感应电势对离子电荷有明显的依赖性。在主导频率的相反情况下，我们发现由点电荷和中性原子引起的场之间几乎没有差异。作为应用领域，我们简要讨论分子离子能量损失中的邻近效应。我们发现极化尾波会改变邻近效应，这与经常引起偏振效应的观点相反。

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