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arXiv physics/0407140physics.atom-phphysics.acc-ph
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离子-原子碰撞电离的标度和公式截面

Scaling and Formulary cross sections for ion-atom impact ionization

Igor D. Kaganovich, Edward Startsev, Ronald C. Davidson

摘要:

离子-原子电离截面的值对于利用快速离子通过物质的传播的许多应用是经常需要的。当没有实验数据和理论计算时,经常使用近似公式。本文简要地总结了截面计算的最重要的理论成果和方法,以便将讨论放在历史的角度,并提供一个简明的介绍主题。基于实验数据和理论预测,提出了一种新的电离截面拟合方法。几个常用的近似(经典轨迹,玻恩近似,等等)的有效性和准确性的范围进行了讨论,作为例子,电离截面的氢和氦原子的各种完全剥离离子。

英文摘要:

The values of ion-atom ionization cross sections are frequently needed for many applications that utilize the propagation of fast ions through matter. When experimental data and theoretical calculations are not available, approximate formulas are frequently used. This paper briefly summarizes the most important theoretical results and approaches to cross section calculations in order to place the discussion in historical perspective and offer a concise introduction to the topic. Based on experimental data and theoretical predictions, a new fit for ionization cross sections is proposed. The range of validity and accuracy of several frequently used approximations (classical trajectory, the Born approximation, and so forth) are discussed using, as examples, the ionization cross sections of hydrogen and helium atoms by various fully stripped ions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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