论文标题
光电离截面和时间延迟中的形状共振
Shape resonances in photoionization cross sections and time delay
论文作者
论文摘要
原子和分子光离子化的形状共振是由离子电势的特定几何形状引起的，该几何形状在特定的部分波中以准绑定的光电状态将后退光电子捕获。这种机制使我们能够通过简单公式$σ\ propto \ sin^2Δ_\ ell $将共振区域中的光电离横截面与光电子散射阶段连接到光电子散射阶段。由于这种关系，可以从实验已知的横截面中提取相$δ_\ ell $，然后转换为光电组组延迟（wigner Time延迟）$τ_{\ rm w} = \ rm w} = \partialΔ__\ ell/\ ell/\ ell/\ ell/\ partial e $，这是最近开发开发的激光激光erser raser Ential e $。光电离横截面和时延迟的直接连接是形状共振的基本特性，可以全面测试针对大量较旧的同步加速器数据的新型测量。
Shape resonances in photoionization of atoms and molecules arise from a particular geometry of the ionic potential which traps the receding photoelectron in a quasi-bound state in a particular partial wave. This mechanism allows us to connect the photoionization cross section in the resonant region with the photoelectron scattering phase in this partial wave by a simple formula $σ\propto \sin^2δ_\ell$. Due to this relation, the phase $δ_\ell$ can be extracted from an experimentally known cross section and then converted to the photoelectron group delay (Wigner time delay) $τ_{\rm W} = \partial δ_\ell/\partial E$ which is measurable by recently developed laser interferometric techniques. Such a direct connection of the photoionization cross section and the time delay is a fundamental property of shape resonances which provides a comprehensive test of novel measurements against a large body of older synchrotron data.
