On confinement resonances in A@C60 photoionization: easy to observe?

On the strong influence of inner shell resonances upon the outer shell photoionization of endohedral atoms

It is demonstrated by the example of the Xe atom stuffed inside the C60 fullerene, that the so-called confinement resonances in 4d subshell strongly affect the photoionization cross-section of outer 5p and subvalent 5s electrons near 4d ionization threshold. It is a surprise that these narrow inner 4d shell resonances are not smeared out in the outer shell photoionization cross-section. On the contrary; the inner shell resonances affect the outer cross-section by enhancing them enormously. Close to its own photoionization thresholds, 5p and 5s photoionization cross-sections of Xe endohedral ar…

Ce $^{3+}$ - Ce $^{4+}$的光电离

Photoionization of Ce$^{3+}$ - Ce$^{4+}$

用无规相位近似交换法研究了Ce $^{3+}$ - Ce $^{4+}$过程在100-150 eV能区的光电离.将我们的结果与最近的测量结果进行比较[Müller { \it et al}，Phys. Rev. Lett. { \bf 101}，133001（2008）]证实了碳笼在内嵌富勒烯Ce@C $_{82}^+$光电离中的抑制作用。讨论了约束共振产生的原因及抑制效果。

C_{60}富勒烯中受限原子光电离的交换随机相位近似

Random phase approximation with exchange for the photoionization of confined atoms: Xe in C_{60} fullerene

用无规相位交换近似（RPAE）方法研究了C $_{60}$中束缚态原子的光电离。$_{60}$富勒烯被描述为具有势能$V(r)$的有吸引力的短程球阱，对于$r_i<r<r_0$由$V(r)=-V_ 0$给出，否则由$V(r)=0$给出，其中$r_i$和$r_0$分别是球壳的内径和外径。本文用正则解和非正则解以及在$r_i$和$r_0$处的连续边界条件求解薛定谔方程，得到了波函数在$r<r_i$、$r_i<r<r_0$和$r>r_0$三个区域的径向分量。评估了Xe@C $_{60}$内嵌分子中Xe 4d、$5s$和$5p$电子的光电离截面，并与自由Xe原子的光电离截面和Xe@C $_{60}$富勒烯的其他先前计算进行了比较。我们的方法克服了以前的模型势计算的弱点，并证明了显着更强的相关约束共振的C @C $_{60}$光电离。

Elucidating Fermi's Golden Rule via bound-to-bound transitions in a confined hydrogen atom

We demonstrate an effective method for calculating bound-to-continuum cross-sections by examining transitions to bound states above the ionization energy that result from placing the system of interest within an infinite spherical well. Using photoionization of the hydrogen atom as an example, we demonstrate convergence between this approach for a large volume of confinement and an exact analytical alternate approach that uses energy-normalized continuum wavefunctions, which helps to elucidate the implementation of Fermi's Golden Rule. As the radius of confinement varies, the resulting changes…

镉的磁光俘获

Magneto-optical Trapping of Cadmium

本文报道了镉原子在磁光阱中的激光冷却和约束，并描述了背景镉蒸气的加载过程。捕获激光在229 nm处驱动双电子原子的1 S 0 - 1 P1跃迁，并直接从1 P1态光电离原子。这种光致电离消除了其他的损耗机制，并允许直接测量光致电离的截面，我们测得它距离1 P1态为2（1）× 10 ^（-16）cm^（2）。当与附近的激光冷却和捕获的Cd^（+）离子结合时，该装置可以促进原子和离子之间的超冷相互作用的研究。

Polarization of the C$_{60}$ cage by the photoelectron, interior static polarization of C$_{60}$ by the ion-remainder and atomic-core relaxation in $A$@C$_{60}$ photoionization

Photoionization cross sections, photoelectron angular-asymmetry parameters and photoionization time delays for $A$@C$_{60}$ endohedral atoms are studied with account for both the individual and combined effects of dipole static polarization (DSP) of C$_{60}$ by the outgoing photoelectron, interior static polarization (ISP) of C$_{60}$ by the ion-remainder, $A^{+}$, and atomic-core relaxation of the encapsulated atom upon its ionization. It is unraveled that the DSP effect is weak; it changes the phase of confinement-resonant oscillations in $σ_{n\ell}$, $β_{n\ell}$ and $τ_{n\ell}$ without gene…

共振光电离与时间延迟

Resonant photoionization and time delay

本文综述了共振光电离与时间延迟的关系，通过分析光电离振幅的解析性质，建立了共振时间延迟与光电离截面的联系，并探讨了双光子共振光电离过程及相关测量技术。