In this Letter, we investigate the time delay of photoelectrons by fullerenes shell in endohedrals. We present general formulas in the frame of the random phase approximation with exchange (RPAE) applied to endohedrals A@C_N that consist of an atom A located inside of a fullerenes shell constructed of N carbon atoms C. We calculate the time delay of electrons that leave the inner atom A in course of A@C_N photoionization. Our aim is to clarify the role that is played by C_N shell, its static potential, and polarization. As concrete examples of A, we have considered Ne, Fr, Kr and Xe, and as fullerene we take C₆₀. The presence of the C₆₀ shell manifests itself in powerful oscillations of the time delay τ_nl(ω) of an electron that is ionized from a given subshell nl by a photon with energy ω. Calculations are performed for outer, subvalent and d-subshells.

在这封信中，我们研究了内面体中富勒烯壳层对光电子的延迟。我们在应用于包含N个碳原子C的富勒烯壳内部的原子A的内面体A @ C _N的交换随机相近似框架（RPAE）中，给出了通式。我们计算电子的时间延迟在A @ C _N光电离过程中留下内部原子A。我们的目的是弄清C _N壳所起的作用，其静态电势和极化。作为A的具体示例，我们考虑了Ne，Fr，Kr和Xe，作为富勒烯，我们采用C ₆₀。C ₆₀外壳的存在表现为时间延迟的剧烈振荡τ _NL（ω），其从给定的子shell电离电子的NL通过用能量的光子ω。对外部，次等和d- subshel​​l进行计算。