惰性气体内原子次价壳层的光电离
On photoionization of the subvalent subshells of noble gas endohedral atoms
摘要：
我们证明了惰性气体（NG）内原子NG@F的次价次壳层的光电离截面中的强干涉图样。这种干涉是三个因素共同作用的结果：相邻原子子壳层的效应、光电子波被富勒烯F壳层反射以及F电子作用下的复合效应对入射光子束的共振修正。我们考虑了Ne、Ar、Kr和Xe惰性气体原子的外ns亚壳层。富勒烯壳层的极化通过F总光吸收截面表示。在所谓的气泡势（一种球形零厚度型势）的框架下，考虑了静态F势的光电子反射。在推导中假设NG位于富勒烯的中心。根据现有的实验数据，还假设富勒烯半径远大于原子半径和富勒烯壳层的厚度。这些假设允许，如最近所证明的，NG@F光电离截面被呈现为NG次价截面和两个计算因子的产物，这两个计算因子考虑了F电子壳层的极化和光电子由富勒烯静电势的反射。
英文摘要：
We demonstrate strong interference patterns in the photoionization cross-section of the subvalent subshells of noble gas (NG) endohedral atoms NG@F. This interference is a result of common action of three factors: the effect of neighboring atomic subshells, reflection of photoelectron waves by the fullerene F shell and resonance modification of the incoming photon beam by the complex effect under the action of the F electrons. We have considered the outer ns-subshells for Ne, Ar, Kr and Xe noble gas atoms. The polarization of the fullerene shell is expressed via the F total photoabsorption cross section. The photoelectron reflection from the static F potential is taken into account in the frame of the so-called bubble potential that is a spherical zero--thickness type potential. It is assumed in the derivations that NG is centrally located in the fullerene. It is assumed also, in accordance with the available experimental data, that the fullerene radius is much bigger than the atomic radius and the thickness of the fullerene shell. These assumptions permit, as demonstrated recently, the NG@F photoionization cross section to be presented as a product of the NG subvalent cross section and two calculated factors that account for polarization of the F electron shell and reflection of photoelectrons by the fullerene static potential.
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