In the context of core-resonant ionization of helium atom the inclusion of the He–He⁺(2p) ionization channel sets off a quantum mechanical interference between two competing pathways, He–He⁺(1s)–He⁺(2p) and He–He⁺(2p) (He–He⁺(1s) and He–He⁺(2p)–He⁺(1s)), thereby significantly modifying the line shape of the photoelectron spectrum. The signature of this interference arises as an asymmetry in the line shape of the multi-peak photoelectron spectra. On account of the discrepancies over the magnitude of the two photon photoionization cross section for the He–He⁺(2p) ionization channel the calculations have been performed for three different magnitudes of this photoionization cross section and the findings confirm that asymmetry in the line shape is prevalent for all the chosen cross sections. However, the magnitude of asymmetry depends on the magnitude of the photoionization cross section for the He–He⁺(2p) ionization channel. It is also interesting to note that at the considered laser peak intensities in this work an additional ionization channel from excited ionic state of helium plays a significant role in influencing the line shape of the photoelectron spectrum. The effects of pulse duration on the line shape of the photoelectron spectrum and the possibility to control the interference induced asymmetry in the multi peak line shape has also been investigated.

在氦原子的核心共振电离的背景下，包含 He–He ⁺ (2p) 电离通道会引发两个竞争途径 He–He ⁺ (1s)–He ⁺ (2p) 和 He之间的量子力学干扰–He ⁺ (2p) (He–He ⁺ (1s) 和 He–He ⁺ (2p)–He ⁺ (1s))，从而显着改变光电子光谱的线形。这种干涉的特征是多峰光电子谱线形状的不对称性。由于 He–He ⁺的两个光子光电离截面的大小存在差异(2p) 电离通道 已针对该光电离横截面的三个不同量级进行了计算，结果证实线形状的不对称性对于所有选定的横截面普遍存在。然而，不对称的大小取决于 He–He ⁺ (2p) 电离通道的光电离截面的大小。有趣的是，在这项工作中考虑的激光峰值强度下，来自氦激发离子态的额外电离通道在影响光电子光谱的线形方面起着重要作用。还研究了脉冲持续时间对光电子光谱线形的影响以及控制多峰线形中干扰引起的不对称性的可能性。