近日，美国内布拉斯加大学的H. B. Ambalampitiya与J. M. Ngoko Djiokap合作并取得一项新进展。经过不懈努力，他们对一氧化碳的不对称光电子动量分布进行研究。相关研究成果已于2024年4月8日在国际知名学术期刊《物理评论A》上发表。

该研究团队在一氧化碳单光子线性电离过程中，针对相对于分子轴的线性偏振矢量的不同方向，深入研究了光电子动量分布（PMD）。当脉冲带宽超过最高占据分子轨道（HOMO）与HOMO-1之间的能隙时，观察到PMD融合了HOMO和HOMO-1的特征，这是由于电子从这些初始轨道发射所致。

研究团队发现，在PMD中，HOMO的不对称性在任何分子取向下都表现得尤为显著。本研究中，PMD的前后不对称性和归一化不对称性被用作混合程度的探针。

附：英文原文

Title: Asymmetric photoelectron momentum distribution of carbon monoxide

Author: H. B. Ambalampitiya, J. M. Ngoko Djiokap

Issue&Volume: 2024/04/08

Abstract: The photoelectron momentum distribution (PMD) for the linear (in intensity) process of one-photon single ionization of carbon monoxide is examined in the polarization plane for several orientations of the linear polarization vector with respect to the molecular axis. For a pulse bandwidth broader than the energy gap between the highest occupied molecular orbital (HOMO) and HOMO-1, the PMD is found to be mixed with HOMO and HOMO-1 signatures because electrons are emitted from these initial orbitals. We show that the asymmetry of the HOMO is strongly revealed in the PMD for any molecular orientation. The backward-forward asymmetry in the PMD and the normalized asymmetry are used as probes of the degree of mixing.

DOI: 10.1103/PhysRevA.109.043108

Source: https://journals.aps.org/pra/abstract/10.1103/PhysRevA.109.043108