Measuring the momentum and energy distribution of photoemitted correlated electron pairs is a promising approach to directly probe the nature of electron–electron interactions in quantum materials. In this work, we present a two electron angle resolved photoemission spectroscopy (2e-ARPES) setup based on two time-of-flight (TOF) analyzers and a gas fiber high-harmonic generation (HHG) extreme ultraviolet (XUV) source. For each incident XUV pulse, the system is capable of recording six-dimensional coincidence datasets (kinetic energy and two orthogonal momenta for each electron) with an unprecedented double photoemission energy resolution of $<$ 25 meV. The two TOF analyzers permit measurements of correlated electron pairs with momentum separation of $\sim 2{\text{Å}}^{-1}$. The performance of the setup is demonstrated by both single and double photoemission measurements, with an emphasis on the coincidence acquisition electronics and data extraction procedure for isolating correlated pair emission.

测量光发射相关电子对的动量和能量分布是直接探测量子材料中电子-电子相互作用本质的一种有前途的方法。在这项工作中，我们提出了基于两个飞行时间（TOF）分析仪和气体光纤高次谐波发生（HHG）极紫外（XUV）源的二电子角分辨光电子能谱（2e-ARPES）装置。对于每个入射 XUV 脉冲，该系统能够记录六维重合数据集（每个电子的动能和两个正交动量），其前所未有的双光电发射能量分辨率为$<$25兆伏。两台 TOF 分析仪可测量动量分离的相关电子对$～2{\text{A}}^{-1}$。该装置的性能通过单光电发射测量和双光电发射测量来证明，重点是符合采集电子设备和用于隔离相关对发射的数据提取程序。