Interaction effects can change materials properties in intriguing ways, and they have, in general, a huge impact on electronic spectra. In particular, satellites in photoemission spectra are pure many-body effects, and their study is of increasing interest in both experiment and theory. However, the intrinsic spectral function is only a part of a measured spectrum, and it is notoriously difficult to extract this information, even for simple metals. Our joint experimental and theoretical study of the prototypical simple metal aluminum demonstrates how intrinsic satellite spectra can be extracted from measured data using angular resolution in photoemission. A nondispersing satellite is detected and explained by electron–electron interactions and the thermal motion of the atoms. Additional nondispersing intensity comes from the inelastic scattering of the outgoing photoelectron. The ideal intrinsic spectral function, instead, has satellites that disperse both in energy and in shape. Theory and the information extracted from experiment describe these features with very good agreement.

相互作用效应可以以有趣的方式改变材料特性，并且通常对电子光谱产生巨大影响。特别是，光发射光谱中的卫星是纯粹的多体效应，它们的研究在实验和理论方面都越来越引起人们的兴趣。然而，本征光谱函数只是测量光谱的一部分，而且即使对于简单的金属，提取该信息也非常困难。我们对原型简单金属铝的联合实验和理论研究证明了如何使用光电发射中的角分辨率从测量数据中提取固有卫星光谱。非色散卫星是通过电子-电子相互作用和原子的热运动来检测和解释的。额外的非色散强度来自出射光电子的非弹性散射。相反，理想的固有光谱函数具有能量和形状都分散的卫星。理论和从实验中提取的信息对这些特征的描述非常一致。