Electron spectroscopy refers to a set of techniques used to analyze the elemental and chemical composition of materials by measuring the energy and intensity distribution of electrons emitted from their surfaces. In the context of cement and concrete, electron spectroscopy, including techniques like X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES), provides invaluable insights into the surface chemistry and composition of cementitious materials. These analyses are crucial for understanding the hydration products, the effectiveness of additives, and the degradation processes that occur in concrete, especially under severe environmental conditions such as corrosive or highly variable climates.