The Absorption Process for Electron Excitation is a fundamental mechanism in quantum mechanics describing the transition of an electron from a lower energy eigenstate to a higher one upon interaction with incident photons carrying discrete quanta of electromagnetic radiation. This process strictly obeys the conservation of energy, where the absorbed photon frequency must precisely match the energy difference between quantized atomic orbitals defined by the Bohr model and Schrödinger equation solutions. As a core phenomenon within spectroscopy and quantum optics, it establishes the probabilistic framework for electronic transitions characterized by selection rules regarding angular momentum and parity changes.
Prerequisite chain context: requires Ground State Energy Level Concept in Atoms.