The Lyman series is a significant topic in physics and chemistry that deals with the transitions and the resulting ultraviolet emission lines of the hydrogen atom. These transitions occur when an electron moves from a higher energy level (n = 2) to the lowest energy level (n = 1). The various transitions are designated by Greek letters, with the transition from n = 2 to n = 1 known as Lyman-alpha, followed by Lyman-beta (n = 3 to n = 1) and Lyman-gamma (n = 4 to n = 1). The Lyman series is named after its discoverer, Theodore Lyman, and is crucial for understanding spectroscopy and the quantum mechanical properties of atoms. This textbook provides a comprehensive analysis of the Lyman series and its applications in modern science.