The Lyman series refers to a series of spectral lines corresponding to electronic transitions in the hydrogen atom. Specifically, it consists of transitions where an electron moves from a higher energy level (n ≥ 2) down to the ground state (n = 1). These transitions emit ultraviolet light, and the wavelengths of the emitted photons can be calculated using the Rydberg formula.
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Hydrogen atom spectral lines terminating at principal quantum number ; see the Bohr model for the elementary energy difference calculation.