Electrons in atoms and molecules can change or make transitions in energy levels by emitting or absorbing a photon or of electromagnetic radiation. In this video we will discuss the energy level of the electron of a hydrogen atom. The emission spectrum of atomic hydrogen has been divided into a number of spectral series, with wavelengths given by the Rydberg formula. These observed spectral lines are due to the electron making transitions between two energy levels in an atom. The classification of the series by the Rydberg formula was important in the development of quantum mechanics. The spectral series are important in astronomical spectroscopy for detecting the presence of hydrogen and calculating red shifts. In the Bohr model, the Lyman series includes the lines emitted by transitions of the electron from an outer orbit of quantum number n larger than 1 to the first orbit of quantum number n' = 1. The Balmer series includes the lines due to transitions from an outer orbit n larger than 2 to the orbit n' = 2. The Paschen lines all lie in the infrared band.

Cinematic (Sting) by Twin Musicom is licensed under a Creative Commons Attribution 4.0 licence. https://creativecommons.org/licenses/by/4.0/

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Thumbnail: Quantum Physics - Transitions between energy levels