Atoms with 1 electron: Schrödinger equation; relationship between magnetic dipole moment and angular momentum, the Stern-Gerlach experiment, spin-orbit interaction, fine and hyperfine structure, Zeeman and Stark effects, interaction with the electromagnetic radiation field - emission and absorption of radiation, radiative transitions and selection rules. Atoms with several electrons: the central field approximation, electronic configurations and spectroscopic notation, spin-orbit interaction, LS and j-j coupling, optical and X-ray spectra, Zeeman and Paschen-Back effects. Molecules: The molecular bonding, electronic structure of diatomic molecules, the H2+ molecular ion, the hydrogen molecule, complex molecules. Molecular spectra: rotational and vibrational levels, electronic spectra. Transitions between atomic and molecular levels; Definition of cross section. Lasers: conditions for laser emission, absorption and gain coefficients, amplitude and phase of laser light.

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