Spectroscopy. Atoms and Light. Atomic electron energy levels are a source of discrete photon energies. Change from a high to low energy state produces a photon. Atoms can also absorb a photon to excite an electron. Discrete Spectrum. Each atom has its own set of energy levels.
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Internuclear distances are quantized in discrete states.
Angular momentum for the molecule is quantized.
Rotational energyMolecular Spectra
Fluorescence typically involves three steps.
Excitation to higher energy state.
Loss of energy through change in vibrational state
Emission of fluorescent photon.Fluorescence