Quantum Optics
Doppler broadening refers to the phenomenon where the spectral lines of light emitted or absorbed by atoms or molecules are spread out or broadened due to the relative motion of these particles. This effect occurs because particles in a gas or a plasma have a range of velocities, leading to variations in the observed frequency of light as they move towards or away from an observer. This is particularly important when considering the interaction of light with atoms in contexts such as light shifts and the AC Stark effect.
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