An anharmonic oscillator is a type of oscillator whose potential energy deviates from the simple harmonic form, typically characterized by terms beyond the quadratic term in its Taylor expansion. This deviation leads to non-uniform spacing of energy levels, unlike a quantum harmonic oscillator where energy levels are equally spaced. Anharmonic oscillators are important in various physical systems, including molecular vibrations and lattice dynamics, as they account for real-world behaviors that harmonic models cannot accurately describe.
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