Harmonic Oscillator, Radiation, Quantum Physics.
Consider an electron in a one-dimensional harmonic oscillator potential aligned along the x-axis. The unperturbed energy eigenvalues of the system are En = (n + 1/2) ̄h ω0, where ω0 is the frequency of the corresponding classical oscillator. Here, the quantum number n takes the values 0, 1, 2, · ·