One example of this phenomenon is observed in the behavior of electrons in a magnetic field. When a magnetic field is applied to a system of electrons, their energies become quantized, and they occupy different energy levels. The lowest energy level corresponds to the ground state, which has a spherically symmetric probability density distribution.

When an external electromagnetic field is applied to the system, the electrons can be excited to higher energy levels, such as the first excited state, which has a ring-shaped probability density distribution. The combination of these two states can lead to a time-dependent probability density distribution, which oscillates between the two spatial structures.

This phenomenon is known as magnetic resonance, and it has important applications in magnetic resonance imaging (MRI) technology, which is used in medical diagnosis. In MRI, a strong magnetic field is used to excite the electrons in the atoms of the patient's body, and the resulting time-dependent probability density distribution is used to create a detailed image of the internal structures of the body.
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