In quantum mechanics, a stationary state is an eigenvector of the Hamiltonian, implying the probability density associated with the wavefunction is independent of time. This corresponds to a quantum state with a single definite energy (instead of a probability distribution of different energies). It is also called energy eigenvector, energy eigenstate, energy eigenfunction, or energy eigenket. It is very similar to the concept of atomic orbital and molecular orbital in chemistry, with some slight differences explained below.
Read more about Stationary State: Introduction, Stationary State Properties, Spontaneous Decay, Comparison To "orbital" in Chemistry
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