Question

how is the spectrum explained quantum mechanically?

Answer 1

Explanation:

In quantum mechanics, the discrete spectrum of an observable corresponds to the eigenvalues of the operator used to model that observable. According to the mathematical theory of such operators, its eigenvalues are a discrete set of isolated points, which may be either finite or countable.

Erwin Schrödinger proposed the quantum mechanical model of the atom, which treats electrons as matter waves. ... Electrons have an intrinsic property called spin, and an electron can have one of two possible spin values: spin-up or spin-down. Any two electrons occupying the same orbital must have opposite spins.

Answer 2

Answer:

In quantum mechanics, the discrete spectrum of an observable corresponds to the eigenvalues of the operator used to model that observable