quantum mechanics - Probability of non-normalizable states

In the book Quantum Field Theory by Jakob Schwichtenberg, he is discussing about non-normalizable states in chapter 8. If you compute the normalization in $(8.67)$ you just get infinity. He said on

Probability amplitude - Wikipedia

Physics 3 for Electrical Engineering Ben Gurion University of the

PDF) Non-unitary evolution of a pure state into a mixed state in

Wavepackets etc. Plane wave eigenstates: scattering states non

The wave function for a particle in one dimension is Psi(x) = Ax

Scattering States - TN2304 Kwantummechanica 1

Notes on Quantum Mechanics

Can there be a quantum state that is a superposition of two or

Notes on Quantum Mechanics

Solved (15 points) Encounter with a semi-infinite potential