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Schrödinger [1927] and Compton [1929] on directionality and localization
“The direction and frequency laws of the
Compton effect have exactly the same
meaning as stating that the pair of light
waves and ψ-waves have the same ‘net of
planes’ (on a moving crystal) for the first
order Bragg condition of reflection, as
they move with a subluminar velocity.…”
[ E. Schrödinger, Über den Comptoneffekt. Ann.
Phys. (4) 82, 257-264 (1927) . Fig. 2.]
“There are certain localized
regions in which at a certain
moment energy exists, and this
may be taken as a definition of
what me mean by a particle. …
this wave-mechanics theory does
not enable us to locate a photon or
an electron definitely except at
instant at which it interact with
another particle. When it activates
a grain on a photographic plate,
or ionizes an atom which may be
observed in a cloud chamber, we
can say that the particle was at
that point. But in between such
events the particle cannot be
definitely located.”
[ A. H. Compton, The corpuscular properties
of light. Rev. Mod. Phys. 1, 74-89 (1929) ]