> It is well known that QM gives a wave structure of the probability
> density for the presence of a quantum oscillator in a box. Has anyone
> ever checked this?
> I mean has anyone made a straightforward experiment checking if there
> are nodes of zero presence, by example sending a laser beam through
> the nodes expected?
The electron orbitals calculated for the soft-edged box of an atom are
in excellent agreement with experimental observation, which they would
not be without the nodes. See recent articles in Science News and other
science news periodicals about the recent measurement of the shape of
the orbitals in molecular nitrogen.
PD