Re: Query about intrinsic verus orbital angular momentum


Related to this, how do we "know" that intrinsic spin does not in fact
involve rotation on an exceptionally small scale beyond the direct reach
of our experimentation? =A0Is this just supposition?


Ultimately, one should address these issues from the
point of view of quantum field theory.

But, I think a decisive argument - strictly in the context
of non-relativistic quantum mechanics - is simply that one
can show angular momentum of the r x p type (associated
with rotation) can have only integer quantum numbers. The
electron, of course has half-integer quantum numbers; its
spin angular momentum must therefore be interpreted in some
other way.

charlie

.

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