In reply to  Bob Cook's message of Mon, 14 Dec 2015 19:29:26 -0800:
Hi,
[snip]
>>>>>IMO free electrons have no magnetic moment, because they have no "spin", 
>>>>>which
>is not an intrinsic property of the electron, but rather a direct 
>consequence of
>being bound to an atom.<<<<
>
>Now I would say that is a departure from conventional thinking.

Yup.

>
>Can you further explain this conclusion?  I would guess that you would say 
>that an electron has no intrinsic angular momentum as well as photons having 
>none.

No, I think photons do have angular momentum, though I don't think electrons do.
But it's just a hunch. One of the things that makes me think this is the fact
when a free electron circles in a magnetic field, you get cyclotron radiation,
but I would expect line splitting of the cyclotron frequency if free electrons
also had an intrinsic magnetic moment. 

>
>Bob Cook
Regards,

Robin van Spaandonk

http://rvanspaa.freehostia.com/project.html

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