In temporary sense, the 'at once' I think really means this -
poof - photon gone - pop - photon comes out.
I am afraid one has to absolve oneself from the travelling
photon picture once a QM transition occurs.
br
-----Original Message-----
From: CCP4 bulletin board [mailto:[log in to unmask]] On Behalf Of Jacob
Keller
Sent: Friday, October 15, 2010 11:44 AM
To: [log in to unmask]
Subject: Re: [ccp4bb] quantum diffraction
> >but yes, each "photon" really does interact with
> EVERY ELECTRON IN THE CRYSTAL at once.
A minor point: the interaction is not really "at once," is it? The photon
does have to move through the crystal over a finite time.
JPK
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