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:ccp...@jiscmail.ac.uk] On Behalf Of Jacob Keller Sent: Friday, October 15, 2010 11:44 AM To: CCP4BB@JISCMAIL.AC.UK 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
