Because there is never more than one photon "in flight" at any given
time. Even at 1 photon/s, we still eventually get spots.
Atoms also don't emit synchrotron radiation, despite there being charged
particles accelerating around their little "orbits" in there.
But yes, in 1913, people were still hoping there was another explanation
for these two observations, other than that pesky quantum theory. It
was in 1915 that Debye made the key observation that collapsed
determinism as we knew it. I don't think he was very happy about that.
Neither was Einstein.
-James Holton
MAD Scientist
On 4/19/2013 9:43 AM, Tim Gruene wrote:
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Hello Bernhard,
could you explain this? A photon is the exchange particle of the
electromagnetic force, i.e. as soon as you have more than two charged
particles interacting there is more than one photon - why is it
incorrect to use the term "multi-photon process" in the context of
X-ray diffraction?
Cheers,
Tim
On 04/19/2013 06:19 PM, Bernhard Rupp (Hofkristallrat a.D.) wrote:
However, a reviewer could reject the method on theoretical grounds
- the explanation of X-ray diffraction as a multi-photon process is
not correct....
BR
-----Original Message----- From: CCP4 bulletin board
[mailto:[email protected]] On Behalf Of Peter Artymiuk Sent:
Friday, April 19, 2013 7:11 AM To: [email protected] Subject:
Re: [ccp4bb] popular piece on X-ray crystallography
Just to clarify, Jeremy was not being serious, but imagining what
an awkward / obnoxious grant reviewer might have said in 1913. But
your points would be valuable in rebutting such a view
Pete
On 19 Apr 2013, at 11:28, Navdeep Sidhu wrote:
Dear Pet,
On the contrary, far as I know, nature seems to require most
solids we see around us to be crystalline. And much of the rest
is either gaseous or plasma. Hence, by the reasoning proposed, we
are led to suspect a different conclusion: that it's studies
dealing with the remaining state that have "little general
applicability as the requirement for objects to force themselves
into" the disordered arrays of the liquid state "is an absurd
limitation." (However, I'd support funding it nevertheless.)
Best regards, Navdeep
--- On Fri, Apr 19, 2013 at 10:14:04AM +0100, Peter Artymiuk
wrote:
Another of my colleagues, Jeremy Craven, is an NMR
spectroscopist and
bioinformatician. He is in referee mode at present and comments:
From: Jeremy Craven <[email protected]> Date: 19
April 2013 10:05:18 GMT+01:00 To: Peter Artymiuk
<[email protected]> Subject: Re: Fwd: popular piece
on X-ray crystallography
I suspect this technique will have little general
applicability as the
requirement for objects to force themselves into ordered arrays is
an absurd limitation. I would not support funding it.
Jeremy
I fear he may be right
best wishes Pet
On 19 Apr 2013, at 09:53, David Briggs wrote:
Following on from that - readers may be interested in Stephen
Curry's post in the Guardian, regarding the Crystallography
exhibit at the London Science Museum.
http://www.guardian.co.uk/science/occams-corner/2013/apr/19/1
regards,
Dave
============================ David C. Briggs PhD
http://about.me/david_briggs
On 19 April 2013 09:44, Peter Artymiuk
<[email protected]>
wrote:
Dear all
In Britain there is a free newspaper that you can pick up
on buses
called the Metro. My colleague Geoff Ford pointed out this short
feature on the history X-ray crystallography in last Monday's Metro
newspaper. I think it's rather good.
http://www.cosmonline.co.uk/blog/2013/04/14/conquering-realm-invisi
ble
best wishes Pete
Prof Peter Artymiuk Krebs Institute Department of Molecular
Biology & Biotechnology University of Sheffield Sheffield
S10 2TN ENGLAND
--- Navdeep Sidhu Departments of Structural Chemistry &
Pediatrics II University of Goettingen Office Address: Institute
of Inorganic Chemistry Tammannstrasse 4 37077 Goettingen Germany
Email: [email protected] Phone: +49 551 39 33059 Fax:
+49 551 39 22582 Dept. Homepage: http://shelx.uni-ac.gwdg.de/
---
Prof Peter Artymiuk Krebs Institute Department of Molecular Biology
& Biotechnology University of Sheffield Sheffield S10 2TN ENGLAND
- --
- --
Dr Tim Gruene
Institut fuer anorganische Chemie
Tammannstr. 4
D-37077 Goettingen
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