JPK beats me on this one. Here is the quote from R. W. James, "The
Optical Principles of the Diffraction of X-rays".
"We shall call A the 'structure amplitude', a name introduced by
Ewald, to denote the fact that its value depends essentially on the
structure of the group associated with each lattice-point. It is the
amplitude, at unit distance, of the wave scattered by the unit group
of s points."
-- Jianghai
++++++++++++++++++++
Jianghai Zhu, PhD
Immune Disease Institute
Dept. of Pathology
Harvard Medical School
3 Blackfan Circle, CLSB
Boston, MA 02115
Tel: 617-713-8224
Fax: 617-713-8232
++++++++++++++++++++
On Jan 12, 2009, at 12:43 PM, Jacob Keller wrote:
[King?] James says "structure amplitude."
(1950 ed., Ch II, 1a (p27))
JPK
*******************************************
Jacob Pearson Keller
Northwestern University
Medical Scientist Training Program
Dallos Laboratory
F. Searle 1-240
2240 Campus Drive
Evanston IL 60208
lab: 847.491.2438
cel: 773.608.9185
email: [email protected]
*******************************************
----- Original Message ----- From: "Ethan Merritt" <[email protected]
>
To: <[email protected]>
Sent: Monday, January 12, 2009 10:59 AM
Subject: Re: [ccp4bb] structure (factor) amplitude
On Monday 12 January 2009 02:42:43 Ian Tickle wrote:
Also I did a 'Google vote' for the two terms. 'Structure
amplitude' has
11300 hits. 'Structure factor amplitude' has only 4750. So all
round I
would say that 'structure amplitude' wins by a considerable margin.
The field of crystagooglography is relatively young,
and standard procedures have not yet been established :-)
Here's what I get:
+"structure factor amplitude" 18,000 hits
+"structure amplitude" 17,100 hits
Ethan
Cheers
-- Ian
> -----Original Message-----
> From: [email protected]
> [mailto:[email protected]] On Behalf Of Pavel Afonine
> Sent: 11 January 2009 03:01
> To: Ethan A Merritt
> Cc: [email protected]
> Subject: Re: [ccp4bb] structure (factor) amplitude
>
>
>
> On 1/10/2009 5:14 PM, Ethan A Merritt wrote:
>
> On Saturday 10 January 2009, Bernhard Rupp wrote:
>
>
> Dear All,
>
> I am getting conflicting comments on the use of
> 'structure factor amplitude'
> vs. just
> 'structure amplitude'
> for |F|.
>
>
>
> ???
> That's just... odd.
>
> |F| is the amplitude of F.
> But no way F is a "structure".
>
>
>
> I agree. If F is a structure factor then |F| is a structure
> factor amplitude. "structure amplitude" doesn't make much sense...
> Pavel.
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