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Re: Draft changes to Core data names for multiplicity etc.
- To: Distribution list of the IUCr COMCIFS Core Dictionary Maintenance Group <coredmg@iucr.org>
- Subject: Re: Draft changes to Core data names for multiplicity etc.
- From: Howard Flack <Crystal@Flack.ch>
- Date: Wed, 16 May 2012 19:27:14 +0200
- In-Reply-To: <20120516103234.GA13856@emerald.iucr.org>
- References: <20120516103234.GA13856@emerald.iucr.org>
On 16.05.2012 12:32, Brian McMahon wrote: > The expression for a structure factor I think this should be "The expression for the structure-factor amplitude" > This may contain dispersion contributions I object to the use of the term "dispersion". Current usage favours "resonant-scattering" although some use "anomalous-scattering" despite there being nothing anomalous about the phenomenon. > F(000) = [ (sum f~r~)^2^ + (sum f~i~)^2^ ]^1/2^ From this definition, F(000) is non-negative definite i.e. it is zero or positive, i.e. it is an amplitude, consequently > non-dispersive F(000) (which may be negative) makes no sense. H. _______________________________________________ coreDMG mailing list coreDMG@iucr.org http://mailman.iucr.org/mailman/listinfo/coredmg
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