Thaks! typo- h,0,l not h,0,k
I have not registered for editing on that wiki,
so I was hoping someone else would take care of it.
But it seems all that's needed is to confirm your account, so I'll register and
give it a try. Hope I don't make things worse!
(what is this urldefense.proofpoint? did my institution add that, or JISCMAIL?)
On 03/02/2019 05:28 PM, Dale Tronrud wrote:
You are correct, other than your typo. The centric zone in a
monoclinic space group (B setting) is h0l.
This web site is a wiki so you should be able to correct it yourself.
Dale Tronrud
On 3/2/2019 2:00 PM, Edward A. Berry wrote:
The wiki:
https://urldefense.proofpoint.com/v2/url?u=https-3A__strucbio.biologie.uni-2Dkonstanz.de_ccp4wiki_index.php_Centric-5Fand-5Facentric-5Freflections&d=DwICaQ&c=ogn2iPkgF7TkVSicOVBfKg&r=cFgyH4s-peZ6Pfyh0zB379rxK2XG5oHu7VblrALfYPA&m=HENAQrgItEIhnnUZhWe8GMKW5sRX2v7V-rsby0AB7LQ&s=8D9Gvr-8AQeITEdUbf2xeIBDNzdTzUTnE78AI70O1J0&e=
says:
"A reflection is centric if there is a reciprocal space symmetry
operator which maps it onto itself (or rather its Friedel mate).
. . .
Centric reflections in space group P2 and P21 are thus those with 0,k,0."
The operator -h,k,-l does NOT take 0,k,0 to its Friedel mate.
it takes h,0,k to their Friedel mates. In other words the plane
perpendicular to the 2-fold axis, at 0 along the axis
Or am I missing something?
eab
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