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Re: polarization
- To: imgcif-l@bnl.gov
- Subject: Re: polarization
- From: "I. David Brown" <idbrown@mcmail.cis.McMaster.CA>
- Date: Tue, 12 Sep 2000 09:02:53 -0400 (EDT)
- In-Reply-To: <Pine.OSF.3.95.1000911173013.19465D-100000@alf1.mrc-lmb.cam.ac.uk>
The item > _diffrn_radiation.polarisation_collimation - this takes an argument > (modifier?), examples of which are; > > pinhole or mirrors with unpolarised beam > graphite monochromator > synchrotron is not currently defined in the CIF dictionaries. Perhaps it should be. This discussion shows that we need to rethink the way we define polarisation (or polarization). I would welcome proposals for definitions for a set of polarization items that would be applicable to all types of instrument. This would then be incoporated in the CORE dictionary to replace the existing two items. David Brown Chair of Comcifs and the CORE Dictionary Maintenance Group ***************************************************** Dr.I.David Brown, Professor Emeritus Brockhouse Institute for Materials Research, McMaster University, Hamilton, Ontario, Canada Tel: 1-(905)-525-9140 ext 24710 Fax: 1-(905)-521-2773 idbrown@mcmaster.ca *****************************************************
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