[Imgcif-l] Polarization flashbacks

[Graeme.Winter at Diamond.ac.uk]

Hi Folks,

As a part of my ongoing struggle to make sense of imgCIF I have found my way to the definitions of polarization. Looking at some decade-old imgCIF-l discussions it seems that the definitions were chewed over in the last millennium and have not really changed a lot since.

However as was discussed before the definitions are defined in terms of the incoming and diffracted rays, which is poorly defined if we have several diffracted rays.

Not wishing to get an argument going about the right  / wrong way to express the fraction, the polarization plane does need to be defined in a useful way which depends on the agreed reference frame i.e. the principle scan axis and beam - in the case of a well aligned synchrotron I guess the plane normal would be approximately coincident with Y however there is no way to write this down.

At least, none that I could see in the big book.

Is there one?

Many thanks,

Graeme

Dr. Graeme Winter
Senior Software Scientist
Diamond Light Source

+44 1235 778091 (work)
+44 7786 662784 (work mobile)





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