It is already vertical, relative to the real part of Fa (in red), i.e. the
blue vector is always vertical to the red vector in this picture (and
counter-clockwise).
Yong
William Scott <[log in to unmask]>
Sent by: CCP4 bulletin board <[log in to unmask]>
10/13/2010 01:48 PM
Please respond to
William Scott <[log in to unmask]>
To
[log in to unmask]
cc
Subject
[ccp4bb] embarrassingly simple MAD phasing question
Hi Citizens:
Try not to laugh.
I have an embarrassingly simple MAD phasing question:
Why is it that F" in this picture isn't required to be vertical (purely
imaginary)?
http://www.doe-mbi.ucla.edu/~sawaya/tutorials/Phasing/phase.gif
(Similarly in the Harker diagram of the intersection of phase circles, one
sees this.)
I had a student ask me and I realized that there is this fundamental gap
in my understanding.
Many thanks in advance.
-- Bill
William G. Scott
Professor
Department of Chemistry and Biochemistry
and The Center for the Molecular Biology of RNA
228 Sinsheimer Laboratories
University of California at Santa Cruz
Santa Cruz, California 95064
USA
phone: +1-831-459-5367 (office)
+1-831-459-5292 (lab)
fax: +1-831-4593139 (fax)
|