Unless there is pseudo-symmetry, I would say that the self-rotation indicates that crystal point group is 422... Did the indexing program suggested something with this symmetry?
Cheers, Miguel 2007/8/20, Wim Burmeister <[EMAIL PROTECTED]>: > > Yanming Zhang a écrit : > > Hi, > > > > Would some experts help me to interpretate the attached self rotation > > function ps graph? The cell: 84.847 84.847 172.485 P4 indexing. In > > perticular, I was puzzled by: > > > > 1,Does the peak (90 45 180) a crystallographic 2-fold or > > non-crystallographic 2-fold? > > 2,Why there is no crystallographic peak on the section kappa=90? > > Giving P4 space group, there should be some high crystallographic > > 4-fold peaks appear on the section. > > > > It probably takes you only 5 minutes. Your help is greatly appreciated. > > > > Yanming > Deqr Yanming > The north pole of the diagramm corresponds to the direction of the z > axis. There is well a crystallographic 4-fold (and automatically 2- > fold) peak in this direction. Then there are non-crystallographic 2-fold > axes in the x,y plane, spaced by 45 degrees, as all the peaks appear to > have the same height. > > > > Greetings > > Wim Burmeister > > -- > > ******************************************************************************* > Wim Burmeister > Professeur, Membre de l'Institut Universitaire de France > Unit of Virus Host Cell Interactions (UVHCI) UMR5233 UJF-EMBL-CNRS > 6 rue Jules Horowitz > B.P. 181, F-38042 Grenoble Cedex 9 FRANCE > E-mail: [EMAIL PROTECTED] > Tel: +33 (0) 476 20 72 82 Fax: +33 (0) 476 20 94 00 > http://www2.ujf-grenoble.fr/pharmacie/laboratoires/gdrviro > > ******************************************************************************* > -- correo-e: [EMAIL PROTECTED] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Je suis de la mauvaise herbe, Braves gens, braves gens, Je pousse en liberté Dans les jardins mal fréquentés! Georges Brassens
