Discussion Group B4

Discussion Leaders

• Max Wolf

Discsussion Notes

• There is a huge potential and a lot of possible applications of GISAS from different fields such as self assembly, magnetism, superconductivity, biology, solid-liquid boundaries and dynamics or surface exitations which have been identified.
• Past GISAS studies tend to apply "conventional - quasi kinematic" scattering techniques to grazing incidence geometery.
• Only a few studies take advantaged of Yoneda scattering
• The opportunity of specially designed samples for channeling waves should be investigated.
• For depth resolved measurements of two surfaces in contact with each other the resolution function needs to be known extremely well. Tails of the resolution function must be avoided.
• Information and specification of current instrumentation is not standardized and summarized.
• There are simulation tools out there such as: Bornagain, FitGISAS, ISGISAXS, PyGISAXS and HIGISAXS. There nonetheless remains a large and pressing need for better theoretical understanding and analysis methods.
• "Education" beyond the kinematic theory is limited.

The Session identified this as an area appropriate for a new working group with following staged activities:

1. Round Robin sample (CdSe particles in polymer on CrAu)
2. Analysis and new opportunities
   1. Analysis - can we go beyond DWBA?
   2. wave amplitude amplification and explore channeling
3. How to distribute data: Corrected? Transformed? What is Q? Should it be defined in the laboratory frame or the sample frame?
4. Teaching of dynamical theory

Initial members:

• Ronald Jones (NIST, Chair)
• Max Wolff (Uppsala University)
• Alex Hexemer (Berkeley Light Source)
• Andrew Nelson (ANSTO)
• Henrich Frielinghaus (JCNS)