@smk78 & @butlerpd note that there are some confusing statements and missing references in the Guinier-Porod model documentation.
The current documentation replicates that written by Hammouda in 2010 (see Ref 1 here) for Kline's IGOR-based fitting application from NIST.
Both sets of documentation state:
For 3D globular objects (e.g. spheres), s = 0 recovering the standard Guinier formula. For 2D symmetry (e.g. rods) s = 1, and for 1D symmetry (e.g. lamellae or platelets) s = 2.
The assignment of s values to shapes matches the Hammouda reference (see bottom of page 717 here). What seems wrong is the assignment of the symmetry to the shapes; ie, should not rods be 1D and lamellae/platelets be 2D? For that matter, what exactly is meant by 'symmetry' in this context anyway? It might be less confusing to just refer to the shapes and s values and omit all mention of symmetry?
The Sasmodels documentation further states:
overcomes some of the deficiencies of the (Beaucage) unified_power_Rg model
and
(see the Glatter reference below)
Neither reference for Beaucage or Glatter are provided, although Beaucage's Unified model in Sasmodels is linked.
@smk78 & @butlerpd note that there are some confusing statements and missing references in the Guinier-Porod model documentation.
The current documentation replicates that written by Hammouda in 2010 (see Ref 1 here) for Kline's IGOR-based fitting application from NIST.
Both sets of documentation state:
The assignment of s values to shapes matches the Hammouda reference (see bottom of page 717 here). What seems wrong is the assignment of the symmetry to the shapes; ie, should not rods be 1D and lamellae/platelets be 2D? For that matter, what exactly is meant by 'symmetry' in this context anyway? It might be less confusing to just refer to the shapes and s values and omit all mention of symmetry?
The Sasmodels documentation further states:
and
Neither reference for Beaucage or Glatter are provided, although Beaucage's Unified model in Sasmodels is linked.
The Glatter reference is provided in Kline's documentation as: