Home > Scripts > Models > Specialized > sf_square_well.m

iFit/sf_square_well

PURPOSE ^

y = sf_square_well(p, x, [y]) : structure factor of particles interacting with a square well potential [Sharma]

SYNOPSIS ^

function y=sf_square_well(varargin)

DESCRIPTION ^

 y = sf_square_well(p, x, [y]) : structure factor of particles interacting with a square well potential [Sharma]

   iFunc/sf_square_well structure factor of particles interacting with a 
       square well potential [Sharma]
     The 'x' wave-vector/momentum axis is usually in nm-1 or Angs-1.
     Typical values for parameters are 
       R=10 Angs, rho=0.02, epsilon=1.5*T, Delta=1.2*RHS
     The model returns the S(q) structure factor.

     Ref: Sharma, R. V.; Sharma, K. C. Physica, 89A, 213. (1977).
          Extracted from sasfit/sasfit_sq/sasfit_sq_SquareWell2.c
     I. Bressler, et al, Journal of Applied Crystallography, 2015, 48 (5), 1587-1598

 input:  p: square well potential model parameters (double)
            p = [ R=Hard_Sphere_Radius rho=Volume_Fraction epsilon=Well_Depth_K Delta=WellWidth T=Temperature_K]
          or 'guess'
         x: wave-vector/momentum axis (double, e.g. nm-1 or Angs-1)
         y: when values are given and p='guess', a guess of the parameters is performed (double)
 output: y: model value (intensity S(q))
 ex:     y=sf_square_well([50 0.05 15 10 10], -10:10); or plot(sf_square_well,[10 0.02 15 10 10], 0:0.01:1)

 Version: Mar. 22, 2017
 See also iFunc, iFunc/fits, iFunc/plot
 (c) E.Farhi, ILL. License: EUPL.

CROSS-REFERENCE INFORMATION ^

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