# Differences

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 bkg_gsas_f6 [2010/09/17 02:45]pamwhitfield created bkg_gsas_f6 [2020/07/16 11:29] Line 1: Line 1: - '​GSAS background function 6 - GSAS manual page 130 - 'to model rise at low Q (air scatter) and high Q (thermal diffuse scattering) - 'NOTE Topas will not currently plot this function on the difference plot - 'P. Whitfield - macro Bkg_GSAS_f6(bk1,​ b1v, bk2, b2v, bk3, b3v, bk4, b4v, bk5, b5v, bk6, b6v, bk7, b7v, bk8, b8v, bk9, b9v, bk10, b10v, bk11, b11v, bk12, b12v, bk13, b13v, bk14, b14v, bk15, b15v) - { - prm bk1 b1v  ​ - prm bk2 b2v - prm bk3 b3v  ​ - prm bk4 b4v - prm bk5 b5v  ​ - prm bk6 b6v - prm bk7 b7v  ​ - prm bk8 b8v - prm bk9 b9v - prm bk10 b10v - prm bk11 b11v - prm bk12 b12v - prm bk13 b13v - prm bk14 b14v - prm bk15 b15v - prm Q = 4 Pi Sin(X Deg_on_2) / Lam; - ​fit_obj = bk1 + (bk2 Q^2 + bk3/Q^2) + - (bk4 Q^4/2 + 2 bk5/Q^4) + - (bk6 Q^6/6 + 6 bk7/Q^6) + - (bk8 Q^8/24 + 24 bk9/Q^8)+ - (bk10 Q^10/120 + 120 bk11/Q^10) + - (bk12 Q^12/720 + 720 bk13/Q^12) + - (bk14 Q^14/5040 + 5040 bk15/Q^14) - ; - }