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bkg_gsas_f5 [2010/09/17 02:42]
pamwhitfield created
bkg_gsas_f5 [2020/07/16 11:29]
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-<code topas>'​GSAS background function 5 - GSAS manual page 130 
-'to model rise at low Q (air scatter) 
-'NOTE Topas currently will not plot the function on the difference plot 
-'P. Whitfield 
-macro Bkg_GSAS_f5(bk1,​ b1v, bk2, b2v, bk3, b3v, bk4, b4v, bk5, b5v, bk6, b6v, bk7, b7v, bk8, b8v) 
-{ 
-   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 Q = 4 Pi Sin(X Deg_on_2) / Lam; 
  
-   ​fit_obj = bk1 + bk2 /Q^2 + 2 bk3 /Q^4 + 6 bk4 /Q^6 + 24 bk5/Q^8 + 120 bk6/Q^10 + 720 bk7/Q^12 + 5040 bk8/Q^14; 
-}</​code>​ 

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