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abs_lobanov [2016/11/04 12:46]
pamwhitfield
abs_lobanov [2016/11/04 12:50]
pamwhitfield
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 Description:​ This is the absorption correction used in GSAS formatted for TOF neutron diffraction Description:​ This is the absorption correction used in GSAS formatted for TOF neutron diffraction
  
-Comment: Lobanov absorption macro with calculated lambda for wavelength dependence of mu (as per GSAS manual). The macro can be edited to function with CW data with '​Lam'​ replacing 'lamda' and '​Sin(Th)'​ replacing '​sintheta'​+Comment: Lobanov absorption macro with calculated lambda for wavelength dependence of mu (as per GSAS manual). The macro can be edited to function with CW data with '​Lam'​ replacing 'lambda' and '​Sin(Th)'​ replacing '​sintheta'​
  
 Contributed by: Pamela Whitfield Contributed by: Pamela Whitfield
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 Lf is the flightpath and two_theta the detector angle. The refinable parameter under each dataset is '​mu'​ Lf is the flightpath and two_theta the detector angle. The refinable parameter under each dataset is '​mu'​
  
-POWGEN flightpath is 60 metres focussed into a single dataset at 90 degrees. ​+POWGEN flightpath is 60 metres ​with data focussed into a single dataset at 90 degrees. ​
  
 Absorption is angle-dependent. For more conventional TOF instruments with multiple detector banks such as HRPD, two_theta (and maybe Lf) will differ for each bank by using '​local'​ variables as opposed to global '​prm'​ variables, e.g.  Absorption is angle-dependent. For more conventional TOF instruments with multiple detector banks such as HRPD, two_theta (and maybe Lf) will differ for each bank by using '​local'​ variables as opposed to global '​prm'​ variables, e.g. 

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