# Differences

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 dac_abs_correction [2014/04/25 08:06]martin_fisch created dac_abs_correction [2020/07/16 11:29] (current) 2014/04/25 08:16 martin_fisch 2014/04/25 08:13 martin_fisch 2014/04/25 08:12 martin_fisch 2014/04/25 08:06 martin_fisch created Next revision Previous revision 2014/04/25 08:16 martin_fisch 2014/04/25 08:13 martin_fisch 2014/04/25 08:12 martin_fisch 2014/04/25 08:06 martin_fisch created Line 1: Line 1: ====== DAC_Abs_Correction ====== ====== DAC_Abs_Correction ====== - Description: ​A + Description: ​Absorption correction for diamond anvil cell data. Corrects intensity decrease with increasing 2-Theta due to longer beam paths through diamonds. - Comment: ​by default topas puts limits on values ​of uij - it's often more useful ​to know if something goes npd + Comment: ​Actually not a macro, the structure ​of diamond in included with a scale factor of zero to calculate the correct value for u_per_cm_diamond for any given wavelength. - Contributed by: Alan Coelho + Contributed by: Martin Fisch - macro adp_no_limits + - { + scale_pks ​= Exp( - u_per_cm_diamond * ( 1 - 1/Cos(Deg * 2 * Th))); - move_to u11 min = Val - .05; max = Val + .05; + str - move_to u22 min = Val - .05; max = Val + .05; + phase_name "​Diamond"​ - move_to u33 min = Val - .05; max = Val + .05; + Cubic(3.56672) ​ - move_to u12 min = Val - .05; max = Val + .05; + scale 0 - move_to u13 min = Val - .05; max = Val + .05; + space_group "Fd-3mS" - move_to u23 min = Val - .05; max = Val + .05; + prm u_per_cm_diamond ​= (Get(phase_MAC) * 1.6605402 Get(cell_mass) / Get(cell_volume));: 0 - } + site C x 0 y 0 z 0 occ C 1 beq 1