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--- m [2009/08/27 11:16] – clare
+++ m [2025/09/19 15:18] (current) – created - external edit 127.0.0.1
@@ Line 1: / Line 1: @@
+====== m ======
+**[//marquardt_constant// !E]…**
+Allows for changing the Marquardt constants, the Simulated_Annealing_1 macro changes the Marquardt constants as follows:
+load marquardt_constant { 0 1 }
+**[//min_r// #] [//max_r// #]**
+Defines the minimum and maximum radii for calculating bond lengths. //min_r// and //max_r// are by default set to 0 and 3.2 Å respectively.
+**[//mixture_density_g_on_cm3// !E]**
+Calculates the density of the mixture assuming a packing density of 1, see also //[[#k038|mixture_MAC]]////.//
+**[//mixture_MAC// !E]**
+Calculates the mass absorption coefficient in cm<sup>2</sup>/g for a mixture as follows:
+<sub>{{techref_files:image160.gif?160x45}}</sub>where //w//<sub>i</sub> and (//m/////r//)<sub>i</sub> is the weight percent and //phase_MAC// of phase i respectively. Errors are reported for //phase_MAC// and //mixture_MAC//.
+The following example provides phase and mixture mass absorption coefficients.
+xdd...
+mixture_MAC 0
+str...
+phase_MAC 0
+The macros Mixture_LAC_1_on_cm, Phase_LAC_1_on_cm and Phase_Density_g_on_cm3 calculates the mixture and phase linear absorption coefficients (for a packing density of 1) and phase density, for example:
+xdd...
+Mixture_LAC_1_on_cm(0)
+str...
+Phase_Density_g_on_cm3(0)
+Phase_LAC_1_on_cm(0)
+Errors for these quantities are also calculated. Mass absorption coefficients obtained from NIST at [[http://physics.nist.gov/PhysRefData/XrayMassCoef|http://physics.nist.gov/]][[http://physics.nist.gov/PhysRefData/XrayMassCoef|P]][[http://physics.nist.gov/PhysRefData/XrayMassCoef|hysRefData/XrayMassCoef]] are used to calculate //mixture_MAC// and //phase_MAC//.