1 | #pragma rtGlobals=1 // Use modern global access method. |
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2 | #pragma IgorVersion = 6.0 |
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3 | |
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4 | //////////////////////////////////////////////////// |
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5 | // |
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6 | // calculates the scattering of a dumbbell, two spheres in contact, possibly |
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7 | // with overlap (a di-colloid). The length of the cylinder is zero, but is |
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8 | // programmed as 0.01 A to avoid numerical errors (I'm too lazy to go through |
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9 | // the math to find the proper limits) |
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10 | // |
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11 | // |
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12 | // a double integral is used, both using Gaussian quadrature |
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13 | // routines that are now included with GaussUtils |
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14 | // |
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15 | // 76 point quadrature is necessary for both quadrature calls. |
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16 | // |
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17 | // |
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18 | // REFERENCE: |
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19 | // H. Kaya, J. Appl. Cryst. (2004) 37, 223-230. |
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20 | // H. Kaya and N-R deSouza, J. Appl. Cryst. (2004) 37, 508-509. (addenda and errata) |
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21 | // |
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22 | //////////////////////////////////////////////////// |
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23 | |
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24 | //this macro sets up all the necessary parameters and waves that are |
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25 | //needed to calculate the model function. |
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26 | // |
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27 | Proc PlotDumbbell(num,qmin,qmax) |
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28 | Variable num=100, qmin=.001, qmax=.7 |
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29 | Prompt num "Enter number of data points for model: " |
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30 | Prompt qmin "Enter minimum q-value (^1) for model: " |
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31 | Prompt qmax "Enter maximum q-value (^1) for model: " |
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32 | // |
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33 | Make/O/D/n=(num) xwave_Dumb, ywave_Dumb |
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34 | xwave_Dumb = alog(log(qmin) + x*((log(qmax)-log(qmin))/num)) |
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35 | Make/O/D coef_Dumb = {1,20,40,1e-6,6.3e-6,0} //CH#2 |
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36 | make/o/t parameters_Dumb = {"Scale Factor","cylinder radius rc (A)","end cap radius R >= rc (A)","SLD cylinder (A^-2)","SLD solvent (A^-2)","Incoherent Bgd (cm-1)"} //CH#3 |
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37 | Edit parameters_Dumb, coef_Dumb |
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38 | |
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39 | Variable/G root:g_Dumb |
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40 | g_Dumb := Dumbbell(coef_Dumb, ywave_Dumb, xwave_Dumb) |
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41 | Display ywave_Dumb vs xwave_Dumb |
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42 | ModifyGraph marker=29, msize=2, mode=4 |
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43 | ModifyGraph log=1 |
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44 | Label bottom "q (A\\S-1\\M)" |
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45 | Label left "I(q) (cm\\S-1\\M)" |
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46 | AutoPositionWindow/M=1/R=$(WinName(0,1)) $WinName(0,2) |
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47 | |
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48 | AddModelToStrings("Dumbbell","coef_Dumb","parameters_Dumb","Dumb") |
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49 | // |
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50 | End |
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51 | |
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52 | |
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53 | // - sets up a dependency to a wrapper, not the actual SmearedModelFunction |
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54 | Proc PlotSmearedDumbbell(str) |
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55 | String str |
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56 | Prompt str,"Pick the data folder containing the resolution you want",popup,getAList(4) |
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57 | |
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58 | // if any of the resolution waves are missing => abort |
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59 | if(ResolutionWavesMissingDF(str)) //updated to NOT use global strings (in GaussUtils) |
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60 | Abort |
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61 | endif |
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62 | |
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63 | SetDataFolder $("root:"+str) |
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64 | |
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65 | // Setup parameter table for model function |
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66 | Make/O/D smear_coef_Dumb = {1,20,40,1e-6,6.3e-6,0} //CH#4 |
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67 | make/o/t smear_parameters_Dumb = {"Scale Factor","cylinder radius rc (A)","end cap radius R >= rc (A)","SLD cylinder (A^-2)","SLD solvent (A^-2)","Incoherent Bgd (cm-1)"} |
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68 | Edit smear_parameters_Dumb,smear_coef_Dumb //display parameters in a table |
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69 | |
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70 | // output smeared intensity wave, dimensions are identical to experimental QSIG values |
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71 | // make extra copy of experimental q-values for easy plotting |
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72 | Duplicate/O $(str+"_q") smeared_Dumb,smeared_qvals // |
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73 | SetScale d,0,0,"1/cm",smeared_Dumb // |
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74 | |
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75 | Variable/G gs_Dumb=0 |
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76 | gs_Dumb := fSmearedDumbbell(smear_coef_Dumb,smeared_Dumb,smeared_qvals) //this wrapper fills the STRUCT |
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77 | |
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78 | Display smeared_Dumb vs smeared_qvals // |
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79 | ModifyGraph log=1,marker=29,msize=2,mode=4 |
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80 | Label bottom "q (A\\S-1\\M)" |
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81 | Label left "I(q) (cm\\S-1\\M)" |
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82 | AutoPositionWindow/M=1/R=$(WinName(0,1)) $WinName(0,2) |
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83 | |
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84 | SetDataFolder root: |
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85 | AddModelToStrings("SmearedDumbbell","smear_coef_Dumb","smear_parameters_Dumb","Dumb") |
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86 | End |
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87 | |
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88 | |
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89 | |
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90 | //AAO version, uses XOP if available |
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91 | // simply calls the original single point calculation with |
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92 | // a wave assignment (this will behave nicely if given point ranges) |
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93 | Function Dumbbell(cw,yw,xw) : FitFunc |
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94 | Wave cw,yw,xw |
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95 | |
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96 | #if exists("DumbbellX") |
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97 | yw = DumbbellX(cw,xw) |
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98 | #else |
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99 | yw = fDumbbell(cw,xw) |
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100 | #endif |
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101 | return(0) |
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102 | End |
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103 | |
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104 | // |
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105 | // - a double integral - choose points wisely - 76 for both... |
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106 | // |
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107 | Function fDumbbell(w,x) : FitFunc |
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108 | Wave w |
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109 | Variable x |
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110 | // Input (fitting) variables are: |
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111 | //[0] scale factor |
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112 | //[1] cylinder radius (little r) |
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113 | //[2] cylinder length (big L) |
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114 | //[3] end cap radius (big R) |
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115 | //[4] sld cylinder (A^-2) |
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116 | //[5] sld solvent |
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117 | //[6] incoherent background (cm^-1) |
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118 | // give them nice names |
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119 | Variable scale,contr,bkg,inten,sldc,slds |
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120 | Variable len,rad,hDist,endRad |
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121 | scale = w[0] |
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122 | rad = w[1] |
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123 | // len = w[2] |
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124 | endRad = w[2] |
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125 | sldc = w[3] |
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126 | slds = w[4] |
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127 | bkg = w[5] |
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128 | |
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129 | hDist = sqrt(endRad^2-rad^2) |
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130 | |
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131 | Make/O/D/N=7 Dumb_tmp |
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132 | Dumb_tmp[0] = w[0] |
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133 | Dumb_tmp[1] = w[1] |
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134 | Dumb_tmp[2] = 0.01 //length is some small number, essentially zero |
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135 | Dumb_tmp[3] = w[2] |
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136 | Dumb_tmp[4] = w[3] |
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137 | Dumb_tmp[5] = w[4] |
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138 | Dumb_tmp[6] = w[5] |
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139 | |
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140 | |
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141 | contr = sldc-slds |
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142 | |
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143 | Variable/G root:gDumTheta=0,root:gDumT=0 |
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144 | |
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145 | inten = IntegrateFn76(Dumb_Outer,0,pi/2,Dumb_tmp,x) |
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146 | |
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147 | inten /= 2*pi*(2*endRad^3/3+endRad^2*hDist-hDist^3/3) //divide by volume |
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148 | inten *= 1e8 //convert to cm^-1 |
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149 | inten *= contr*contr |
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150 | inten *= scale |
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151 | inten += bkg |
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152 | |
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153 | Return (inten) |
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154 | End |
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155 | |
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156 | // outer integral |
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157 | // x is the q-value |
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158 | Function Dumb_Outer(w,x,dum) |
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159 | Wave w |
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160 | Variable x,dum |
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161 | |
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162 | Variable retVal |
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163 | Variable scale,contr,bkg,inten,sldc,slds |
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164 | Variable len,rad,hDist,endRad |
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165 | scale = w[0] |
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166 | rad = w[1] |
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167 | len = w[2] |
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168 | endRad = w[3] |
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169 | sldc = w[4] |
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170 | slds = w[5] |
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171 | bkg = w[6] |
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172 | |
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173 | hDist = sqrt(endRad^2-rad^2) |
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174 | |
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175 | NVAR dTheta = root:gDumTheta |
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176 | NVAR dt = root:gDumT |
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177 | dTheta = dum |
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178 | retval = IntegrateFn76(Dumb_Inner,-hDist/endRad,1,w,x) |
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179 | |
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180 | Variable arg1,arg2 |
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181 | arg1 = x*len/2*cos(dum) |
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182 | arg2 = x*rad*sin(dum) |
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183 | |
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184 | retVal += pi*rad*rad*len*sinc(arg1)*2*Besselj(1, arg2)/arg2 |
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185 | |
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186 | retVal *= retval*sin(dum) // = |A(q)|^2*sin(theta) |
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187 | |
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188 | return(retVal) |
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189 | End |
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190 | |
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191 | //returns the value of the integrand of the inner integral |
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192 | Function Dumb_Inner(w,x,dum) |
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193 | Wave w |
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194 | Variable x,dum |
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195 | |
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196 | Variable retVal |
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197 | Variable scale,contr,bkg,inten,sldc,slds |
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198 | Variable len,rad,hDist,endRad |
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199 | scale = w[0] |
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200 | rad = w[1] |
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201 | len = w[2] |
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202 | endRad = w[3] |
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203 | sldc = w[4] |
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204 | slds = w[5] |
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205 | bkg = w[6] |
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206 | // hDist = sqrt(endRad^2-rad^2) |
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207 | |
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208 | NVAR dTheta = root:gDumTheta |
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209 | NVAR dt = root:gDumT |
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210 | dt = dum |
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211 | |
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212 | retVal = Dumb(w,x,dt,dTheta) |
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213 | |
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214 | retVal *= 4*pi*endRad^3 |
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215 | |
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216 | return(retVal) |
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217 | End |
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218 | |
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219 | Function Dumb(w,x,tt,Theta) |
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220 | Wave w |
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221 | Variable x,tt,Theta |
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222 | |
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223 | Variable val,arg1,arg2 |
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224 | Variable scale,contr,bkg,inten,sldc,slds |
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225 | Variable len,rad,hDist,endRad |
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226 | scale = w[0] |
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227 | rad = w[1] |
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228 | len = w[2] |
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229 | endRad = w[3] |
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230 | sldc = w[4] |
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231 | slds = w[5] |
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232 | bkg = w[6] |
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233 | |
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234 | hDist = sqrt(endRad^2-rad^2) |
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235 | |
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236 | arg1 = x*cos(theta)*(endRad*tt+hDist+len/2) |
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237 | arg2 = x*endRad*sin(theta)*sqrt(1-tt*tt) |
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238 | |
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239 | val = cos(arg1)*(1-tt*tt)*Besselj(1,arg2)/arg2 |
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240 | |
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241 | return(val) |
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242 | end |
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243 | |
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244 | //wrapper to calculate the smeared model as an AAO-Struct |
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245 | // fills the struct and calls the ususal function with the STRUCT parameter |
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246 | // |
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247 | // used only for the dependency, not for fitting |
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248 | // |
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249 | Function fSmearedDumbbell(coefW,yW,xW) |
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250 | Wave coefW,yW,xW |
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251 | |
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252 | String str = getWavesDataFolder(yW,0) |
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253 | String DF="root:"+str+":" |
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254 | |
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255 | WAVE resW = $(DF+str+"_res") |
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256 | |
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257 | STRUCT ResSmearAAOStruct fs |
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258 | WAVE fs.coefW = coefW |
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259 | WAVE fs.yW = yW |
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260 | WAVE fs.xW = xW |
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261 | WAVE fs.resW = resW |
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262 | |
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263 | Variable err |
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264 | err = SmearedDumbbell(fs) |
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265 | |
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266 | return (0) |
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267 | End |
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268 | |
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269 | // this is all there is to the smeared calculation! |
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270 | // |
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271 | // 20 points should be fine here. This function is not much different than cylinders, where 20 is sufficient |
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272 | Function SmearedDumbbell(s) :FitFunc |
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273 | Struct ResSmearAAOStruct &s |
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274 | |
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275 | // the name of your unsmeared model (AAO) is the first argument |
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276 | Smear_Model_20(Dumbbell,s.coefW,s.xW,s.yW,s.resW) |
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277 | |
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278 | return(0) |
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279 | End |
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