Changes between Version 5 and Version 6 of KEMM37/Lab1B
- Timestamp:
- Jan 25, 2018 5:53:41 AM (6 years ago)
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KEMM37/Lab1B
v5 v6 48 48 || 10.0 || 10hSDS_dChCldUrea_sub.txt || 49 49 50 51 50 All the data files have been processed to 1D scattering curves with the solvent background subtracted to leave only the coherent scattering signal on absolute scale. 52 51 … … 87 86 }}} 88 87 89 90 === [=#section33 3.3 Loading and Plotting the data] === 91 92 You will now load the data into !SasView and make a plot in order to visually inspect the scattering curves. 88 === [=#section33 3.5 Loading data and Subtracting a Solvent Background] === 89 90 You will now load in the original reduced data for the 0.5 wt% concentration of SDS and subtract the solvent background from it. 93 91 94 92 {{{ … … 96 94 [=#task13 **TASK 13:**] Click on the "Load Data" button in the Data Explorer 97 95 98 Locate the folder where you placed the data, select all the files in that folder and click "Open" in the dialog. 96 Locate the folder where you placed the data, select all the files in the "Not subtracted" folder and click "Open" in the dialog. 97 }}} 98 99 {{{ 100 #!div style="background: lightblue" 101 [=#task14 **TASK 14:**] Subtract the solvent background using the "Data Operation" Tool 102 103 From the "Tools" menu, select "Data Operation". 104 105 }}} 106 107 You should have a window that looks something like this: 108 109 [[Image(kemm37_dataoperation.png)]] 110 111 112 {{{ 113 #!div style="background: lightblue" 114 115 Give your output data set a name of your choosing in the "Output Data Name" box 116 117 In the "Data 1" drop down, select the sample data set "0p5hSDS_dChCldUrea.txt". 118 119 In the "Operator" drop down, choose "-" (minus) 120 121 In the "Data 2" drop down, select the solvent data set "dChCldUrea.txt". 122 123 Click "Apply", then "Close" 124 125 In the data explorer, there should now be a data set with the name you chose above. 126 127 Make a plot of the original data sets and your subtracted one to compare them and check you did the subtraction correctly. Make sure that there are check marks next to "0p5hSDS_dChCldUrea.txt", "dChCldUrea.txt", and the dataset with the name you chose. Click on "New Plot" at the bottom of the Data Explorer. 128 129 Does the result look reasonable? What effects have subtracting the solvent scattering from the sample scattering had on the scattering curve? What are possible sources of the background signal that you are removing? 130 131 }}} 132 133 134 135 === [=#section34 3.4 Loading and Plotting the subtracted data] === 136 137 You will now load the background subtracted data into !SasView and make a plot in order to visually inspect the scattering curves. 138 139 {{{ 140 #!div style="background: lightblue" 141 [=#task15 **TASK 15:**] Restart !SasView 142 143 Before starting this part of the exercise, you should have a clean !SasView instance. Quit !SasView and restart it. 144 }}} 145 146 {{{ 147 #!div style="background: lightblue" 148 [=#task16 **TASK 16:**] Click on the "Load Data" button in the Data Explorer 149 150 Locate the folder where you placed the data, select all the files in the "subtracted" folder and click "Open" in the dialog. 99 151 }}} 100 152 … … 106 158 {{{ 107 159 #!div style="background: lightblue" 108 [=#task1 4 **TASK 14:**] Plot the loaded data160 [=#task17 **TASK 17:**] Plot the loaded data 109 161 110 162 Make sure that all the datasets have check marks next to them in the Available Data section of the Data Explorer, as shown above. … … 119 171 {{{ 120 172 #!div style="background: lightblue" 121 [=#task1 5 **TASK 15:**] Examining the Data.173 [=#task18 **TASK 18:**] Examining the Data. 122 174 123 175 Visually inspect the data, zooming in and making additional plots as needed. … … 129 181 130 182 131 === [=#section3 4 3.4Fitting the data] ===132 {{{ 133 #!div style="background: lightblue" 134 [=#task1 6 **TASK 16:**] Fitting the lowest concentration data.183 === [=#section35 3.5 Fitting the data] === 184 {{{ 185 #!div style="background: lightblue" 186 [=#task19 **TASK 19:**] Fitting the lowest concentration data. 135 187 136 188 Select the lowest concentration data only in the data explorer by ensuring only 0p2hSDS_dChCldUrea_sub.txt has a check mark next to it and click “Send to" fitting. … … 148 200 {{{ 149 201 #!div style="background: lightblue" 150 [=#task 17 **TASK 17:**] Fitting the other data, starting with the 7.5 wt% data set.202 [=#task20 **TASK 20:**] Fitting the other data, starting with the 7.5 wt% data set. 151 203 152 204 Repeat for other concentrations … … 159 211 {{{ 160 212 #!div style="background: lightblue" 161 [=#task 18 **TASK 18:**] Summarising the results213 [=#task21 **TASK 21:**] Summarising the results 162 214 163 215 Having fitted all the data sets you can now summarise the results and comment on the trends you observe.