Changes between Version 5 and Version 6 of KEMM37/Lab1B


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Timestamp:
Jan 25, 2018 5:53:41 AM (6 years ago)
Author:
ajj
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  • KEMM37/Lab1B

    v5 v6  
    4848|| 10.0 || 10hSDS_dChCldUrea_sub.txt || 
    4949 
    50  
    5150All 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. 
    5251 
     
    8786}}} 
    8887 
    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 
     90You will now load in the original reduced data for the 0.5 wt% concentration of SDS and subtract the solvent background from it. 
    9391 
    9492{{{ 
     
    9694[=#task13 **TASK 13:**] Click on the "Load Data" button in the Data Explorer 
    9795 
    98 Locate the folder where you placed the data, select all the files in that folder and click "Open" in the dialog. 
     96Locate 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 
     103From the "Tools" menu, select "Data Operation". 
     104 
     105}}} 
     106 
     107You should have a window that looks something like this: 
     108 
     109[[Image(kemm37_dataoperation.png)]] 
     110 
     111 
     112{{{ 
     113#!div style="background: lightblue" 
     114 
     115Give your output data set a name of your choosing in the "Output Data Name" box 
     116 
     117In the "Data 1" drop down, select the sample data set "0p5hSDS_dChCldUrea.txt". 
     118 
     119In the "Operator" drop down, choose "-" (minus) 
     120 
     121In the "Data 2" drop down, select the solvent data set "dChCldUrea.txt". 
     122 
     123Click "Apply", then "Close" 
     124 
     125In the data explorer, there should now be a data set with the name you chose above. 
     126 
     127Make 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 
     129Does 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 
     137You 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 
     143Before 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 
     150Locate the folder where you placed the data, select all the files in the "subtracted" folder and click "Open" in the dialog. 
    99151}}} 
    100152 
     
    106158{{{ 
    107159#!div style="background: lightblue" 
    108 [=#task14 **TASK 14:**] Plot the loaded data 
     160[=#task17 **TASK 17:**] Plot the loaded data 
    109161 
    110162Make sure that all the datasets have check marks next to them in the Available Data section of the Data Explorer, as shown above. 
     
    119171{{{ 
    120172#!div style="background: lightblue" 
    121 [=#task15 **TASK 15:**] Examining the Data. 
     173[=#task18 **TASK 18:**] Examining the Data. 
    122174 
    123175Visually inspect the data, zooming in and making additional plots as needed. 
     
    129181 
    130182 
    131 === [=#section34 3.4 Fitting the data] === 
    132 {{{ 
    133 #!div style="background: lightblue" 
    134 [=#task16 **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. 
    135187 
    136188Select 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. 
     
    148200{{{ 
    149201#!div style="background: lightblue" 
    150 [=#task17 **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. 
    151203 
    152204Repeat for other concentrations 
     
    159211{{{ 
    160212#!div style="background: lightblue" 
    161 [=#task18 **TASK 18:**] Summarising the results 
     213[=#task21 **TASK 21:**] Summarising the results 
    162214 
    163215Having fitted all the data sets you can now summarise the results and comment on the trends you observe.