Calculate reflectivity data
All SLD's are input as the SLD*106.
You can upload a reflectivity datafile with two columns to the applet. The first column should be Q in A-1 and the second column should be normalized reflectivity. The data will be plotted on the graph along with the calculated model. The columns should be delimited with any number of spaces (not tabs) between the columns.
The format for the various layers in the model are:Real SLD*106 Imaginary SLD*106 Layer Thickness(Angstroms)so each layer should have three values in it separated by spaces.
The layers go in order from the fronting medium to the backing medium, and the entire stack of layers can be repeated by changing the number of cells to a number higher than 1.
I will put SLD's for various reference substrate materials as well as a link to the SLD calculator. Silicon is one common substrate material, and it has a scattering length density of 2.08e-6. If you want to make a stack of layers on top of a silicon substrate you would put 2.08e-6 in the field for Backing, Real SLD and define your model in the text area below it.
If you click in the plot area the following commands are available:
- r: redraw the plot
- R: redraw the plot and rescale it to the maximum range of the data
- c: bring up a small window that displays the current cursor position (Note: Some browsers do not correctly transfer the cursor focus back to the plot and away from the cursor position window. If this is the case you will need to click on the plot again for more commands to work.)
- d: draw a dot on the plot at the nearest data point to the mouse position and show the coordinates of the point in a small window. (Note: See note for c)
- D: close the data position window
- h: if pressed in the small windows brought up with c or d this will close that window
- m: brings up a dialog for setting the range of the plot manually
- drag mouse: click and drag on the plot to define a rectangular area to define new plot ranges. R will set the range back to the default.
Note: Some browsers will cause the applet to function improperly if you leave this page and come back to it. If you find that this is the case you can open this page in a new browser window and use the original one for browsing.
Report errors or make inquiries to Alan Munter, <email@example.com>
Last modified 22-March-2004 by website owner: NCNR (attn: Alan Munter)