Waterfall patterns
Often you need to compare your base pattern with other diffraction patterns. For example, you want to compare how diffraction patterns have changed before and after heating. You may also want to compare the diffraction patterns obtained for narrow azimuthal angle range.
Peakpo can plot your base patterns together with other diffraction patterns. The functions are available in the Waterfall tab.
Press the + push button in the Selected box of the Waterfall tab. The pop-up window will allow you to choose chi files for waterfall.
I strongly recommend you to place chi files to waterfall in the same directory as the base pattern, if possible. This is particularly important if you want to share your analysis in the dpp and ppss files with others.
Other buttons in the Selected box allow you to make changes in the list shown in the excel style box in the Waterfall tab. You can remove, move up, and move down a diffraction file in the list. To make these actions, you first have to highlight the row you want to make changes.
The excel style list allow you to change the colors of individual waterfall patterns and their X-ray energies. The checkboxes in the list allow you to show/unshow individual diffraction patterns in the list.
The [X] (check) and [ ] (uncheck) in the All items box allow you to select and deselect all the waterfall files in the excel style list in once, respectively.
By pressing the Clear push button, you may erase the current waterfall list.
The horizontal slider in the View box of the Waterfall tab changes the size of the gap between the patters in the waterfall plot.
Sometime it is useful to swap one of your patterns in waterfall with base pattern. This is particularly useful if you want to quickly check the cake image of a waterfall pattern. You should first highlight the waterfall pattern to make base pattern and press the Set as a base ptn push button. This will swap the highlighted waterfall and your base pattern.
When you make waterfall from diffraction patterns measured with different X-ray energies, it is handy if you can convert the two theta of the diffraction patterns to the same energy. This can be achieved by checking the Convert to base pattern wavelength check box in the View box.
Some diffraction patterns may have very different intensity scales. In this case, it is helpful to normalize the intensity, so that the different diffraction patterns in the waterfall can be scaled comparably. This can be achieved by checking the Intensity normalization check box.