Windows Overlays Window <Prev Next>

Experimental Overlays

This is a typical display shown when an experimental overlay is chosen from the tree view in the overlay window.  For more information, click on the picture below:

Explanation of the parameters and settings in this window are given here.

Load overlay file. Note that the upper button loads a single overlay file, clearing the current overlay. The lower button adds to the current overlay.
Save all overlays
Save all overlays to a different file. Note that the upper button saves all overlays, the lower just the current one.
Copy current overlay to clipboard
Add another overlay from the clipboard
Fix all parameters, i.e. set Float = "no" for all parameters.
Cycle through units (cm-1, nm, MHz, Kelvin and eV), converting parameter values as appropriate each time. For overlays this is not normally required, as the the position units will be converted automatically to those selected for the main plot. Note also that in the overlays window the convert operation is applied to the currently selected object, not the entire tree of objects.
Add overlay from file. Note that the upper button loads a single overlay file, clearing the current overlay.
Export current overlay to file. Note that the upper button saves all overlays, the lower just the current one.
Copy peaks to clipboard
Delete peaks from this overlay
PlotOperateButton Perform various operations on the spectrum; many of these can also be performed by right clicking on the overlay on the main window, if it is plotted separately from other traces.
Invert Multiply the intensity at each point by -1. Note that versions before 10.1.108 used Imax + Imin - I.
Crop Discard points outside selected range, as specified as FirstPoint to LastPoint. These can be set to the current visible region by right clicking on the overlay in the main window and selecting "Select Visible".
Find Zero Uses a heuristic to attempt to set baseline to the probable zero level of the spectrum.
Scale Prompts for a vertical scale factor to apply to the entire spectrum. This is needed only when contour if the order of magnitude of the data is very different from the calculated data, resulting in a Scale variable very different from one. The Baseline and Scale variables will need adjusting after scaling.
Join To... Add selected spectrum to the current spectrum; if done from the main window the join point is at the mouse position, otherwise any overlap region is divided equally between the two spectra.
Join All,Unscaled Join all spectra of this type together, ignoring the vertical scaling
Join All,Scaled Join all spectra of this type together, using the vertical scaling
Smooth... Smooth (and differentiate if required) the spectrum. The method used is Savitzky-Golay smoothing as originally described in A Savitzky and MJE Golay, Anal Chem, 36, 1627 (1964).
Compress... Compress the spectrum by either:
  • averaging every n points together
  • averaging all points within a specified interval, to give points on a regular grid. (This can expand the spectrum if the interval is less than the starting interval.)
A dialog box allows the choice to be made.
Discard Frequency Replace frequency with point number
Discard Intensity Set Intensity to 1, and convert to linelist
Separate Produce two independent intensity channels from frequency and intensity
Swap x and y Swap frequency and intensity channels

 This allows an overlay to be selected from the overlays currently loaded.  Overlays can also be selected using the tree view in the overlays window.
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