Using the Window View (WV) command
This subroutine allows experimentation with window functions while simultaneously viewing the apodization function, the FID and the resulting spectrum. The spectrum can be expanded with zoom so that the effects on lineshape can be more easily seen.
This subroutine is not included in NUTS Lite.
Start by processing the data with no apodization, FT and phase.
Before entering the WV subroutine, this has been expanded to view the region of interest.
Type WV to enter the subroutine.
The grey line at the top is the apodization function.
The green trace is the entire FID, even when the spectrum is expanded. This allows adjustment of the apodization to match the shape of the FID.
Most Nuts commands are active while in the WV subroutine, allowing the user to set parameter values such as linebroadening (LB), gaussian factor (GF) and phase for sine function (S#).
No changes are made until the chosen window function is applied. (EM, LG, TF, MS or TM)
Here, LB was set to 1 and EM executed.
The grey line shows the shape of the resulting function. The FID does not change.
The spectrum has changed to reflect application of 1 Hz linebroadening.
This operation can be undone by typing Ctrl-Z, causing the apodization function and spectrum to be reset so that a different function can be applied.
Here, LB was set to -1, GF was set to 0.1 and LG was executed (Lorentz-Gauss resolution enhancement).
Exiting the routine with <ENTER> applies the current window function and displays the resulting spectrum.
Exiting the routine with <ESCAPE> aborts the operation, and reverts to the spectrum that was displayed before the WV routine was entered.
WV can be especially useful when optimizing window functions for 2D data. See example.
Last updated: 11/6/01.