Phasing of 2D spectra

For 2D data which need no phase correction the PHmod parameter in FI, available in the General parameter setup dialog box opened via the Process pull-down menu, must be set to me if a magnitude, or to ps if a power spectrum should be calculated. Use the Help tool for more informations. 

Repeat these steps but perform a stepwise 2D FT using the xf2 command first and then the xfl command. Inspect the spectrum appearing on screen in between the two calculations. 

For 2D spectra to be displayed in phased mode, choose the Manual phase correction option from the Process pull-down menu of 2D WIN-NMR. This will also change the info field of the button panel and disable some of the panel buttons (Fig. 5.7). 

To phase either the columns or rows, click on the appropriate button in the button panel. A cross-hair cursor appears in the display field, and the Chi button is highlighted indicating that the trace for the first channel is to be selected. The spectrum display area is internally divided into three parts, corresponding to three different channels (columns or rows) that can be chosen to perform the phase correction. Select appropriate columns or rows from the 2D matrix by moving the cursor to the desired position and clicking 

The chosen trace can differ in appearance from the initially displayed one since the selections proceed on the basis of a reduced data set while the confirmed traces are derived from the full data set. If the confirmed trace is not suitable use the Prev.Trace and Next Trace buttons to select an appropriate trace. 

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