Analysis of Relaxation Data
The data must be saved as a NUTS 2D file. Data which consists of a series of 1D files can be converted to a 2D file using the following Link, provided the 1D file names have sequential file extensions (e.g., file.001, file.002, etc):
- GA SC IN
You will be prompted for the first 1D file and for a name for the newly created 2D file. When the Link finishes, read in the 2D file.
Note that this feature is not included in NUTS Lite.
The T1 data has been saved as a 2D data set, shown here using a stacked plot display.
Be sure each slice is phased correctly and has a flat baseline.
Select the peak whose T1 is to be calculated, and use Zoom to expand so that only the peak is displayed with just a small amount of baseline on each side.
It will make the numbers easier to read if the last slice in the data set has its integral set to a convenient number, such as 100.
Exit the Iintegration and Zoom routines, leaving the expanded region displayed.
Choose Get Relaxation Data from the Tools menu (or type GR). This causes NUTS to read in each slice in turn and measure its integral for the expanded region. The display does not change when this operation is performed.
Choose Data Reduction from the Tools menu (or type DR). This enters the relaxation subroutine and displays a curve of area vs. time. The green curve does not represent a fit, just a quick first estimate.
To perform a Simplex fit, choose Optimize from the Fit menu (or type O).
See section on relaxation for equations and other options.
The fit has been performed.
To create a table of time vs. area, choose Data to Clipboard from the Edit menu (or type T). This list can be displayed on the screen by choosing Show Clipboard from the Edit menu (or type S or Ctrl-B).
Return to section on Relaxation
Last updated: 11/3/97.