T₁ Inversion-Recovery Experiment 3/25/94

1. Collect a one-pulse experiment. Optimize sw,

2. Type dot1(minT₁,maxT₁,time) where minT₁ and maxT₁ are estimates of the minimum and maximum T₁ relaxation times of your sample and time is the desired experiment time IN HOURS.

3. Set nt = multiple of 4, pw = 90° pulse width listed at spectrometer, p1 = 2*pw, bs = 8, vp=0.

4. Type da and examine the list of d2 values used in this experiment. To modify this list, type d2(first_number,second_number,third_number,...)

5. Type ga to start experiment.

Data analysis

1. Type wft ds(arraydim)

2. Adjust the phase, adjust vs to display all peaks

3. Click on main menu, display, interactive, next, thresh, and adjust the threshold (yellow horizontal line) by clicking the left mouse button, so that all interesting peaks are taller than the threshold.

4. type dll.

5. Click on main menu, display, interactive and type dscale. Set the vertical cursors around a peak and click on expand. Record the index number from the peak list in the text output window that matches a peak to be analyzed. Only the tallest peak of a multiplet needs to be analyzed. Repeat for all peaks to be analyzed. The expl routine (step 9) can only display the first six selected peaks.

6. Type fp(index_1,index_2,index_3,...) where index_# were recorded in step 5.

7. Type t1s to display a list of T1 times. Type t1 to display all data. Type printon t1s printoff to print the list of T₁ times.

8. To display all T₁ spectra, click on main menu, analyze, exponential, T1 Proc. These spectra CANNOT be interactively adjusted. To plot this display, click on main

menu, analyze, exponential, T1 Proc, plot.

9. To display a graph of the exponential curves, type expl. To display a log graph, type expl('log'). To display a graph of selected peaks, type expl(index_#,index_#,...). To change the vertical scale of the graph, start at step 6 and select the index numbers of only selected peaks. Type pexpl, pexpl('log'), or pexpl(index_#,...), and type page to plot the graph. The expl routine displays only the first six peaks. To generate the expl graph for additional peaks, return to step 6 and select index numbers only for these additional peaks.