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T1 Inversion-Recovery Program
for RadioProcessor and iSpin-NMR
OverviewThe T1 Inversion-Recovery (T1IR) experiment applies a 180 degree inverting pulse, waits a period of tau, then applies a 90 degree pulse to cause an FID response from the sample. It then repeats this pulse sequence with increasing durations of tau. The relationships of the FID response peaks can be modeled with an exponential fit to determine T1, the Spin-Lattice relaxation time.
The length of the T1IR experiment can make it easy for the magnet and sample to drift off resonance during experimentation and skew results. To prevent this, the T1IR program has the ability to use a Single-Pulse NMR scan to automatically find and set the resonance frequency before each iterative Inversion Recovery scan. This auto-resonance feature will increase run time, but prevent any off-resonance drifting.
The T1IR program is available for download at the bottom of this page, as well as with the other NMR programs in the RadioProcessor section of the SpinAPI Example Downloads.
Figure1. T1IR Manual Range Results (16 tau steps, tau range: 0.1ms - 300ms, a sample of household cooking oil using a 10.8MHz permanent magnet)
Figure 1 shows the resultant FID peak response when manually ranging tau. Figure 2, below, shows the pulse sequence used by the RadioProcessor to perform this experiment. Each vertical line is a new instruction, and the names of the durations used are shown above each time range.
Figure2. T1IR Pulse Sequence
Running the T1IR ProgramThe T1IR program accepts command line parameters
to specify the values for
each of the pulse program's parameters. It takes the following arguments as inputs:
Table1. T1IR Input Arguments
These arguments must all be passed as input parameters when launching the T1IR.exe file. Omitting or passing arguments out of order will cause the program to return an error. To simplify this process, a T1IR.bat file is provided. This file allows for easy manipulation of argument values, and ensures that they will passed in the correct order. To use the T1IR.bat file simply:
Viewing T1IR ResultsAfter execution of the T1IR program, the output files can be used with external programs to visualize the data. The T1IR program wills
The LabVIEW NMR Interface can process .txt files. To do this:
The Felix NMR program can process .fid files. To do this simply ensure that the Felix NMR program is installed properly and double-click on the .fid file.
Gnuplot can process .gp files. To do this:
T1IR Acquisition Tips
Setting the input parameters correctly is critical in obtaining good T1IR data. Below are suggestions for determining these parameters:
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