| Parameter | Description | Example Std 1H experiment |
|---|---|---|
| tn | transmitter nucleus | 'H1' |
| sfrq | observe transmitter frequency | 399.952 MHz |
| tof | transmitter offset (center of spectral window) higher numbers set center of window to higher frequencies (downfield,higher ppm) tof=0 sets center of window to ~5ppm for 1H experiments | -426.0 Hz |
| tpwr | transmitter power (tpwr and pw determine how much signal is generated) | 55 (range of 0 to 63) |
| pw | pulse width | 27 usec |
| sw | sweep width | 4400 Hz |
| dw | dwell time, time between each data point (= 1/(2*sw)) | 113.6 usec |
| fb | filter bandwidth (=(1.25)(0.5)(sw)) | 2640 Hz |
| np | number of points, usually a power of 2 | 16384 |
| at | acquisition time | 1.862 sec |
| fn | number of pints to be fourier transformed (must be a power of 2, should be at least 2*np) | 32768 |
| dr | digital resolution (=sw/np) | 0.134 |
| pad | pre acquisition delay, the delay before the experiment starts | 0 |
| d1 | relaxation delay, delay between transients | 1 |
| p1,d2 | other pulses and delays not used in this expt | 0 |
| de | delay between pulse and acquistion (=rof2+alfa) | 30 usec |
| nt | number of transients (or scans) =4n, where n=1,2,3… signal/noise ratio is proportional to nt2 | 16 |
| bs | number of transients to collect before saving data | 16 |
| ss | steady state transients, pulses and delays are conducted but no data is collected during these transients | 2 |
| gain | receiver gain, amount by which detected signal should be amplified to be observed. If gain='n', spectrometer will automatically adjust gain to the best value. | 'n' |
Apodization (Weighting) Functions
| Name | Equation |
|---|---|
| lorentzian | exp(-t*pi*lb) |
| gaussian | exp(-((t-gfs)/gf)2) |
| sine bell | sin((t-sbs*pi/(2*sb)) where sb>0 |
| squared sine bell | sin((t-sbs*pi/(2*sb)) where sb<0 |
movetof sets tof to cursor value.
movesw sets sw and tof based upon cursor values.
pw(60,<90 degree pw>) sets pw to 60 degree pulse width.
ernst(<T1>,<90 degree pw>) sets pw to Ernst angle ("ideal" pulse angle) where T1 = average T1 relaxation time of molecule
time(<hours>,<minutes>), sets nt so that experiment takes <hours>:<minutes>
dps to display pulse sequence
pps to plot pulse sequence