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Basic experimental parameters

one pulse graphic
nameparameter functionshort description
zgpulse program A set of instructions to the spectrometer telling it when to wait, when to pulse, and when to acquire. The zg experiment is the single pulse-acquire routine shown above.
d1first delay The spectrometer will wait d1 seconds.
p1pulse duration The radio-frequency (rf)-pulse time in microseconds. For a square pulse, it is inversely proportional to the bandwidth of excitation.
pl1pulse power level The attenuation applied to the amplifier's output.
dedead time The time the spectrometer waits between the end of the final pulse and the start of detection.
It allows for probe ring-down to end before beginning data collection.
aqacquisition The total time that digitization of the "free induction decay" (FID) takes place.
aq = dw * td = td / (2swh)
tdtime domain points The number of points used to digitize the FID.
dwdwell time The time interval between the sampled points (td) of the FID.
dw = 1 / (2swh)
swspectral width The frequency range of the acquired spectrum in ppm. If the units are in Hz, the parameter is swh.
swh=1/(2*dw)
nsnumber of shots The number of repetitions of the experiment. The more FID's added together, the higher the signal-to-noise ratio.
dsdummy shots The number of time that the full experiment is repeated, but the FID is not stored. It is used to establish an equilibrium between pulses and delays before storing data.
o1poffset The center frequency of the RF pulse (the carrier frequency) translated into ppm (the center of the spectrum after Fourier transform). The same value in absolute units (MHz) is called sfo1. Or in Hz, relative to TMS, is called o1.