MODEL RELEASED: NMR spectrometry. A scientist at the controls of a Nuclear Magnetic Resonance (NMR) spectrometer. This measures the resonance between an applied oscillating magnetic field and the magnetic moment of atoms. The display seen here is a '2D' trace. This is a plot of excitation frequency on one axis, resonance frequency on the second axis and response intensity in the vertical axis. This type of plot is used to identify the consituents of a compound and to give some data relating to its structure.