Information in a NMR Spectra
1) Energy  E = hu
h is Planck constant
u is NMR resonance frequency
  10-10 10-8       10-6    10-4         10-2       100        102
                              wavelength (cm)
 g-rays    x-rays   UV VIS   IR      m-wave   radio
Observable       Name               Quantitative Information
Peak position Chemical shifts (d)           d(ppm) = uobs –uref/uref  (Hz)                        chemical (electronic) 
                                                                                                                                                environment of nucleus
Peak Splitting                Coupling Constant (J) Hz              peak separation                               neighboring nuclei
                                                                                             (intensity ratios)                                (torsion angles)
Peak Intensity                Integral                                          unitless (ratio)                                  nuclear count (ratio)
                                                                                   relative height of integral curve T1 dependent
Peak Shape                   Line width                                 Du = 1/pT2                     molecular motion
         peak half-height chemical exchange
uncertainty principal
uncertainty in energy