SEARCH Articles Figures Tables Coupling constant measuring first-order spectra Determination of Spectra from Viscoelastic Functions Using First-Order Approximations Fast atom First-order spectra First derivative EPR spectrum First derivative spectra First optical spectrum First order spectra First-order approximation, relaxation spectra First-order spectra pseudo Fluorescence spectra first excited singlet state Measuring coupling constants from first-order spectra Multiplicity rules for first-order spectra Non-first-order spectra Nuclear magnetic resonance first-order spectra Spectra of first and higher order