Coherent NMR Stark spectroscopy

► E-field pulses at 2ω0 synched with line narrowing isolates quadrupolar Stark effect. ► The phase of the 2ω0 field in the NMR frame selects tensorial response components. ► Coherent averaging enhances resolution 103-fold, for resolvable QSE response. ► Spectral analysis and numerical simulations evaluate non-AHT characteristics. ► Relative tensorial factors defined by ϕE, individual quantitation vs |E| evaluated..