Quantitative determination of the adiabatic condition using force-detected nuclear magnetic resonance

摘要

The adiabatic condition governing cyclic adiabatic inversion of proton spins in a micron-sized ammonium chloride crystal was studied using room temperature nuclear magnetic resonance force microscopy. A systematic degradation of signal to noise was observed as the adiabatic condition became violated. A theory of adiabatic following applicable to cyclic adiabatic inversion is reviewed and implemented to quantitatively determine an adiabaticity threshold (γH_1)~2/(ω_(osc)Ω)=6.0 from our experimental results.