Nuclear magnetic double resonance based on strong rf magnetic-field-induced coupling between spin systems

Abstract

The origin of the rf magnetic-field-induced coupling between spin systems is discussed. A new nuclear-double-resonance technique employing this coupling is proposed, which has particular value in measuring pure nuclear-quadrupole-resonance spectra of integer-spin nuclei by nuclear double resonance. The sensitivity of the new technique is discussed for the case of ${}_{}{}^1{}_{}{}^{}\mathrm{H}$-${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ double resonance in zero static magnetic field, as well as for the case of nuclear double resonance in a strong static magnetic field and the case of nuclear quadrupole double resonance. The technique is illustrated by ${}_{}{}^1{}_{}{}^{}\mathrm{H}$-${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ double resonance in thymine in zero static magnetic field and by ${}_{}{}^{19}{}_{}{}^{}\mathrm{F}$-${}_{}{}^{23}{}_{}{}^{}\mathrm{Na}$ double resonance in NaF, by ${}_{}{}^1{}_{}{}^{}\mathrm{H}$-${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ double resonance in N${\mathrm{H}}_4$ ${\mathrm{H}}_2$P${\mathrm{O}}_4$, and by ${}_{}{}^1{}_{}{}^{}\mathrm{H}$-${}_{}{}^{87}{}_{}{}^{}\mathrm{Rb}$ double resonance in Rb${\mathrm{H}}_2$P${\mathrm{O}}_4$ in a strong static magnetic field.