The effect of adiabatic double-resonance excitation on the indirect in a reference frame spanned by the single-transition Cartesian spin-spin coupling spectra of a liquid-like spin system is discussed. operators (5, 6) been recognized (7).
It is shown in detail how adiabatic excitation affects the coherence-
The effect of a space-dependent Hamiltonian on the evolutransfer process from one spin species to another (restricted to the tion of a liquid-like heteronuclear spin system can be evalucase of two spin-1 2 nuclei), when the indirect Hamiltonian cannot be ated by focusing on a small volume in which the RF field disregarded with respect to that of adiabatic excitation. The approach can be considered nearly constant. Dealing with a liquidis based on the formalism of the ''single-transition Cartesian operalike spin system, in fact, the local Hamiltonians H(r, t) tors.'' The result shows that the in-phase and the antiphase coherare almost uncoupled and the spin evolution can be studied ences of the J spectra are modified and new spin-order terms can through a term of the summation H(t) Γ
Ν r H(r, t), where be generated. Furthermore, more widespread conditions of adiabat-H(t) is an operator in Liouville space (8) and r is the vector icity are given, together with the suggestion of new excitation pathwhich localizes the spatial volume, which should be, on one ways.