The idea of integrated cross polarization which has been utilized for electron-to-nucleus polarization transfer is applied to nucleus-to-nucleus polarization transfer. Instead of using a pi/2 pulse followed by a pi/2 phase-shifted locking pulse like in the conventional cross polarization, irradiation with a single phase is applied together with adiabatic frequency sweep frorn far off-resonance toward on-resonance. This is capable of locking individual spin packets even in the presence of considerable spectral distribution and/or line broadening. Thus, this technique can provide efficient polarization transfer for spin species having large chemical shifts and experiments in high static fields. (c) 2005 Elsevier B.V. All rights reserved.