The first two terms represent the Zeeman and microwave Hamiltonians of the electron spin in the rotating frame, where ω #$ -ω % is the electron resonance offset term and ω1S the electron Rabi frequency. The next term is the nuclear Zeeman interaction, where ω0I is the nuclear Larmor frequency. Finally, the last term is the part of the dipolar interaction between the electron and nuclear spin, where I± = Ix ± iIy. As in the description of nuclear orientation via electron spin locking (NOVEL) and the integrated solid effect (ISE) we neglect the SzAzzIz term in the dipolar interaction .