Coherent superposition of dressed spin states and pulse dressed electron spin resonance

Coherent superpositions of spin eigenstates in a strong near-resonant electromagnetic field can be prepared by pulses of a secondary linearly polarized electromagnetic field, which is parallel to the static magnetic field. Transient nutations on the dressed state transition and dressed state coherence echoes are observed in a two-level system. A two-dimensional correlation experiment for dressed state transitions is introduced. It is shown that the electron Zeeman frequency can be determined with higher precision in a dressed spin resonance experiment than in a conventional electron spin resonance experiment.