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EPR transient nutation spectroscopy is used to measure the effective field(Rabi frequency) for multiphoton transitions in a two-level spin systembichromatically driven by a transverse microwave (MW) field and a longitudinalradio-frequency (RF) field. The behavior of the effective field amplitude isexamined in the case of a relatively strong MW field, when the derivation ofthe effective Hamiltonian cannot be reduced to first-order perturbation theoryin w_{1} / w_{rf} (w_{1} is the microwave Rabi frequency, w_{rf} is the RFfrequency). Experimental results are consistently interpreted by taking intoaccount the contributions of second and third order in w_{1} / w_{rf} evaluatedby Krylov-Bogolyubov-Mitropolsky averaging. In the case of inhomogeneouslybroadened EPR line, the third-order correction modifies the nutation frequency,while the second-order correction gives rise to a change in the nutationamplitude due to a Bloch-Siegert shift.

Multiphoton Transitions in a Spin System Driven by Strong Bichromatic Field