Physics – Condensed Matter – Materials Science
Scientific paper
2007-12-12
JETP, Vol. 105, No. 5, pp. 893-899 (2007) [Zh. Eksp. Teor. Fiz., Vol. 132, No. 5, pp. 1026-1033 (2007)]
Physics
Condensed Matter
Materials Science
7 pages, 6 figures
Scientific paper
10.1134/S1063776107110039
EPR transient nutation spectroscopy is used to measure the effective field (Rabi frequency) for multiphoton transitions in a two-level spin system bichromatically driven by a transverse microwave (MW) field and a longitudinal radio-frequency (RF) field. The behavior of the effective field amplitude is examined in the case of a relatively strong MW field, when the derivation of the effective Hamiltonian cannot be reduced to first-order perturbation theory in w_{1} / w_{rf} (w_{1} is the microwave Rabi frequency, w_{rf} is the RF frequency). Experimental results are consistently interpreted by taking into account the contributions of second and third order in w_{1} / w_{rf} evaluated by Krylov-Bogolyubov-Mitropolsky averaging. In the case of inhomogeneously broadened EPR line, the third-order correction modifies the nutation frequency, while the second-order correction gives rise to a change in the nutation amplitude due to a Bloch-Siegert shift.
Fedoruk G. G.
Markevich S. A.
Saiko A. P.
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