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The multiphoton transitions in the presence of additional strong nonresonant radiation

Two-photon transitions between the perturbed 6s<sup>2</sup> <sup>1</sup>S<sub>0</sub> ground state and the perturbed 5d7s<sup>3</sup>D<sub>2</sub> state of a Ba atom have been experimentally investigated with different perturbing and exciting radiations. A strong dependence of the probability of two-photon transitions between these perturbed states on the mutual orientation of the electric vectors of the exciting and perturbing radiations has been found.