Theory of line narrowing by double-frequency irradiation in NQR

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Abstract
It is shown that the standard time‐dependent perturbation theory is inadequate to treat the problem of line narrowing by double‐frequency irradiation in NQR. We show here that a semiclassical treatment which avoids the secular terms provides results in agreement with the radiation field quantization method, which is here extended for the first time to NQR problems. As an application, we consider a hypothetical 14N NQR double irradiation experiment and we determine the conditions which lead to line narrowing.