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We show that the emission of a gamma-ray photon by a nucleus can beinfluenced by a microwave magnetic field acting on the atomic electrons. Westudy theoretically these electron-nuclear double transitions (ENDTs) for^{151}Eu nuclei in a CaF_2 lattice at low temperature, in the presence of astatic magnetic field and of a microwave magnetic field. The ENDTs acquire asignificant intensity for certain resonance frequencies. The ENDTs are ofinterest for the identification of the position of the lines in complexM\"{o}ssbauer spectra.Comment: 8 pages; 3 Postscript figures: Fig. 1, Fig. 2(a), Fig. 2(b

Emission of gamma rays shifted from resonant absorption by electron-nuclear double transitions in 151 Eu 2+ :CaF 2

Emission of gamma rays shifted from resonant absorption by electron-nuclear double transitions in ¹⁵¹ Eu ²⁺ :CaF ₂