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It is proposed to use the photoelectric effect in the inner shells of the229Th atoms to refine the energy of the 8.3-eV isomer. The calculation wasperformed using the Feinberg-Migdal shaking theory, which leads to theprobability of isomer formation up to several units of 10^-4 in the case of theK shell. As a result, two lines are predicted in the photoelectron spectrum,their separation energy providing the energy of the isomer. Other ways of usingthe method to study the properties of the isomer are also discussed: throughshaking during the formation of radioactive beams in storage rings, etc.Moreover, recording the effect in an experiment will provide the isomer'spartial lifetime.

Measurement of the energy of the 8.3-eV isomer of 229mTh with photoelectric effect