  It is proposed to use the photoelectric effect in the inner shells of the
229Th atoms to refine the energy of the 8.3-eV isomer. The calculation was
performed using the Feinberg-Migdal shaking theory, which leads to the
probability of isomer formation up to several units of 10^-4 in the case of the
K shell. As a result, two lines are predicted in the photoelectron spectrum,
their separation energy providing the energy of the isomer. Other ways of using
the method to study the properties of the isomer are also discussed: through
shaking during the formation of radioactive beams in storage rings, etc.
Moreover, recording the effect in an experiment will provide the isomer's
partial lifetime.
