Enhancement of the electric dipole moment of the electron in the YbF molecule

A semiempirical calculation of the P-odd and P,T-odd interactions in the YbF molecule is made. As a result, the corresponding constants of the effective spin-rotational Hamiltonian of the molecule are obtained. In comparison with atoms, both P-odd and P,T-odd interactions are enhanced approximately ${10}^3$ times. For example, the electric dipole moment of the valence electron feels an internal molecular electric field of 3×${10}^{10}$ V/cm. This field is directed along the molecular axis and can be oriented by an external field ∼${10}^4$ V/cm.