Calculation of the electron-nucleus scalar-pseudoscalar interaction constant WS for YbF and BaF molecules:: A perturbative approach

The P,T-odd interaction constant, W-S, for the ground state of YbF and BaF molecules are calculated using the second-order many-body perturbation theory (MBPT) via Z-vector technique. The interaction constant W-S reported here agrees favorably well with other correlated calculations. We also address the convergence behavior of W-S with respect to the number of active orbitals used in the perturbative calculations.