  Calculations of Stark interference between $E1$ and $M1$ transition
amplitudes on the $H^3\Delta_1$ to $C^1\Pi$ transition in ThO is performed.
Calculations are required for estimations of systematic errors in the
experiment for electron electric dipole (eEDM) moment search due to
imperfections in laser beams used to prepare the molecule and read out the
(eEDM) signal.

Atomic Physics