Non perturbative approach for a polar and polarizable linear molecule in an inhomogeneous electric field: Application to molecular beam deviation experiments

A non perturbative approach is used to solve the problem of a rigid linear molecule with both a permanent dipole moment and a static dipole polarizabi lity in a static electric field. Eigenenergies are obtained and compared to perturbative lo low field and high field approximations. Analytical expres sions for the orientation parameters and for the gradient of the energy are given. This non perturbative approach is applied to the simulation of beam deviation experiments in strong electric field. Results of simulations are given for inhomogeneous alkali dimers. For LiNa, the simulations are compa red to experimental data. For Lift, deviation profiles have been simulated in order to prepare future experiments on this molecule.