Electron localization of in a dc electric field
Jia Z M1, Zeng Z N1, †, Tang W T2, Li R X1
       

The 2-dimensional model for molecular ion in the calculation, where R is the relative internuclear distance, and θ is the cross angle between the polarization axis of the dc electric field and the molecular axis. The electronic axes z and x are parallel and perpendicular to the molecular axis, respectively.