  An exterior complex scaling technique is applied to compute Stark resonance
parameters for two molecular orbitals ($1b_{1}$ and $1b_{2}$) represented in
the field-free limit in a single-center expansion. For electric DC field
configurations that guarantee azimuthal symmetry of the solution the
calculation is carried out by solving a two-dimensional partial differential
equation in spherical polar coordinates using a finite-element method. The
resonance positions and widths as a function of electric field strengths are
shown for field strengths starting in the tunnelling ionization regime, and
extending well into the over-barrier ionization region.
