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A partial-wave method is developed to deal with small molecules dominated bya central atom as an extension of earlier single-center methods. In particular,a model potential for the water molecule is expanded over a basis of sphericalharmonics. A finite element method is employed to generate local polynomialfunctions in subintervals over a finite range for the radial variable. Theangular parts of the system are represented by spherical harmonics. The problemof Stark resonances is treated with the exterior complex scaling method whichincorporates a wavefunction discontinuity at the scaling radius. The resultantnon-hermitian matrix eigenvalue problem yields resonance positions and widths(decay rates). We present these DC Stark shifts and exponential decay rates forthe valence orbitals $1b_1$, $3a_1$, and the bonding orbital $1b_2$.Furthermore, comparison is made with total molecular decay rates and DC shiftsobtained recently within the Hartree-Fock and coupled-cluster approaches.

Partial-wave approach to the Stark resonance problem of the water molecule