LIFETIMES OF ELECTRONICALLY METASTABLE DOUBLE-RYDBERG ANIONS - FH2-

The method of analytic continuation of real stabilization graphs was applied to calculate positions and widths of electronic resonances of the FH2- double-Rydberg anion at the experimental geometry of the parent FH2+ cation. In correlated calculations on FH2-, a full configuration interaction calculation was performed on the two outermost electrons; the remaining electrons occupied orbitals taken from the SCF-level treatment of the FH2+ core. All spatial symmetries and both singlet and triplet spin multiplicities were considered. Many Feshbach and core-excited shape resonances were found with lifetimes in the range (1 to 80) X 10-14 s. Different methods of fitting the coefficients of the characteristic polynomial used in the stabilization calculations were considered. Techniques to suppress incomplete basis set artifacts in the stabilization calculations were examined. © 1990 American Institute of Physics.