TEMPORARY ANIONS - CALCULATION OF ENERGY AND LIFETIME BY ABSORBING POTENTIALS - THE N-2(-)(2)PI(G) RESONANCE

The calculation of energies and lifetimes of metastable molecules requ ires the treatment of both the continuum and correlation effects. We d escribe the complex absorbing potential approach incorporated within a configuration-interaction framework. The absorbing potential method a llows a very efficient solution of the continuum problem, making possi ble a detailed study of the correlation effects that turn out to be su rprisingly strong. The famous N-2(-) (2)Pi(g) resonance is studied as a test case and much attention is paid to an internally balanced treat ment of the metastable state. Our findings are rationalized within a s imple model that is then used to understand the results of various pre vious studies.