DOUBLE PHOTOEXCITATION OF P-1(0) STATES IN HELIUM

For P(o) states of helium we formulate a Schrodinger equation in perim etric coordinates. in which the rotational coupling is already pre-dia gonalized. Expansions in near-complete basis sets and complex scaling techniques allows the determination of highly accurate ab initio param eters for doubly excited resonant states and photo cross sections. The results are in excellent agreement with recent high-quality experimen tal data.