Tools for Assigning Resonance Structures in Collisions of Few-Body Quantum Systems

The complex dilated Mittag-Leffler, the T-matrix, and the Siegert pseudostate methods are briefly reviewed. Their respective strengths and weaknesses and some recent results are discussed. Permanent address: V. Fock Institute of Physics, St. Petersburg State University, St. Petersburg, 198504 Russia Permanent address: Department of Mathematical and Computational Physics, St. Petersburg State University, St. Petersburg, Russia Permanent address: Department of Physics, University of South Africa, P.O. Box 392, Pretoria, South Africa