QUANTUM THEORY OF ATOMIC AND MOLECULARSCATTERING BASED ON THE FULLY UNCOUPLEDSPACE-FIXED REPRESENTATION

摘要

We describe a quantum theory of atomic and molecular collisions in the pres-ence of external electromagnetic fields based on the fully uncoupled space-fixed basis representation of the scattering wave functions. The fully uncoupled basis leads to simple expressions for the matrix elements of the Hamiltonian provid-ing all operators of fine and hyperfine interactions as well as the operators describing interatomic and intermolecular interactions are represented as di-rect products of spherical tensors defined in the laboratory-fixed coordinate system. We present a general expression for the electrostatic interaction operator of two atoms in arbitrary electronic states in terms of uncoupled products of space-fixed spherical tensors and describe recent studies of molecular collisions in external fields.