|Title||QUANTUM THEORY OF ATOMIC AND MOLECULAR SCATTERING BASED ON THE FULLY UNCOUPLED SPACE-FIXED REPRESENTATION|
|Publication Type||Conference Paper|
|Year of Publication||2010|
|Editor||Babb, JF, Kirby, K, Sadeghpour, H|
|Conference Name||PROCEEDINGS OF THE DALGARNO CELEBRATORY SYMPOSIUM: CONTRIBUTIONS TO ATOMIC, MOLECULAR, AND OPTICAL PHYSICS, ASTROPHYSICS, AND ATMOSPHERIC PHYSICS|
|Publisher||Inst Theoret Atom, Mol & Opt Phys|
We describe a quantum theory of atomic and molecular collisions in the presence 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 providing all operators of fine and hyperfine interactions as well as the operators describing interatomic and intermolecular interactions are represented as direct 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.