A Sturmian theory of three-body recombination is presented which provides a unified treatment of bound states, quasibound states, and continuum states. The Sturmian representation provides a numerical quadrature of the two-body continuum which may be used to generate a complete set of states within any desired three-body recombination pathway. Consequently, the dynamical calculation may be conveniently formulated using the simplest energy transfer mechanism, even for reactive systems which allow substantial rearrangement. The Sturmian theory generalizes the quantum kinetic theory of Snider and Lowry to include metastable states which are formed as independent species. Steady-state rate constants are expressed in terms of a pathway-independent part plus a nonequilibrium correction which depends on tunneling lifetimes and pressure. Numerical results are presented for H2 recombination due to collisions with H and He using quantum-mechanical coupled states and infinite-order sudden approximations. These results may be used to remove some of the uncertainties that have limited astrophysical simulations of primordial star formation.
|Original language||English (US)|
|Journal||Physical Review A - Atomic, Molecular, and Optical Physics|
|State||Published - Nov 25 2013|
All Science Journal Classification (ASJC) codes
- Atomic and Molecular Physics, and Optics