Since the first attempts to calculate the helium ground state in the early days of Bohr-
Sommerfeld quantization, two-electron atoms have posed a series of unexpected …

Using theoretical results from complex rotation calculations and data from experimental
photoionization cross sections, the quantum defects, the widths, the oscillator strengths and …

Abstract Preface; 1. Introduction; 2. Single electron-electron transition probabilities; 3.
Formulation of multi-electron transition probabilities; 4. Independent electron approximation; …

We propose a novel approach for Hamiltonians allowing adiabatic separation of variables.
Our method is based on the assumption of smoothness of the motion associated with the …

The Siegert states have long been recognized as a potentially powerful tool in the formal
scattering theory. Here we propose an efficient method to implement this power in practice …

The instanton theory is reformulated with use of the path integral approach and the Wentzel–
Kramers–Brillouin approximation to the Schrödinger equation. Both approaches are shown …

The weak-field asymptotic theory of tunneling ionization in an external static uniform electric
field [Tolstikhin et al., Phys. Rev. A 84, 053423 (2011) PLRAAN 1050-2947 …

We consider non-relativistic systems in quantum mechanics interacting through the
Coulomb potential, and discuss the existence of bound states which are stable against …

We revisit the HD+ molecular ion by starting from a definition of the nonrelativistic adiabatic
Hamiltonian that recovers the isotopic splitting. The Hamiltonian is written in prolate …

In a study of systems with many degrees of freedom, such as those consisting of several
interacting particles, one usually seeks to follow the same methodological route, namely, a …