The quantum mechanical three-body problem is studied for general short-range interactions.
We work in coordinate space to facilitate accurate computations of weakly bound and …

Developments in the application of hyperspherical coordinates in a unified treatment of
bound states and resonances of two-electron atomic systems and other general Coulomb …

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 …

We calculate and analyse S-wave resonances of helium up to an energy of-0.02 au applying
the complex rotation technique. Rydberg series converging to the hydrogenic thresholds of …

The ability to calculate electron-atom/ion scattering is of both fundamental and practical
interest to physicists. For the simplest target of atomic hydrogen, the eH scattering problem is …

Doubly excited states in helium are calculated with many-body perturbation theory to all
orders in the electron-electron interaction. A finite and numerical basis set, rotated out into …

Hyperspherical harmonics are extremely useful in nuclear physics and reactive scattering
theory. However, their use has been confined to specialists with very strong backgrounds in …

The negative ion of hydrogen continues to be important in atomic physics and astrophysics.
Correlations between the two electrons are strong already in the ground state, the only …

The photodetachment cross sections for H− and Li− in the vicinity of the H (n= 2-4) and Li
(n= 3-4) thresholds are calculated. A discrete numerical basis set, combined with the method …

We study the existence of stable bound states of triatomic molecules containing two helium
atoms and one alkali atom X (X= Li, Na) and examine the dependence of their binding …