Multichannel atomic spectra frequently exhibit such extraordinary visual complexity that they
appear at first glance to be uninterpretable. The present review discusses how to unravel …

With the exception of the harmonic oscillator, quantum wave packets usually spread as time
evolves. This is due to the non-linear character of the classical equations of motion which …

In this book we summarize the essential results of our efforts over the years to calculate
energies, wave functions, and electromagnetic transitions of atoms as functions of the …

We describe extensive results on the 1 P o double-excitation resonances of He below the
N= 2–9 ionization thresholds obtained recently by high-resolution photoionization …

Over billions of years, evolutionary pressure has facilitated the development of sophisticated
and diverse light-harvesting systems in photosynthetic organisms, enabling them to adapt to …

What is the behavior of a low-dimensional quantal system whose classical, deterministic,
Hamiltonian, counterpart is non-integrable and undergoes a transition to chaos? After a …

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 …

We report the existence of exceptional points for the hydrogen atom in crossed magnetic
and electric fields in numerical calculations. The resonances of the system are investigated …

Using the complex coordinate method, it is possible to compute the physical properties of
atomic resonances above the ionization threshold. We show how to define and compute the …

In this, the first of two papers, we obtain a simple analytic formula for the photodetachment
cross section of H− in crossed electric and magnetic fields. The three-dimensional …