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 …

Perturbed two-body problems play a special role in Celestial Mechanics as they capture the
dominant dynamics for a broad range of natural and artificial satellites. In this paper, we …

Interplanetary space travel has played an important role in the development of our
knowledge of the solar system. For decades, probes have been sent in various destinations …

Zero-electron-kinetic-energy photoelectron spectroscopy ''ZEKE-PES''is based on the pulsed
field ionization of long lived Rydberg states ZEKE states; it is generally accepted that ZEKE …

We show that operators capable of converting certain spherical hydrogen atom
eigenfunctions into others by raising the angular momentum quantum number ℓ can be …

We present a classical, relativistic Monte Carlo calculation investigating the role of the
magnetic field in bound-state dynamics and ionization for atoms in ultrastrong external …

We investigate the dynamics of a two-degree-of-freedom mechanical system for energies
slightly above a critical value. The critical set of the potential function is assumed to contain a …

The response of a hydrogen atom to a perturbative electric field is presented from a classical
viewpoint. We find classical energy shifts in the hydrogen atom in situations that correspond …

The hydrogen atom in weak external fields is a very accurate model for the multiphoton
excitation of ultrastable high angular momentum Rydberg states, a process which classical …

The complex processes leading to the collisional population of ultra-long-lived Rydberg
states with very high angular momentum can be explained surprisingly well using classical …