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AIP conference proceedings

Application of coherent Rydberg states for collision studies

Erik Horsdal-Pedersen, J. C. Day, Brett D DePaola, Thomas Ehrenreich, S. B. Hansen, Y. Leontiev, Keith B. MacAdam, K. S. Mogensen

Published Jan 1, 1996• 0 citations
Publisher

Abstract

The cross section for charge transfer in fast collisions between Rydberg atoms in coherent elliptic states of n=25 and singly charged ions has been measured as a function of the eccentricity and the orientation of the initial state. Dramatic variations are seen. Theoretical results based on classical collision dynamics are in good qualitative agreement with the experimental data for initial conditions leading to relatively large cross sections. Quantal close‐coupling results scaled from n=4 to n=25 are in better overall agreement with experiment.

DOI
10.1063/1.49778

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The cross section for charge transfer in fast collisions between Rydberg atoms in coherent elliptic states of n=25 and singly charged ions has been measured as a function of the eccentricity and the orientation of the initial state. Dramatic variations are seen. Theoretical results based on classical collision dynamics are in good qualitative agreement with the experimental data for initial conditions leading to relatively large cross sections. Quantal close‐coupling results scaled from n=4 to n=25 are in better overall agreement with experiment.
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The absolute cross section for the energy transfer between the nP Rydberg atom (n=35--60) and the ground-state (5S) atom of rubidium is measured to be 4.8\ifmmode\times\else\texttimes\fi{}102{10}^{2}102 A˚2{\r{}}^{2}˚2 for thermal collisions at 420 K. This value of the cross section is in agreement with the calculated value for resonant charge transfer at the relevant collision energy. It is concluded that the energy transfer process is essentially charge transfer between the Rydberg ion core and the ground-state atom, where the Rydberg electron stays as a spectator.
Charge transfer from high‐n atomic targets populates comparably excited states of ionic projectiles. This paper reviews a decade of accelerating experimental and theoretical progress in the field, which offers an unusual variety of challenges in the preparation of initial states and in the analysis of final states. Interesting dynamical questions at the interface of classical and quantum mechanics are posed by new experimental results. Rydberg atom phenomena are increasingly found to be important for other areas of atomic collision physics in all energy regimes.
Theoretical electron transfer cross sections for 1.3--130 eV/amu singly charged ions colliding with Rydberg atoms (n=28, m=2) in a magnetic field up to 4 T are presented. Both paramagnetic and diamagnetic interactions are taken into account for the initial state and the collision. Cross sections are calculated within the classical trajectory Monte Carlo model. A method to create a classical ensemble of electrons in a nonseparable Hamiltonian allows the initial quantum stationary states to be modeled. The effect of the magnetic field on electron capture is analyzed in terms of the field-induced alteration of the initial state, as well as the direct influence on the collision dynamics.
Low-energy collisions of Rydberg atom-ion systems are investigated theoretically. We present the parameter space associated with suitable approaches for the dynamics of Rydberg atom-ion collisions, i.e., quantum, Langevin, and classical exchange regimes, showing that for the lowest reachable temperatures a classical treatment is appropriate. A quasiclassical trajectory method is used to study charge exchange cross sections for ${\mathrm{Li}}^{*}\text{\ensuremath{-}}{\mathrm{Li}}^{+}$ and ${\mathrm{Li}}^{*}\text{\ensuremath{-}}{\mathrm{Cs}}^{+}$ at collision energies down to 1K1\phantom{\rule{0.28em}{0ex}}\mathrm{K}1K. For cold collisions we find the charge exchange cross section deviating from the n4{n}^{4}n4 geometric scaling. Furthermore, for low-energy collisions, we find both an influence of the ionic core repulsion as well as variations for two different models used for describing the electron-core potential.