Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Physical Review A

Theory of collisional quenching of fast metastable ions

Joel I. Gersten

Published Mar 1, 1977• 8 citations
Publisher

Abstract

A perturbation theoretic calculation of the quenching of fast metastable ions by collision with rare-gas atoms is developed. The quenching is caused by transitions resulting from the interaction with the electrostatic potential of the target atom. A comparison with experimental data is given.
DOI
10.1103/physreva.15.940

Related papers

Quenching of metastable He+ 2s ions by molecules

Govind P. Gupta, K. C. Mathur

A time-dependent perturbation theory is used to obtain the cross sections and rates for the quenching of metastable helium ions in collision with molecules (${\mathrm{H}}_{2}$, ${\mathrm{N}}_{2}$, ${\mathrm{O}}_{2}$, and C${\mathrm{O}}_{2}$). The results are compared with the recent experimental data of Prior and Wang.

Physical Review A•May 1, 1981•3 citations

Collisional quenching of antiprotonic helium atoms in gaseous helium

Boyan Obreshkov, D. Bakalov, Bruno Lepetit +1 more

The cross sections and rates for quenching of thermalized antiprotonic helium atoms in binary collisions with ordinary helium atoms are calculated in perturbation theory and in the coupled-channel formalism at the temperature and the number density of the helium gas, $T=6\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ and $N={10}^{21}\phantom{\rule{0.3em}{0ex}}{\text{cm}}^{\ensuremath{-}3}$, respectively. It is shown that quenching is unlikely to be relevant for the metastable states of the antiprotonic helium atom with $32\ensuremath{\leqslant}n\ensuremath{\leqslant}40$. Comparison with experiment shows a good quantitative agreement for the $(n,l)=(39,35)$ state of antiprotonic helium and a large disagreement for the $(37,34)$ state. As a byproduct of this work, the existence of a series of bound states of the $\mathrm{He}--\overline{p}\phantom{\rule{0.2em}{0ex}}^{4}\mathrm{He}^{+}$ dimer is demonstrated numerically for $n\ensuremath{\geqslant}38$.

Physical Review A•Apr 1, 2004•17 citations

Theoretical model for the collision of high Rydberg atoms with neutral atoms or molecules

E. de Prunelé, J. Pascale

A theoretical model for the collision of atoms in high Rydberg states (nl) with neutral atoms or molecules is proposed, based on the assumption that the electron-perturber interaction is of very short range compared with the mean radius of the Rydberg atom. A semiclassical method is used to derive a compact expression for the collision probability. The calculations need total cross sections for the scattering of a free and low-energy electron by the perturber. The model is applied to the calculation of a free and low-energy electron by the perturber. The model is applied to the calculation of cross sections for the quenching of n 2 D or n 2 F Rydberg states of Na and Rb by rare-gas atoms of N 2 . On the whole the calculated cross sections are in reasonable agreement with experimental data for n>10 approximately. The model and the results of the calculations are discussed and compared with other theoretical works.

Journal of Physics B Atomic and Molecular Physics•Aug 14, 1979•77 citations

Group IIA Metastable Collision Complexes: Spectroscopy and Behavior in Intense Radiation Fields.

J. Cooper, J. Coutts

Abstract : This report describes work addressing the problems of collisional induced oscillator strength and energy transfer from metastable states in Group IIA alkaline earth metal atoms. The quenching of CA 3PJ states when perturbed by rare was atom collisions is investigated and such quenching is found to be negligable. The CA 1D2 state, however shows considerable collisional induced effects. Calculations have been performed which show that collision cross-sections for transfer of electronic excitation may be switched from the low values typically associated with off-resonant processes to the high values associated with resonant processes by using a strong laser to bring dressed states in one atom in and out of resonance with bare states in another atom. Keywords: Slow atomic collisions; Chemical lasers.

•Sep 18, 1987•0 citations

Inelastic and quasielastic collisions of Rydberg atoms with the heavy rare-gas atoms

Владимир Сергеевич Лебедев, I. I. Fabrikant

A theory of inelastic n,l-changing and quasielastic l-mixing collisions of Rydberg atoms with the heavy rare-gas atoms is developed. It is based on the semiclassical impact-parameter approach combined with the normalized perturbation theory. Semiclassical formulas for scaled transition probabilities and cross sections as functions of the inelasticity parameter and the collision strength are analyzed. This approach gives a general description of collisional nl\ensuremath{\rightarrow}${\mathit{n}}^{\ensuremath{'}}$ transitions independently of the specific values of the principal quantum number, the relative velocity, and the type of colliding atoms. The energy and angular dependence of the electron-atom scattering amplitude is included in the theory by incorporating the impulse-approximation results in the weak-coupling limit. The Ramsauer-Townsend effect affects significantly the values of the cross sections, especially for the inelastic transitions with large energy transfer. The results obtained are used in calculations of the quenching cross sections for the Rb(nS,nD,nF) atoms in collisions with Ar, Kr, and Xe. Comparison of theory and experiment is made in a wide range of the principal quantum numbers and transition energy defects. \textcopyright{} 1996 The American Physical Society.

Physical Review A•Oct 1, 1996•26 citations

On the quenching mechanisms of Rydberg states of atoms during collisions with alkaline-earth atoms

E. S. Mironchuk, Alexander A. Narits

Collisional quenching of Rydberg states of Na(nl) atoms during the interaction with Sr (5s 2) and Ca (4s 2) atoms is theoretically studied. The effects of two quenching mechanisms are considered: the resonant one associated with transitions between ionic and covalent terms of a quasi-molecule formed during collisions and the non-resonant mechanism caused by quasi-free electron scattering by a perturbing atom. The ranges of the prevalence of these mechanisms are determined depending on the principal and orbital quantum numbers, as well as the electron affinities of the alkaline-earth atom.

Bulletin of the Lebedev Physics Institute•Mar 1, 2015•0 citations
A time-dependent perturbation theory is used to obtain the cross sections and rates for the quenching of metastable helium ions in collision with molecules (H2{\mathrm{H}}_{2}H2​, N2{\mathrm{N}}_{2}N2​, O2{\mathrm{O}}_{2}O2​, and CO2{\mathrm{O}}_{2}O2​). The results are compared with the recent experimental data of Prior and Wang.
The cross sections and rates for quenching of thermalized antiprotonic helium atoms in binary collisions with ordinary helium atoms are calculated in perturbation theory and in the coupled-channel formalism at the temperature and the number density of the helium gas, T=6KT=6\phantom{\rule{0.3em}{0ex}}\mathrm{K}T=6K and $N={10}^{21}\phantom{\rule{0.3em}{0ex}}{\text{cm}}^{\ensuremath{-}3}$, respectively. It is shown that quenching is unlikely to be relevant for the metastable states of the antiprotonic helium atom with $32\ensuremath{\leqslant}n\ensuremath{\leqslant}40$. Comparison with experiment shows a good quantitative agreement for the (n,l)=(39,35)(n,l)=(39,35)(n,l)=(39,35) state of antiprotonic helium and a large disagreement for the (37,34)(37,34)(37,34) state. As a byproduct of this work, the existence of a series of bound states of the He−−p‾4He+\mathrm{He}--\overline{p}\phantom{\rule{0.2em}{0ex}}^{4}\mathrm{He}^{+}He−−p​4He+ dimer is demonstrated numerically for $n\ensuremath{\geqslant}38$.
A theoretical model for the collision of atoms in high Rydberg states (nl) with neutral atoms or molecules is proposed, based on the assumption that the electron-perturber interaction is of very short range compared with the mean radius of the Rydberg atom. A semiclassical method is used to derive a compact expression for the collision probability. The calculations need total cross sections for the scattering of a free and low-energy electron by the perturber. The model is applied to the calculation of a free and low-energy electron by the perturber. The model is applied to the calculation of cross sections for the quenching of n 2 D or n 2 F Rydberg states of Na and Rb by rare-gas atoms of N 2 . On the whole the calculated cross sections are in reasonable agreement with experimental data for n>10 approximately. The model and the results of the calculations are discussed and compared with other theoretical works.
Abstract : This report describes work addressing the problems of collisional induced oscillator strength and energy transfer from metastable states in Group IIA alkaline earth metal atoms. The quenching of CA 3PJ states when perturbed by rare was atom collisions is investigated and such quenching is found to be negligable. The CA 1D2 state, however shows considerable collisional induced effects. Calculations have been performed which show that collision cross-sections for transfer of electronic excitation may be switched from the low values typically associated with off-resonant processes to the high values associated with resonant processes by using a strong laser to bring dressed states in one atom in and out of resonance with bare states in another atom. Keywords: Slow atomic collisions; Chemical lasers.
A theory of inelastic n,l-changing and quasielastic l-mixing collisions of Rydberg atoms with the heavy rare-gas atoms is developed. It is based on the semiclassical impact-parameter approach combined with the normalized perturbation theory. Semiclassical formulas for scaled transition probabilities and cross sections as functions of the inelasticity parameter and the collision strength are analyzed. This approach gives a general description of collisional nl\ensuremath{\rightarrow}${\mathit{n}}^{\ensuremath{'}}$ transitions independently of the specific values of the principal quantum number, the relative velocity, and the type of colliding atoms. The energy and angular dependence of the electron-atom scattering amplitude is included in the theory by incorporating the impulse-approximation results in the weak-coupling limit. The Ramsauer-Townsend effect affects significantly the values of the cross sections, especially for the inelastic transitions with large energy transfer. The results obtained are used in calculations of the quenching cross sections for the Rb(nS,nD,nF) atoms in collisions with Ar, Kr, and Xe. Comparison of theory and experiment is made in a wide range of the principal quantum numbers and transition energy defects. \textcopyright{} 1996 The American Physical Society.
Collisional quenching of Rydberg states of Na(nl) atoms during the interaction with Sr (5s 2) and Ca (4s 2) atoms is theoretically studied. The effects of two quenching mechanisms are considered: the resonant one associated with transitions between ionic and covalent terms of a quasi-molecule formed during collisions and the non-resonant mechanism caused by quasi-free electron scattering by a perturbing atom. The ranges of the prevalence of these mechanisms are determined depending on the principal and orbital quantum numbers, as well as the electron affinities of the alkaline-earth atom.