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

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

He(21S,21P) + Yb(1S 0 ) interaction cross sections

Emiliya Dimova, Kiril B. Blagoev

Published May 7, 1999• 0 citations
Publisher

Abstract

In this paper He(21 S, 21P)+M interaction processes are investigated. There are no experimental data in the literature about the quenching cross sections of He(21 S, 21P) states by collisions with atoms of Rare Earth Elements. In this paper we report the preliminary results of the quenching of He(21 S, 21P) excited states by Yb atoms. A time resolved method and pulse electron excitation is used in this experiment. A comparison of the theoretical results and the experimental data are made.

DOI
10.1117/12.347619

Related papers

Collisional depopulation of rubidium Rydberg levels by rare gases

M Hugon, B. Sayer, P. R. Fournier +1 more

The cross sections for the quenching of highly excited Rb(nS) (32<or=n<or=45) and Rb(nD) (30<or=n<or=41) states have been measured for the different rare gases. In most cases studied, the quenching cross sections seem rather constant or slightly decreasing with n for a given series and a given rare gas. The experimental data are compared with the results of calculations using various theoretical approaches. It is shown that in this range of large n values the main process responsible for the quenching is the Rydberg-electron-rare-gas interaction, as previously stated for lower n values (10<or=n<or=20).

Journal of Physics B Atomic and Molecular Physics•Aug 14, 1982•34 citations

Thermal collisions between highly excited and ground-state alkali atoms

M Hugon, F. Gounand, P. R. Fournier

Measurements have been made of the cross sections for collisional quenching of highly excited rubidium nS (12<or=n<or=18) and nD 3/2 (9<or=n<or=13) states by ground-state rubidium. The experimental values are shown to be close to the geometrical cross section. The large magnitude of the quenching cross section mainly reflects the long range of the Rydberg electron-alkali interaction.

Journal of Physics B Atomic and Molecular Physics•Feb 14, 1980•27 citations

Inelastic collisions between high Rydberg (n≈40) and ground-state rubidium atoms at thermal energies

M Hugon, F. Gounand, P. R. Fournier +1 more

The authors have measured the cross sections for the collisional quenching of highly excited (34<or=n<or=43) S rubidium atoms by ground-state rubidium atoms. The comparison between their data and the values calculated using a theoretical approach that only takes into account the valence electron-ground-state rubidium interaction provides the first experimental estimation of the cross section for the elastic scattering of ultra-low-energy electrons (E approximately=0.01 eV) by rubidium atoms. Their results for the quenching are connected to the available measurements of the self-broadening of the rubidium (5S-nS) lines by using a recent theoretical model: for n approximately 40 the self-broadcasting is essentially due to inelastic collisions. An upper limit is given for the cross section for the isotopic transfer between 85 Rb(nS) and 87 Rb(nS) states due to collisions with ground-state rubidium atoms.

Journal of Physics B Atomic and Molecular Physics•Jul 28, 1983•15 citations

Excitation transfer in barium by collisions with noble gases

J. Brust, Alan C. Gallagher

We present a time resolved study of excitation transfer processes between the low lying excited states of barium (6s6p $^{3}$${\mathit{P}}_{\mathit{J}}$, 6s5d $^{1}$${\mathit{D}}_{2}$, 6s5d $^{3}$${\mathit{D}}_{\mathit{J}}$) induced by collisions with noble gases. The transient excited state populations have been measured by means of fluorescence and absorption spectroscopy. Cross sections for spin-changing collisions from $^{3}$${\mathit{P}}_{1}$ to $^{1}$${\mathit{D}}_{2}$ and from $^{1}$${\mathit{D}}_{2}$ to $^{3}$${\mathit{D}}_{3}$ as well as for fine-structure mixing within the $^{3}$D multiplet were obtained by fitting the numerical solution of a seven-state system of rate equations including diffusion to the experimental data. We compare our results to experimental findings for other alkaline earth metals and report an improved value of the lifetime of the 6s6p $^{3}$${\mathit{P}}_{1}$ state of barium.

Physical Review A•Sep 1, 1995•34 citations

Quenching collisions of rubidium in the nS (32⩽n⩽45) Rydberg levels with helium

M Hugon, P. R. Fournier, E. de Prunelé

Reports measurements of the cross sections for collisional quenching of highly excited rubidium nS (32<or=n<or=45) states by helium. A time-resolved selective field ionisation technique is used for this study. The experimental results are compared with the values calculated using an approximate scaling formula.

Journal of Physics B Atomic and Molecular Physics•Nov 14, 1981•11 citations

Electron-atom collisions: From Franck-Hertz experiment to atom traps

Chang-Chun Lin

The key features of the cross sections for electron-impact excitation out of the ground levels of the rare-gas atoms are summarized and application of these cross section data is shown. This is followed by discussions of recent experiments on determination of electron-impact cross sections for excitation out of the metastable levels of He and Ar. The metastiable atom targets are produced by two different methods, i.e., hollow-cathode discharges and charge-exchange collisions of rare-gas ions with Cs atoms. The former method is simple but is limited to low electron energies because of the very small metastable concentration, whereas the latter method yields a fast target beam with predominantly metastable atoms allowing measurements up to the keV range. The measured cross sections show features very different from those of excitation out of the ground levels. Another new development in electron-atom collision is the use of atom traps for measuring ionization cross sections. The experiment is conducted by passing an electron beam pulse through magneto-optically trapped Rb atoms while the trap is momentarily turned off. Turning the trap back on immediately after the electron beam pulse recaptures the unionized atoms allowing only the ions to escape. The ionization cross section is determined bymore » measuring the electron beam current density at the trapped atom region and the fractional loss of trapped atoms due to the electron beam. This method avoids measurements of the absolute number of the target atoms and the overlap between the atomic and electron beams and therefore eliminates the major sources of uncertainty associated with the crossed-beam method for measuring ionization cross section.« less

Bulletin of the American Physical Society•May 1, 1996•0 citations
In this paper He(21 S, 21P)+M interaction processes are investigated. There are no experimental data in the literature about the quenching cross sections of He(21 S, 21P) states by collisions with atoms of Rare Earth Elements. In this paper we report the preliminary results of the quenching of He(21 S, 21P) excited states by Yb atoms. A time resolved method and pulse electron excitation is used in this experiment. A comparison of the theoretical results and the experimental data are made.
The cross sections for the quenching of highly excited Rb(nS) (32<or=n<or=45) and Rb(nD) (30<or=n<or=41) states have been measured for the different rare gases. In most cases studied, the quenching cross sections seem rather constant or slightly decreasing with n for a given series and a given rare gas. The experimental data are compared with the results of calculations using various theoretical approaches. It is shown that in this range of large n values the main process responsible for the quenching is the Rydberg-electron-rare-gas interaction, as previously stated for lower n values (10<or=n<or=20).
The authors have measured the cross sections for the collisional quenching of highly excited (34<or=n<or=43) S rubidium atoms by ground-state rubidium atoms. The comparison between their data and the values calculated using a theoretical approach that only takes into account the valence electron-ground-state rubidium interaction provides the first experimental estimation of the cross section for the elastic scattering of ultra-low-energy electrons (E approximately=0.01 eV) by rubidium atoms. Their results for the quenching are connected to the available measurements of the self-broadening of the rubidium (5S-nS) lines by using a recent theoretical model: for n approximately 40 the self-broadcasting is essentially due to inelastic collisions. An upper limit is given for the cross section for the isotopic transfer between 85 Rb(nS) and 87 Rb(nS) states due to collisions with ground-state rubidium atoms.
We present a time resolved study of excitation transfer processes between the low lying excited states of barium (6s6p 3^{3}3PJ{\mathit{P}}_{\mathit{J}}PJ​, 6s5d 1^{1}1D2{\mathit{D}}_{2}D2​, 6s5d 3^{3}3DJ{\mathit{D}}_{\mathit{J}}DJ​) induced by collisions with noble gases. The transient excited state populations have been measured by means of fluorescence and absorption spectroscopy. Cross sections for spin-changing collisions from 3^{3}3P1{\mathit{P}}_{1}P1​ to 1^{1}1D2{\mathit{D}}_{2}D2​ and from 1^{1}1D2{\mathit{D}}_{2}D2​ to 3^{3}3D3{\mathit{D}}_{3}D3​ as well as for fine-structure mixing within the 3^{3}3D multiplet were obtained by fitting the numerical solution of a seven-state system of rate equations including diffusion to the experimental data. We compare our results to experimental findings for other alkaline earth metals and report an improved value of the lifetime of the 6s6p 3^{3}3P1{\mathit{P}}_{1}P1​ state of barium.
The key features of the cross sections for electron-impact excitation out of the ground levels of the rare-gas atoms are summarized and application of these cross section data is shown. This is followed by discussions of recent experiments on determination of electron-impact cross sections for excitation out of the metastable levels of He and Ar. The metastiable atom targets are produced by two different methods, i.e., hollow-cathode discharges and charge-exchange collisions of rare-gas ions with Cs atoms. The former method is simple but is limited to low electron energies because of the very small metastable concentration, whereas the latter method yields a fast target beam with predominantly metastable atoms allowing measurements up to the keV range. The measured cross sections show features very different from those of excitation out of the ground levels. Another new development in electron-atom collision is the use of atom traps for measuring ionization cross sections. The experiment is conducted by passing an electron beam pulse through magneto-optically trapped Rb atoms while the trap is momentarily turned off. Turning the trap back on immediately after the electron beam pulse recaptures the unionized atoms allowing only the ions to escape. The ionization cross section is determined bymore » measuring the electron beam current density at the trapped atom region and the fractional loss of trapped atoms due to the electron beam. This method avoids measurements of the absolute number of the target atoms and the overlap between the atomic and electron beams and therefore eliminates the major sources of uncertainty associated with the crossed-beam method for measuring ionization cross section.« less