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 the Physical Society

On the transfer of coherence in atomic collisions

George William Series

Published Apr 1, 1967• 12 citations
Publisher

Abstract

It is pointed out that a recent observation by Gough on the polarization of sensitized fluorescence constitutes an experimental demonstration of the transfer of coherence from mercury to cadmium atoms in collisions of the second kind. The implications of this are discussed.
DOI
10.1088/0370-1328/90/4/129

Related papers

The polarization of sensitized fluorescence

W Gough

By means of the selection rule Σ m J = constant along the axis of a collision between two atoms, it is shown that sensitized fluorescence should in some cases be partially polarized. The degree of polarization of the fluorescence of cadmium vapour sensitized by the presence of mercury vapour is calculated for certain states of polarization of the incident radiation. In the case studied experimentally the degree of polarization varies over a range of 2-5%. The theoretical value is 3/11, which is reduced in practice by various depolarizing effects. The possibility of transfer coherence between eigenstates from mercury to cadmium during a collision is considered.

Proceedings of the Physical Society•Jan 1, 1967•29 citations

Experimental evidence about the mechanism of excitation transfer in mercury-cadmium sensitized fluorescence

Bernard Cheron

Optics Communications•Aug 1, 1971•7 citations

Collisional Transfer of Coherence: Polarization of Sensitized Fluorescence

Lue‐Yung Chow Chiu

Energy transfer and coherence transfer between two atoms of different species are studied theoretically. The electric dipole-dipole interaction is the mechanism considered for the excitation transfer. A generalized perturbation method for a damping system is used. A general formula is derived for the polarization of the sensitized fluorescence resulting from the excitation transfer. This polarization is shown to be dependent on the angular momenta of the two atoms, and to be independent of their relative velocity as well as of their difference in the energy of excitation. The polarizations are found to be nonzero in many cases which demonstrate the transfer of coherence through collision processes. A general and compact formula is also derived for the polarization of pure fluorescence where excitation exchange has not taken place. The polarization of the sensitized fluorescence is in general smaller than that of the pure fluorescence. This means that the coherence is transferred only partially. Finally, the magnetic field effect has been included. This field depolarization depends on the ${g}_{j}$ values and the lifetimes of the excited states of both atoms. The general feature of the field dependence also differs considerably from that of the Hanle effect for resonance fluorescence.

Physical Review A•May 1, 1972•6 citations

Étude du transfert d'excitation et de cohérence dans la fluorescence sensibilisée mercure-cadmium : I. — Étude théorique

Bernard Cheron

L'auteur étudie le transfert d'excitation et de cohérence lors de collisions de seconde espèce non résonnantes entre un atome de mercure excité optiquement et un atome de cadmium dans l'état fondamental : Hg(6 3P 1) + Cd(5 1S0) → Hg(6 1S 0) + Cd(5 3P1) + 1,08 eV. Un modèle de collision dans lequel les collisions frontales jouent un rôle prépondérant est présenté et les taux de transfert d'orientation et d'alignement sont calculés. Dans ce modèle, le degré d'orientation ou d'alignement des atomes de cadmium dépend de la direction de la vitesse de ces atomes après le transfert d'excitation. L'influence du spin nucléaire est étudiée.

Journal de physique•Jan 1, 1975•16 citations

Evidence of Rb-Cd second kind collision by space charge amplification

EUGEN BADAREU, G. Musa, Z. Mariş

The work presented here was intended to establish the ionisation of rubidium by collision of the second kind with excited cadmium atoms on the resonance level.

Electronics Letters•Mar 1, 1965•2 citations

XXII.Double excitation of upper levels in the mercury atoms by collisions of the second kind

H. Beutler, Berthold Josephy

The London Edinburgh and Dublin Philosophical Magazine and Journal of Science•Jan 1, 1928•4 citations
By means of the selection rule Σ m J = constant along the axis of a collision between two atoms, it is shown that sensitized fluorescence should in some cases be partially polarized. The degree of polarization of the fluorescence of cadmium vapour sensitized by the presence of mercury vapour is calculated for certain states of polarization of the incident radiation. In the case studied experimentally the degree of polarization varies over a range of 2-5%. The theoretical value is 3/11, which is reduced in practice by various depolarizing effects. The possibility of transfer coherence between eigenstates from mercury to cadmium during a collision is considered.
Energy transfer and coherence transfer between two atoms of different species are studied theoretically. The electric dipole-dipole interaction is the mechanism considered for the excitation transfer. A generalized perturbation method for a damping system is used. A general formula is derived for the polarization of the sensitized fluorescence resulting from the excitation transfer. This polarization is shown to be dependent on the angular momenta of the two atoms, and to be independent of their relative velocity as well as of their difference in the energy of excitation. The polarizations are found to be nonzero in many cases which demonstrate the transfer of coherence through collision processes. A general and compact formula is also derived for the polarization of pure fluorescence where excitation exchange has not taken place. The polarization of the sensitized fluorescence is in general smaller than that of the pure fluorescence. This means that the coherence is transferred only partially. Finally, the magnetic field effect has been included. This field depolarization depends on the gj{g}_{j}gj​ values and the lifetimes of the excited states of both atoms. The general feature of the field dependence also differs considerably from that of the Hanle effect for resonance fluorescence.
L'auteur étudie le transfert d'excitation et de cohérence lors de collisions de seconde espèce non résonnantes entre un atome de mercure excité optiquement et un atome de cadmium dans l'état fondamental : Hg(6 3P 1) + Cd(5 1S0) → Hg(6 1S 0) + Cd(5 3P1) + 1,08 eV. Un modèle de collision dans lequel les collisions frontales jouent un rôle prépondérant est présenté et les taux de transfert d'orientation et d'alignement sont calculés. Dans ce modèle, le degré d'orientation ou d'alignement des atomes de cadmium dépend de la direction de la vitesse de ces atomes après le transfert d'excitation. L'influence du spin nucléaire est étudiée.