Possible M1 - E1 interference effects in m1 forbidden transitions with crossed magnetic and electric fields

Bouchiat, Marie-Anne; Poirier, Michel

doi:10.1051/jphys:01982004305072900

Cited by 13 publications

(5 citation statements)

References 12 publications

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“…These signals have proved useful for calibrating the PV signal and as atomic probes of experimental imperfections (part II). References [37,38] give a detailed analysis of the new effects arising from M'-Stark or Stark-Stark interference in a magnetic field of arbitrary direction. In the PV experiment two classes of effects are involved : hyperfine mixing, and Hanle effect.…”

Section: Atomic Signals In Non-zero Magnetic Field -mentioning

confidence: 99%

“…In this appendix, we study new terms which appear in the expression of the fluorescence signal when a magnetic field H is present in addition to the Stark field E. The details of the calculation can be found in references [37,38]. Here we only outline the assumptions and the results relevant to our PV experiments.…”

Section: Appendix Bmentioning

confidence: 99%

“…9)) considered as the source term. The off-resonance contribution, from degeneracy lifting [37], is omitted in (B. 9) in view of the minor role played by this signal in the PV experiment.…”

Section: Appendix Bmentioning

confidence: 99%

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Atomic parity violation measurements in the highly forbidden 6S 1/2-7S1/2 caesium transition. - I. Theoretical analysis, procedure and apparatus

1985

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2014 Cet article est la première partie d'une présentation détaillée des mesures de violation de parité réalisées sur deux composantes hyperfines de la transition très interdite 6S-7S de l'atome de césium. Lors de l'excitation par un faisceau laser polarisé circulairement dans un champ électrique statique il y a interférence entre une amplitude électromagnétique induite par le champ et l'amplitude induite par l'interaction faible. Cette interférence engendre dans la polarisation électronique de l'état 7S une contribution qui se comporte comme un vecteur polaire lorsqu'on inverse la chiralité de l'expérience. En principe seule cette contribution est observée dans la direction d'observation choisie. On la détecte par l'intermédiaire du taux de polarisation circulaire de la fluorescence 7S-6P1/2. Par effet Hanle dans un champ magnétique appliqué périodiquement, on observe de la même manière la contribution conservant la parité, ce qui permet de calibrer l'expérience. Le résultat final est le rapport Im Epv1/03B2 de l'amplitude violant la parité à la polarisabilité vectorielle. Notre valeur est ( 2014 1,56 ± 0,17 (stat.) ± 0,12 (syst.)) mV/cm. Ci-après nous donnons les expressions de tous les signaux atomiques disponibles, puis nous décrivons l'appareillage et les méthodes expérimentales.Abstract. 2014 This paper is the first part of a detailed presentation of parity violation measurements performed in two hfs components of the highly forbidden 6S-7S transition of the Cs atom. Under excitation by a circularly polarized laser in a dc electric field, interference takes place between an electromagnetic amplitude induced by the field and the parity-violating amplitude induced by weak interactions. This interference gives rise in the electronic polarization of the 7S state to a contribution which behaves like a vector when the handedness of the experiment is reversed In principle, only this contribution is observed in the chosen direction of observation. Detection proceeds through the circular polarization ratio of the 7S-6P1/2 fluorescence. By Hanle effect in a magnetic field applied periodically, the parity-conserving contribution is observed in the same way and used to calibrate the experiment. The final result is the ratio Im Epv1/03B2 of the parity-violating amplitude to the vector polarizability. Our value is ( 2014 1.56 ± 0.17 (stat.) ± 0.12 (syst.)) mV/cm. In what follows, we give the formulae for all available atomic signals and describe the apparatus and procedures.

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Section: Atomic Signals In Non-zero Magnetic Field -mentioning

confidence: 99%

Section: Appendix Bmentioning

confidence: 99%

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Atomic parity violation measurements in the highly forbidden 6S 1/2-7S1/2 caesium transition. - I. Theoretical analysis, procedure and apparatus

1985

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“…Highly-forbidden optical transitions have been measured with great precision using the interference between the forbidden transition and a much stronger transition between the same two states. Key examples of these techniques are found in measurements of magnetic dipole transitions [1][2][3][4][5][6][7][8], electric quadrupole transitions [9,10], and parity nonconserving (PNC) electroweak interactions [11][12][13][14][15][16][17][18][19]. Still, pushing the precision of these measurements to greater limits, as well as extending them to a variety of other atomic systems, is an active pursuit, in that it will allow further tests of the Standard model and of nucleon-nucleon interactions within the nucleus [20,21].…”

Section: Introductionmentioning

confidence: 99%

Analysis of two-pathway coherent control for precision measurement of weak optical transitions

Antypas,

Elliott

2010

Preprint

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We present a new technique based on two-pathway optical coherent control for the sensitive detection and precise measurement of highly-forbidden transitions in atomic systems. Specifically, we show that (ω, 2ω) coherent control can be applied to the measurement of the magnetic dipole and electroweak parity nonconserving amplitudes in atomic cesium, with the principal advantage of reduced systematic errors related to field reversals often encountered in previous measurements of these effects. We present a complete analysis in one specific geometry, and discuss prospects for improved laboratory determinations of these weak transition amplitudes.

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“…This is a crucial advantage in the case of our parity violation experiment, since many possible systematics can be shown to belong to the category of suppressed signals (in contrast with the parity violation signal under search) : e.g. systematics associated with a stray magnetic field along the laser beam [4].…”

mentioning

confidence: 99%

A cesium cell with laser beam multipass

Bouchiat

Pottier

Trénec

1980

Rev. Phys. Appl. (Paris)

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Possible M1 - E1 interference effects in m1 forbidden transitions with crossed magnetic and electric fields

Cited by 13 publications

References 12 publications

Atomic parity violation measurements in the highly forbidden 6S 1/2-7S1/2 caesium transition. - I. Theoretical analysis, procedure and apparatus

Atomic parity violation measurements in the highly forbidden 6S 1/2-7S1/2 caesium transition. - I. Theoretical analysis, procedure and apparatus

Analysis of two-pathway coherent control for precision measurement of weak optical transitions

A cesium cell with laser beam multipass

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