Precise measurements of s-wave scattering phase shifts with a juggling atomic clock

Steven Gensemer, Russell Hart, Ross Martin, Xinye Xu, Ronald Legere, Kurt Gibble, Servaas Kokkelmans

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We demonstrate an interferometric scattering technique that allows highly precise measurements of s-wave scattering phase shifts. We collide two clouds of cesium atoms in a juggling fountain clock. The atoms in one cloud are prepared in a coherent superposition of the two clock states and the atoms in the other cloud in an F,mF state. After the two clouds collide, we detect the scattered part of the clock atom's wavefunction for which the phase of the clock coherence is shifted by the difference of the s-wave phase shifts. In this way, we unambiguously observe the differences of scattering phase shifts. These phase shifts are independent of the atomic density to lowest order, enabling measurements of scattering phase shifts with clock accuracy. Recently, we have observed the changes in scattering phase shifts as a function of magnetic field over a range where Feshbach resonances may be expected and inelastic scattering channels open and close. Measurements like these will tightly constrain our knowledge of cesium-cesium interactions. With such knowledge, future measurements may place stringent limits on the time variation of fundamental constants, such as the electron-proton mass ratio, by precisely probing phase shifts near a Feshbach resonance.

Original languageEnglish (US)
Title of host publicationProceedings of the 7th Symposium on Frequency Standards and Metrology, ISFSM 2008
Pages91-99
Number of pages9
StatePublished - Dec 1 2009
Event7th Symposium on Frequency Standards and Metrology, ISFSM 2008 - Pacific Grove, CA, United States
Duration: Oct 5 2008Oct 11 2008

Publication series

NameProceedings of the 7th Symposium on Frequency Standards and Metrology, ISFSM 2008

Other

Other7th Symposium on Frequency Standards and Metrology, ISFSM 2008
CountryUnited States
CityPacific Grove, CA
Period10/5/0810/11/08

Fingerprint

Atomic clocks
Phase shift
Scattering
Clocks
Cesium
Atoms
Fountains
Inelastic scattering
Wave functions
Protons
Magnetic fields
Electrons

All Science Journal Classification (ASJC) codes

  • Computer Science (miscellaneous)

Cite this

Gensemer, S., Hart, R., Martin, R., Xu, X., Legere, R., Gibble, K., & Kokkelmans, S. (2009). Precise measurements of s-wave scattering phase shifts with a juggling atomic clock. In Proceedings of the 7th Symposium on Frequency Standards and Metrology, ISFSM 2008 (pp. 91-99). (Proceedings of the 7th Symposium on Frequency Standards and Metrology, ISFSM 2008).
Gensemer, Steven ; Hart, Russell ; Martin, Ross ; Xu, Xinye ; Legere, Ronald ; Gibble, Kurt ; Kokkelmans, Servaas. / Precise measurements of s-wave scattering phase shifts with a juggling atomic clock. Proceedings of the 7th Symposium on Frequency Standards and Metrology, ISFSM 2008. 2009. pp. 91-99 (Proceedings of the 7th Symposium on Frequency Standards and Metrology, ISFSM 2008).
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abstract = "We demonstrate an interferometric scattering technique that allows highly precise measurements of s-wave scattering phase shifts. We collide two clouds of cesium atoms in a juggling fountain clock. The atoms in one cloud are prepared in a coherent superposition of the two clock states and the atoms in the other cloud in an F,mF state. After the two clouds collide, we detect the scattered part of the clock atom's wavefunction for which the phase of the clock coherence is shifted by the difference of the s-wave phase shifts. In this way, we unambiguously observe the differences of scattering phase shifts. These phase shifts are independent of the atomic density to lowest order, enabling measurements of scattering phase shifts with clock accuracy. Recently, we have observed the changes in scattering phase shifts as a function of magnetic field over a range where Feshbach resonances may be expected and inelastic scattering channels open and close. Measurements like these will tightly constrain our knowledge of cesium-cesium interactions. With such knowledge, future measurements may place stringent limits on the time variation of fundamental constants, such as the electron-proton mass ratio, by precisely probing phase shifts near a Feshbach resonance.",
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Gensemer, S, Hart, R, Martin, R, Xu, X, Legere, R, Gibble, K & Kokkelmans, S 2009, Precise measurements of s-wave scattering phase shifts with a juggling atomic clock. in Proceedings of the 7th Symposium on Frequency Standards and Metrology, ISFSM 2008. Proceedings of the 7th Symposium on Frequency Standards and Metrology, ISFSM 2008, pp. 91-99, 7th Symposium on Frequency Standards and Metrology, ISFSM 2008, Pacific Grove, CA, United States, 10/5/08.

Precise measurements of s-wave scattering phase shifts with a juggling atomic clock. / Gensemer, Steven; Hart, Russell; Martin, Ross; Xu, Xinye; Legere, Ronald; Gibble, Kurt; Kokkelmans, Servaas.

Proceedings of the 7th Symposium on Frequency Standards and Metrology, ISFSM 2008. 2009. p. 91-99 (Proceedings of the 7th Symposium on Frequency Standards and Metrology, ISFSM 2008).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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N2 - We demonstrate an interferometric scattering technique that allows highly precise measurements of s-wave scattering phase shifts. We collide two clouds of cesium atoms in a juggling fountain clock. The atoms in one cloud are prepared in a coherent superposition of the two clock states and the atoms in the other cloud in an F,mF state. After the two clouds collide, we detect the scattered part of the clock atom's wavefunction for which the phase of the clock coherence is shifted by the difference of the s-wave phase shifts. In this way, we unambiguously observe the differences of scattering phase shifts. These phase shifts are independent of the atomic density to lowest order, enabling measurements of scattering phase shifts with clock accuracy. Recently, we have observed the changes in scattering phase shifts as a function of magnetic field over a range where Feshbach resonances may be expected and inelastic scattering channels open and close. Measurements like these will tightly constrain our knowledge of cesium-cesium interactions. With such knowledge, future measurements may place stringent limits on the time variation of fundamental constants, such as the electron-proton mass ratio, by precisely probing phase shifts near a Feshbach resonance.

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Gensemer S, Hart R, Martin R, Xu X, Legere R, Gibble K et al. Precise measurements of s-wave scattering phase shifts with a juggling atomic clock. In Proceedings of the 7th Symposium on Frequency Standards and Metrology, ISFSM 2008. 2009. p. 91-99. (Proceedings of the 7th Symposium on Frequency Standards and Metrology, ISFSM 2008).