Geometric-phase-induced false electric dipole moment signals for particles in traps

Journal Article · Wed Sep 01 04:00:00 EDT 2004 · Physical Review. A

DOI:https://doi.org/10.1103/PhysRevA.70.032102· OSTI ID:20645994

Pendlebury, J M; Harris, P G; Richardson, J D; Baskin, R J; Doyle, D D; May, D J.R.; Smith, K F ^[1]; Heil, W; Sobolev, Yu ^[2]; Geltenbort, P ^[3]; Green, K; Iaydjiev, P S; Ivanov, S N ^[4]

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1. Department of Physics and Astronomy, University of Sussex, Brighton, BN1 9QH (United Kingdom)
2. Institut of Physics, 55099 Mainz (Germany)
3. Institut Laue Langevin, Boite Postale. 156, 38042 Grenoble (France)
4. Rutherford Appleton Laboratory, Chilton, Didcot, OX11 0QX (United Kingdom)

Theories are developed to evaluate Larmor frequency shifts, derived from geometric phases, in experiments to measure electric dipole moments (EDM's) of trapped, atoms, molecules, and neutrons. A part of these shifts is proportional to the applied electric field and can be interpreted falsely as an electric dipole moment. A comparison is made between our theoretical predictions for these shifts and some results from our recent experiments, which shows agreement to within the experimental errors of 15%. The comparison also demonstrates that some trapped particle EDM experiments have reached a sensitivity where stringent precautions are needed to minimize and control such false EDM's. Computer simulations of these processes are also described. They give good agreement with the analytical results and they extend the study by investigating the influence of varying surface reflection laws in the hard-walled traps considered. They also explore the possibility to suppress such false EDM's by introducing collisions with buffer gas particles. Some analytic results for frequency shifts proportional to the square of the E field are also given and there are results for the averaging of the B field in the absence of an E field.

• OSTI ID: 20645994
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 3 Vol. 70; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
ATOMS
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
CONTROL
ELECTRIC DIPOLE MOMENTS
ELECTRIC FIELDS
MOLECULES
NEUTRONS
REFLECTION
SENSITIVITY
SURFACES
TRAPPING
WEAK INTERACTIONS