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Electrostatically Guided Rydberg Positronium.

A Deller1, A M Alonso1, B S Cooper1

  • 1Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom.

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This summary is machine-generated.

Positronium atoms in Rydberg-Stark states were guided using electric fields. Guiding low-field-seeking states increased detection fivefold, demonstrating electric field control of positronium trajectories.

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Area of Science:

  • Atomic Physics
  • Quantum Mechanics
  • Particle Physics

Background:

  • Positronium (Ps) is a simple atomic system composed of an electron and a positron.
  • Rydberg states of atoms exhibit unique properties due to their large principal quantum numbers.
  • Electric fields can influence the behavior of charged particles and atoms in specific states.

Purpose of the Study:

  • To investigate the guiding of positronium atoms using inhomogeneous electric fields.
  • To explore the control of positronium trajectories via Stark effects in Rydberg states.
  • To demonstrate the feasibility of electrostatic guiding for positronium atoms.

Main Methods:

  • Preparation of positronium atoms in Rydberg-Stark states (n=10) using two-color, two-photon optical excitation.
  • Application of a 670 V/cm electric field during excitation.
  • Guiding of excited positronium atoms through a 0.4 m electrostatic quadrupole guide.
  • Detection of positronium atoms at the end of the guide via annihilation gamma radiation.

Main Results:

  • A fivefold increase in detected positronium atoms was observed when exciting low-field-seeking Stark states.
  • No positronium atoms were detected when exciting high-field-seeking states.
  • The experimental results align with theoretical calculations of the guide's geometrical acceptance.

Conclusions:

  • Inhomogeneous electric fields can effectively guide positronium atoms in Rydberg-Stark states.
  • The ability to control the trajectories of positronium atoms opens new avenues for experimental manipulation.
  • This technique demonstrates precise control over positronium atom motion, consistent with theoretical predictions.