Positronium cooling in porous silica measured via Doppler spectroscopy

D. B. Cassidy, P. Crivelli, T. H. Hisakado, L. Liszkay, V. E. Meligne, P. Perez, H. W. K. Tom, and A. P. Mills, Jr.
Phys. Rev. A 81, 012715 – Published 29 January 2010; Erratum Phys. Rev. A 81, 039904 (2010)

Abstract

We have measured the kinetic energy of positronium (Ps) atoms emitted into a vacuum from a porous silica film subsequent to positron bombardment, via the Doppler spread of the linewidth of the Ps 13S-23P transition. We find that the deeper in the target film that positrons are implanted the colder is the emitted Ps, an effect we attribute to cooling via collisions in the pores as the atoms diffuse back to the film surface. We observed a lower limit to the mean Ps kinetic energy associated with motion in the direction of the laser, Ex=42±3 meV, that is consistent with conversion of the confinement energy of Ps in the 2.7-nm-diameter pores to kinetic energy in vacuum. An implication is that a porous sample would need to be composed of pores greater than around 10 nm in diameter in order to produce thermal Ps in vacuum with temperatures of less than 100 K. By performing Doppler spectroscopy on intense pulses of Ps we have experimentally demonstrated the production of many excited-state Ps atoms simultaneously, which could have numerous applications, including laser cooling and fundamental spectroscopic studies of Ps and the production of antihydrogen.

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  • Received 10 November 2009
  • Corrected 2 March 2010

DOI:https://doi.org/10.1103/PhysRevA.81.012715

©2010 American Physical Society

Corrections

2 March 2010

Erratum

Publisher’s Note: Positronium cooling in porous silica measured via Doppler spectroscopy [Phys. Rev. A 81, 012715 (2010)]

D. B. Cassidy, P. Crivelli, T. H. Hisakado, L. Liszkay, V. E. Meligne, P. Perez, H. W. K. Tom, and A. P. Mills, Jr.
Phys. Rev. A 81, 039904 (2010)

Authors & Affiliations

D. B. Cassidy1, P. Crivelli2, T. H. Hisakado1, L. Liszkay3,*, V. E. Meligne1, P. Perez3, H. W. K. Tom1, and A. P. Mills, Jr.1

  • 1Department of Physics and Astronomy, University of California, Riverside, California 92521-0413, USA
  • 2URFJ, Rio de Janeiro, Brazil
  • 3CEA, Saclay, IRFU, F-91191 Gif-sur-Yvette Cedex, France

  • *On leave from KFKI Research Institute for Nuclear and Particle Physics, P.O. Box 49, H-1525 Budapest, Hungary.

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Vol. 81, Iss. 1 — January 2010

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