Two-Photon Spectroscopy of Trapped Atomic Hydrogen

Claudio L. Cesar, Dale G. Fried, Thomas C. Killian, Adam D. Polcyn, Jon C. Sandberg, Ite A. Yu, Thomas J. Greytak, Daniel Kleppner, and John M. Doyle
Phys. Rev. Lett. 77, 255 – Published 8 July 1996
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Abstract

We report observation of the 1S-2S two-photon transition in hydrogen confined in a magnetic trap at submillikelvin temperatures. The excitation spectrum can display a sharp central feature arising from periodic motion of the trapped atoms. The metastable 2S atoms remain trapped, and have a lifetime close to the natural lifetime of 122 ms. These developments open the way to achieving the transition's natural linewidth. We have also demonstrated that the temperature of the gas can be determined from the line shape, providing an important tool for the study of cold trapped hydrogen. The resolution in these experiments appears to be limited by laser stability, currently 3 kHz.

  • Received 25 March 1996

DOI:https://doi.org/10.1103/PhysRevLett.77.255

©1996 American Physical Society

Authors & Affiliations

Claudio L. Cesar, Dale G. Fried, Thomas C. Killian, Adam D. Polcyn, Jon C. Sandberg, Ite A. Yu, Thomas J. Greytak, and Daniel Kleppner

  • Department of Physics and Center for Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139

John M. Doyle

  • Department of Physics, Harvard University, Cambridge, Massachusetts 02138

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Vol. 77, Iss. 2 — 8 July 1996

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