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High-angular-momentum states in cold Rydberg gases.

S K Dutta1, D Feldbaum, A Walz-Flannigan

  • 1Department of Physics, University of Michigan, Ann Arbor, Michigan 48109-1120, USA.

Physical Review Letters
|May 1, 2001
PubMed
Summary
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Rydberg gases in cold-atom traps emit electrons for over 20 ms. This is due to collisions populating long-lived Rydberg states, causing slow thermal ionization.

Area of Science:

  • Atomic physics
  • Quantum mechanics
  • Cold atom experiments

Background:

  • Rydberg atoms are highly excited atoms with large principal quantum numbers.
  • Cold, dense Rydberg gases are created in laboratory settings for studying quantum phenomena.

Purpose of the Study:

  • To investigate the properties of cold, dense Rydberg gases.
  • To understand the mechanisms behind long-lasting electron emission from these gases.

Main Methods:

  • Spectroscopic methods were employed to analyze the Rydberg gas.
  • Time-resolved electron counting was used to measure electron emission.
  • Optical excitation was applied to Rydberg resonances.

Main Results:

  • Long-lasting electron emission (>20 ms) was observed from the Rydberg gas.

Related Experiment Videos

  • Observations are explained by l-mixing collisions between Rydberg atoms and slow electrons.
  • These collisions populate high-angular-momentum Rydberg states.

    • Conclusions:

    • The populated high-angular-momentum Rydberg states are long-lived.
    • These states undergo slow thermal ionization with high probabilities.
    • This explains the observed persistent electron emission.