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Updated: Aug 11, 2026

Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
Published on: October 9, 2012
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.
Abstract:
Cold, dense Rydberg gases produced in a cold-atom trap are investigated using spectroscopic methods and time-resolved electron counting. Optical excitation on the discrete Rydberg resonances reveals long-lasting electron emission from the Rydberg gas ( >20 ms). Our observations are explained by lm-mixing collisions between Rydberg atoms and slow electrons that lead to the population of long-lived high-angular-momentum Rydberg states. These atoms thermally ionize slowly and with large probabilities.
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