Ionization of Na Rydberg Atoms by Subpicosecond Quarter-Cycle Circularly Polarized Pulses

Thomas J. Bensky, University of Virginia - Main Campus
G. Haeffler, University of Virginia - Main Campus
Robert R. Jones, University of Virginia - Main Campus

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http://dx.doi.org/10.1103/PhysRevLett.79.2018. Copyright © 1997 The American Physical Society.

NOTE: At the time of publication, the author Thomas Bensky was not yet affiliated with Cal Poly.

Abstract

We report the first observation of ionization of Rydberg atoms by subpicosecond, circularly polarized THz radiation. The field amplitude in these pulses is non-negligible for only one-quarter of an optical cycle. The experiment is performed in the short-pulse regime, where the duration of the ionizing pulse is shorter than the classical Kepler period of the Rydberg electron. We find that the ionization probability for these atoms is remarkably insensitive to the time-varying polarization of the THz field.