Polarization independence of microwave {open_quote}{open_quote}ionization{close_quote}{close_quote} thresholds of excited hydrogen atoms near the principal resonance
- Department of Physics, State University of New York, Stony Brook, New York 11794-3800 (United States)
We study experimentally and theoretically how the polarization of a 9.904 GHz field affects threshold amplitudes for many-photon {open_quote}{open_quote}ionization{close_quote}{close_quote} of {ital n}{sub 0}=70,...,98 H atoms. That peak-field thresholds for circular polarization are {ital lower} than for linear polarization (with those for elliptical polarization intermediate) in the main resonance zone is a consequence of a time-scale separation in the 3D dynamics there. When an amplitude scaling relationship given by the theory is used, the experimental data confirm that, near onset, the scaled ionization thresholds are approximately independent of polarization. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 278809
- Journal Information:
- Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 6 Vol. 76; ISSN 0031-9007; ISSN PRLTAO
- Country of Publication:
- United States
- Language:
- English
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