Near-ionization-threshold emission in atomic gases driven by intense sub-cycle pulses

We study theoretically the dipole radiation of a hydrogen atom driven by an intense sub-cycle pulse. The time-dependent Schr\"odinger equation for the system is solved by ab initio calculation to obtain the dipole response. Remarkably, a narrowband emission lasting longer than the driving pulse...

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Bibliographic Details
Published in:arXiv.org 2016-02
Main Authors: Wei-Chun, Chu, Travers, John C, Russell, Philip St J
Format: Article
Language:English
Subjects:
Atomic structure
Dipoles
Electrons
Emission analysis
Ionization
Mathematical analysis
Narrowband
Time dependence
Online Access:Get full text
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Summary:We study theoretically the dipole radiation of a hydrogen atom driven by an intense sub-cycle pulse. The time-dependent Schr\"odinger equation for the system is solved by ab initio calculation to obtain the dipole response. Remarkably, a narrowband emission lasting longer than the driving pulse appears at a frequency just above the ionization threshold. An additional calculation using the strong field approximation also recovers this emission, which suggests that it corresponds to the oscillation of nearly-bound electrons that behave similarly to Rydberg electrons. The predicted phenomenon is unique to ultrashort driving pulses but not specific to any particular atomic structure.
ISSN:2331-8422
DOI:10.48550/arxiv.1503.07324