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

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Chu,  Wei-Chun
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Travers,  John C.
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Russell,  Philip St J.
Russell Division, Max Planck Institute for the Science of Light, Max Planck Society;

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Citation

Chu, W.-C., Travers, J. C., & Russell, P. S. J. (2016). Near-ionization-threshold emission in atomic gases driven by intense sub-cycle pulses. NEW JOURNAL OF PHYSICS, 18: 023018. doi:10.1088/1367-2630/18/2/023018.


Cite as: http://hdl.handle.net/11858/00-001M-0000-002D-630F-B
Abstract
We study theoretically the dipole radiation of a hydrogen atom driven by an intense sub-cycle pulse. The time-dependent Schrodinger 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.