Attosecond transient-absorption spectroscopy of polar molecules

We apply attosecond transient absorption spectroscopy (ATAS) to explore the effects of a nonzero permanent dipole on electron dynamics at the subfemtosecond scale, exemplified in the polar LiF molecule. In contrast with nonpolar systems, a familiar feature of the ATA spectra--the light-induced struc...

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Bibliographic Details
Published in:arXiv.org 2018-09
Main Authors: Jørgen Johansen Rørstad, Ravn, Nikolaj S W, Lun Yue, Lars Bojer Madsen
Format: Article
Language:English
Subjects:
Absorption spectroscopy
Adiabatic flow
Computer simulation
Dipoles
Lithium fluoride
Mathematical models
Spectrum analysis
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Summary:We apply attosecond transient absorption spectroscopy (ATAS) to explore the effects of a nonzero permanent dipole on electron dynamics at the subfemtosecond scale, exemplified in the polar LiF molecule. In contrast with nonpolar systems, a familiar feature of the ATA spectra--the light-induced structures--are observed adjacent to a bright state. Moreover, a previously unobserved ladder structure is identified. The new observations are analyzed in the context of a model based on fixed-nuclei adiabatic states, supported by full numerical simulations. Analytic calculations originating in the adiabatic model shed light on the nature and origins of the new findings.
ISSN:2331-8422
DOI:10.48550/arxiv.1809.04087