Attosecond transient-absorption spectroscopy of polar molecules

Abstract

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.

arXiv comment13 pages, 6 figures

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• Edge-state and bulk-like laser-induced correlation effects in high-harmonic generation from a linear chain
• Attosecond Transient Absorption Spectroscopy without Inversion Symmetry
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