Laser-induced distortion of structural interferences in high harmonic generation

We study theoretically the two-center interferences occurring in high harmonic generation from diatomic molecules. By solving the time-dependent Schroedinger equation, either numerically or with the molecular strong-field approximation, we show that the electron dynamics results in a strong spectral...

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Bibliographic Details
Published in:arXiv.org 2017-07
Main Authors: Risoud, F, Lévêque, C, Labeye, M, Caillat, J, Maquet, A, Salières, P, Taïeb, R, Shaaran, T
Format: Article
Language:English
Subjects:
Diatomic molecules
Dipoles
Harmonic generations
Schrodinger equation
Time dependence
Online Access:Get full text
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Summary:We study theoretically the two-center interferences occurring in high harmonic generation from diatomic molecules. By solving the time-dependent Schroedinger equation, either numerically or with the molecular strong-field approximation, we show that the electron dynamics results in a strong spectral smoothing of the interference, depending on the value and sign of the driving laser field at recombination. Strikingly, the associated phase-jumps are in opposite directions for the short and long trajectories. In these conditions, the harmonic emission is not simply proportional to the recombination dipole any more. This has important consequences in high harmonic spectroscopy, e.g., for accessing the molecular-frame recombination dipole in amplitude and phase.
ISSN:2331-8422