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This work was supported by the European COST Action AttoChem No. CA18222, the French National Research Agency in the frame of the Investments for the Future Programme IdEx Bordeaux, LAPHIA (Program No. ANR-10-IDEX-03-02), and the Spanish Ministry of Science and Innovation MICINN through Project No. PDI2019105458RB-I00, the Severo Ochoa Programme for Centres of Excellence in R&D (Program No. SEV-2016-0686) and the Maria de Maeztu Programme for Units of Excellence in R&D (Program No. CEX2018-000805-M). The authors thank the University of Bordeaux for providing access to the Mesocentre de Calcul Intensif Aquitain and theMareNostrum in the Barcelona Supercomputing Center through the Spanish Supercomputing Network and in the Centro Computacion Cientifica at UAM.

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Asymmetric electron angular distributions in H-2 induced by intense ultrashort soft-x-ray laser pulses

Publicado en:Physical review A: atomic, molecular and optical physics. 105 (3): 33104- - 2022-03-01 105(3), DOI: 10.1103/physreva.105.033104

Autores: Sopena, Arturo; Catoire, Fabrice; Palacios, Alicia; Martin, Fernando; Bachau, Henri;

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Resumen

X-ray free-electron-laser facilities generate nowadays ultrashort pulses with intensities as high as 1020 W/cm(2). The interaction of these light sources with atoms and molecules thus opens the way to still unexplored phenomena, where the commonly employed dipole approximation breaks down, and nonlinear excitation and ionization, e.g., Raman and Compton-like processes, come into play. We have developed theoretical tools to describe the interaction of intense attosecond soft-x-ray pulses with the hydrogen molecule in the photon energy ranging from 0.5 to 1.6 keV. We solve the time-dependent Schrodinger equation including both dipole and nondipole terms to obtain single-ionization photoelectron spectra differential in both energy and angle of the ejected electron. The signature of stimulated Compton scattering is clearly seen in the photoelectron spectra just above the ionization threshold, where nondipole effects manifest. Remarkably, the interference between dipole-and nondipole-induced quantum paths leads to a significant asymmetry of the photoelectron angular distributions. We show that this asymmetry strongly depends on the relative direction of the light polarization and propagation vectors with respect to the molecular orientation.

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