Attosecond control in photoionization of hydrogen molecules

ABSTRACT: We report experiments where hydrogen molecules were dissociatively ionized by an attosecond pulse train in the presence of a near-infrared field. Fragment ion yields from distinguishable ionization channels oscillate with a period that is half the optical cycle of the IR field. For molecules aligned parallel to the laser polarization axis, the oscillations are reproduced in two-electron quantum simulations, and can be explained in terms of an interference between ionization pathways that involve different harmonic orders and a laser-induced coupling between the 1s g and 2p u states of the molecular ion. This leads to a situation where the ionization probability is sensitive to the instantaneous polarization of the molecule by the IR electric field and demonstrates that we have probed the IR-induced electron dynamics with attosecond pulses.

• Autores: Pérez Torres, Jhon Fredy; Siu, W.; Kelkensberg, F.; Morales, Felipe; Gademann, G.; Rouzée, A.; Johnsson, P.; Lucchini, M.; Calegary, F.; Sanz Vicario, José Luis; Martín García, Fernando; Vrakking, Marc. J. J.
• Tipo de recurso: Article of investigation
• Fecha de publicación: 2011
• Institución: Universidad de Antioquia
• Repositorio: Repositorio UdeA
• Idioma: eng
• OAI Identifier: oai:bibliotecadigital.udea.edu.co:10495/8638
• Acceso en línea: http://hdl.handle.net/10495/8638
• Palabra clave: Attosegundo; Fotoionización; Hidrógeneno; Moléculas
• Rights: openAccess
• License: Atribución-NoComercial-SinDerivadas 2.5 Colombia