title: Correlated electron and nuclear dynamics in strong field photoionization of H(2)(+).
abstract: We present a theoretical study of H(2)(+) ionization under strong IR femtosecond pulses by using a method designed to extract correlated (2D) photoelectron and proton kinetic energy spectra. The results show two distinct ionization mechanisms-tunnel and multiphoton ionization-in which electrons and nuclei do not share the energy from the field in the same way. Electrons produced in multiphoton ionization share part of their energy with the nuclei, an effect that shows up in the 2D spectra in the form of energy-conservation fringes similar to those observed in weak-field ionization of diatomic molecules. In contrast, tunneling electrons lead to fringes whose position does not depend on the proton kinetic energy. At high intensity, the two processes coexist and the 2D plots show a very rich behavior, suggesting that the correlation between electron and nuclear dynamics in strong field ionization is more complex than one would have anticipated.
authors.affiliation: Departamento de Química, Módulo 13, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
authors.forename: R E F
authors.initials: RE
authors.lastname: Silva
authors.affiliation: Centre des Lasers Intenses et Applications CNRS-CEA-Université Bordeaux I, 351 Cours de la Libération, Talence F-33405, France.
authors.forename: F
authors.initials: F
authors.lastname: Catoire
authors.affiliation: Departamento de Química, Módulo 13, Universidad Autónoma de Madrid, 28049 Madrid, Spain.
authors.forename: P
authors.initials: P
authors.lastname: Rivière
authors.affiliation: Centre des Lasers Intenses et Applications CNRS-CEA-Université Bordeaux I, 351 Cours de la Libération, Talence F-33405, France.
authors.forename: H
authors.initials: H
authors.lastname: Bachau
authors.affiliation: Departamento de Química, Módulo 13, Universidad Autónoma de Madrid, 28049 Madrid, Spain and Instituto Madrileño de Estudios Avanzados en Nanociencia, Cantoblanco, 28049 Madrid, Spain.
authors.forename: F
authors.initials: F
authors.lastname: Martín