title: Scaling of wave-packet dynamics in an intense midinfrared field.
abstract: A theoretical investigation is presented that examines the wavelength scaling from near-visible (0.8 micro m) to midinfrared (2 micro m) of the photoelectron distribution and high harmonics generated by a "single" atom in an intense electromagnetic field. The calculations use a numerical solution of the time-dependent Schrödinger equation (TDSE) in argon and the strong-field approximation in helium. The scaling of electron energies (lambda2), harmonic cutoff (lambda2), and attochirp (lambda -1) agree with classical mechanics, but it is found that, surprisingly, the harmonic yield follows a lambda -(5-6) scaling at constant intensity. In addition, the TDSE results reveal an unexpected contribution from higher-order returns of the rescattering electron wave packet.
authors.affiliation: Department of Physics, The Ohio State University, Columbus, OH 43210, USA.
authors.forename: J
authors.initials: J
authors.lastname: Tate
authors.forename: T
authors.initials: T
authors.lastname: Auguste
authors.forename: H G
authors.initials: HG
authors.lastname: Muller
authors.forename: P
authors.initials: P
authors.lastname: Salières
authors.forename: P
authors.initials: P
authors.lastname: Agostini
authors.forename: L F
authors.initials: LF
authors.lastname: DiMauro