Fizyka – to proste!

Author(s): C. B. Madsen, M. Abu-samha, and L. B. Madsen
We present a generic approach for treating the effect of nuclear motion in high-order harmonic generation from polyatomic molecules. Our procedure relies on a separation of nuclear and electron dynamics where we account for the electronic part using the Lewenstein model and nuclear motion enters as …
[Phys. Rev. A 81, 043413] Published Tue Apr 20, 2010

Author(s): C. Figueira de Morisson Faria and B. B. Augstein
We investigate quantum interference effects in high-order harmonic generation in N_{2} and N_{2} ^{+} beyond the single-active-orbital approximation, with particular emphasis on the role of σ and π orbitals in the overall spectra. In the former case, we consider a simplified multielectron wave fun…
[Phys. Rev. A 81, 043409] Published Thu Apr 15, 2010

Author(s): Alexei N. Grum-Grzhimailo, Brant Abeln, Klaus Bartschat, Daniel Weflen, and Timothy Urness
We have used the matrix iteration method of Nurhuda and Faisal [Phys. Rev. A 60, 3125 (1999)] to treat ionization of atomic hydrogen by a strong laser pulse. After testing our predictions against a variety of previous calculations, we present ejected-electron spectra as well as angular distributions…
[Phys. Rev. A 81, 043408] Published Wed Apr 14, 2010

Author(s): D. F. Ye and J. Liu
We investigate the strong-field double ionization using a semiclassical model, in which the recollision-induced excitation-tunneling (RIET) effect has been taken into account with the Wentzel-Kramers-Brillouin (WKB) approach. When the laser intensity is below the recollision threshold, we find that …
[Phys. Rev. A 81, 043402] Published Thu Apr 08, 2010

Author(s): S. Y. Liu, Y. Ogi, T. Fuji, K. Nishizawa, T. Horio, T. Mizuno, H. Kohguchi, M. Nagasono, T. Togashi, K. Tono, M. Yabashi, Y. Senba, H. Ohashi, H. Kimura, T. Ishikawa, and T. Suzuki
A time-resolved photoelectron imaging using a femtosecond ultraviolet (UV) laser and a vacuum UV free-electron laser is presented. Ultrafast internal conversion and intersystem crossing in pyrazine in a supersonic molecular beam were clearly observed in the time profiles of photoioinzation intensity…

[Phys. Rev. A 81, 031403] Published Wed Mar 31, 2010

Author(s): Song-Feng Zhao, Cheng Jin, Anh-Thu Le, T. F. Jiang, and C. D. Lin
In the strong field molecular tunneling ionization theory of Tong [Phys. Rev. A 66, 033402 (2002)], the ionization rate depends on the asymptotic wave function of the molecular orbital from which the electron is removed. The orbital wave functions obtained from standard quantum chemistry packages in…
[Phys. Rev. A 81, 033423] Published Mon Mar 29, 2010

Author(s): Candong Liu, Zhinan Zeng, Pengfei Wei, Peng Liu, Ruxin Li, and Zhizhan Xu
The electron-nuclear dynamics of one-dimensional H_{2} ^{+} molecular high harmonic generation is investigated by numerical integration of the non-Born-Oppenheimer time-dependent Schrödinger equation. It is found that the nuclear motion and electron ionization are more significant for the longer wa…
[Phys. Rev. A 81, 033426] Published Mon Mar 29, 2010

Author(s): Oleg I. Tolstikhin, Toru Morishita, and Shinichi Watanabe
As a first step toward the adiabatic theory of ionization of atoms by intense few-cycle laser pulses, here we consider the simplest one-dimensional zero-range-potential model. The theory for this model is developed. This theory rests on a single parameter ε giving a ratio of the atomic and laser ti…
[Phys. Rev. A 81, 033415] Published Mon Mar 22, 2010

Author(s): M. Abu-samha and L. B. Madsen
Single-active-electron potentials are computed for selected molecules, and molecular wave functions with the correct asymptotic behavior are produced. Asymptotic expansion coefficients are extracted from the wave functions and used to compute alignment-dependent ionization yields from molecular tunn…
[Phys. Rev. A 81, 033416] Published Mon Mar 22, 2010

Author(s): Gordon A. Gallup and Ilya I. Fabrikant
We apply a previously developed semiclassical complex time method to the calculation of tunneling ionization of several diatomic molecules and CO_{2} . We investigate the presence or absence of the molecular suppression effect by calculating ionization rates of N_{2} versus Ar, O_{2} versus Xe, F_{2…
[Phys. Rev. A 81, 033417] Published Mon Mar 22, 2010