Fizyka – to proste!

Author(s): A. Gazibegović-Busuladžić, D. B. Milošević, W. Becker, B. Bergues, H. Hultgren, and I. Yu. Kiyan
We present experimental and theoretical results on photodetachment of Br^{-} and F^{-} in a strong infrared laser field. The observed photoelectron spectra of Br^{-} exhibit a high-energy plateau along the laser polarization direction, which is identified as being due to the rescattering effect. The…
[Phys. Rev. Lett. 104, 103004] Published Fri Mar 12, 2010

Author(s): M. Swoboda, T. Fordell, K. Klünder, J. M. Dahlström, M. Miranda, C. Buth, K. J. Schafer, J. Mauritsson, A. L’Huillier, and M. Gisselbrecht
We study resonant two-color two-photon ionization of helium via the 1s3p ^{1} P _{1} state. The first color is the 15th harmonic of a tunable Ti:sapphire laser, while the second color is the fundamental laser radiation. Our method uses phase-locked high-order harmonics to determine the phase of the…

[Phys. Rev. Lett. 104, 103003] Published Fri Mar 12, 2010

Author(s): Hebin Li, Vladimir A. Sautenkov, Yuri V. Rostovtsev, Michael M. Kash, Petr M. Anisimov, George R. Welch, and Marlan O. Scully
We present an experimental and theoretical study of the carrier-envelope phase effects on population transfer between two bound atomic states interacting with intense ultrashort pulses. Radio frequency pulses are used to transfer population among the ground state hyperfine levels in rubidium atoms. …
[Phys. Rev. Lett. 104, 103001] Published Mon Mar 08, 2010

Author(s): F. Mauger, C. Chandre, and T. Uzer
We examine the nature and statistical properties of electron-electron collisions in the recollision process in a strong laser field. The separation of the double ionization yield into sequential and nonsequential components leads to a bell-shaped curve for the nonsequential probability and a monoton…
[Phys. Rev. Lett. 104, 043005] Published Fri Jan 29, 2010

Author(s): Jan Conrad Baggesen and Lars Bojer Madsen
We study the influence of polarization effects in streaking by combined atto- and femtosecond pulses. The polarization-induced terms alter the streaking spectrum. The conventional streaking spectrum, which maps to the vector potential of the femtosecond pulse, is modified by a contribution following…
[Phys. Rev. Lett. 104, 043602] Published Thu Jan 28, 2010

Author(s): K. P. Singh, F. He, P. Ranitovic, W. Cao, S. De, D. Ray, S. Chen, U. Thumm, A. Becker, M. M. Murnane, H. C. Kapteyn, I. V. Litvinyuk, and C. L. Cocke
We demonstrate an experimental control of electron localization in deuterium molecular ions created and dissociated by the combined action of an attosecond pulse train and a many-cycle infrared (IR) pulse. The attosecond pulse train is synthesized using both even and odd high order harmonics of the …
[Phys. Rev. Lett. 104, 023001] Published Thu Jan 14, 2010

Author(s): A. Palacios, T. N. Rescigno, and C. W. McCurdy
A two-color two-photon atomic double ionization experiment using subfemtosecond uv pulses can be designed such that the sequential two-color process dominates and one electron is ejected by each pulse. Nonetheless, ab initio calculations show that, for sufficiently short pulses, a prominent interfe…
[Phys. Rev. Lett. 103, 253001] Published Mon Dec 14, 2009

Author(s): Kenta Kitano, Hirokazu Hasegawa, and Yasuhiro Ohshima
We theoretically show and experimentally verify that a pair of linearly polarized intense femtosecond pulses can create molecular ensembles with oriented rotational angular momentum on an ultrafast (∼ps) time scale, when the delay and the mutual polarization between them are appropriately arranged…
[Phys. Rev. Lett. 103, 223002] Published Tue Nov 24, 2009

Author(s): Manuel Kremer, Bettina Fischer, Bernold Feuerstein, Vitor L. B. de Jesus, Vandana Sharma, Christian Hofrichter, Artem Rudenko, Uwe Thumm, Claus Dieter Schröter, Robert Moshammer, and Joachim Ullrich
Fully differential data for H_{2} dissociation in ultrashort (6 fs, 760 nm), linearly polarized, intense (0.44  PW/cm^{2} ) laser pulses with a stabilized carrier-envelope phase (CEP) were recorded with a reaction microscope. Depending on the CEP, the molecular orientation, and the kinetic ene…
[Phys. Rev. Lett. 103, 213003] Published Fri Nov 20, 2009