Phys. Rev. Lett. 86, 1397 (2001)
Krzysztof Góral, Mariusz Gajda, and Kazimierz Rzążewski
We analyze the coherent multimode dynamics of a system of coupled atomic and molecular Bose gases. Starting from an atomic Bose-Einstein condensate with a small thermal component, we observe a complete depletion of the atomic and molecular condensate modes on a short time scale due to a significant population of excited states. Giant coherent oscillations between the two condensates for typical parameters are almost completely suppressed. Our results cast serious doubts on the common use of the 2-mode model for the description of coupled ultracold atomic-molecular systems and should be considered when planning future experiments with ultracold molecules.
May 26, 2000
Cluster explosion in an intense laser pulse: Thomas-Fermi model
Physical Review A 63, 013203 (2001)
Marian Rusek, Herve Lagadec and Thomas Blenski
A refined three-dimensional version of the time-dependent Thomas-Fermi model is used to qualitatively study the explosion of rare-gas atomic clusters in an intense laser field. Clusters as large as 55 atoms are exposed to a strong subpicosecond laser pulse. A stepwise character of the explosion is observed in which atomic shells are expelled sequentially. The role of “hot” electron dynamics in the explosion process is also investigated via initial temperature effects. Contrary to previous opinions it seems that the so-called hydrodynamic explosion scenario is important for most energetic ions coming from the outermost shells only.
Marian Rusek, Herve Lagadec and Thomas Blenski
A refined three-dimensional version of the time-dependent Thomas-Fermi model is used to qualitatively study the explosion of rare-gas atomic clusters in an intense laser field. Clusters as large as 55 atoms are exposed to a strong subpicosecond laser pulse. A stepwise character of the explosion is observed in which atomic shells are expelled sequentially. The role of “hot” electron dynamics in the explosion process is also investigated via initial temperature effects. Contrary to previous opinions it seems that the so-called hydrodynamic explosion scenario is important for most energetic ions coming from the outermost shells only.
May 18, 2000
New concept of waveguide for inverse free electron laser accelerator
Władysław Żakowicz
A segmented waveguide formed by a periodic system of pairs of wedge prisms with a gap between them is proposed. The prisms are made of single-crystal sapphire for which the refraction index ν<1 for CO2 laser radiation (λ=10.6 μm). The attenuation of 0.1 db/m can be estimated for a 5 mm diameter radiation beam for which the Rayleigh distance is approximately 1 m. The gap between adjacent prisms can be useful in FEL-like applications.
Nucl. Instr. Meth. Phys. Res. A 445, 313 (2000)
A segmented waveguide formed by a periodic system of pairs of wedge prisms with a gap between them is proposed. The prisms are made of single-crystal sapphire for which the refraction index ν<1 for CO2 laser radiation (λ=10.6 μm). The attenuation of 0.1 db/m can be estimated for a 5 mm diameter radiation beam for which the Rayleigh distance is approximately 1 m. The gap between adjacent prisms can be useful in FEL-like applications.
Nucl. Instr. Meth. Phys. Res. A 445, 313 (2000)
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