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    Wyświetlanie 1-9 z 9
    Tytuł:
    The Spatial Region of Photoionization in a Strong Laser Field
    Autorzy:
    Bauer, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812038.pdf
    Data publikacji:
    2008-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.80.Rm
    42.50.Hz
    Opis:
    In the framework of the Keldysh-Faisal-Reiss theory in the velocity gauge we investigate the magnitude of the space region, where photoionization in a strong laser field takes place. We find substantial differences between the short-range and the long-range (Coulomb) potentials, and between linear and circular polarizations of incident radiation. It appears that only for the initial state in the Coulomb potential the region of space, where ionization is held, expands significantly with increasing intensity for a typical optical frequency and non-relativistic but strong circularly polarized laser field. As a result of our considerations, we suggest to modify the idea of Reiss and Krainov of a certain simple Coulomb correction to the Volkov wave function. We show that photoionization rate calculated for the H(1s) atom, using our approach, is in better agreement with other theoretical results for moderately strong circularly polarized laser field.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 4; 739-750
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Suppression of Excited-Atom Two-Photon Ionization due to Rabi Oscillations between the Excited and a Lower State
    Autorzy:
    Grudka, A.
    Parzyński, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/2024023.pdf
    Data publikacji:
    2001-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.80.Rm
    42.50.Hz
    Opis:
    Optical resonance between the initially occupied excited atomic state and some lower lying state is shown to be a suppressor of two-photon ionization from this excited state via near-threshold Rydberg states because of Rabi oscillations between the resonantly coupled states.
    Źródło:
    Acta Physica Polonica A; 2001, 99, 2; 257-265
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quantum-classical Correspondence in Intense Laser Field-atom Interactions
    Autorzy:
    Bowden, C. M.
    Pethel, S. D.
    Rosenberger, A. T.
    Sung, C. C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968504.pdf
    Data publikacji:
    1998-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.80.Rm
    42.50.Hz
    Opis:
    High-field ionization suppression in a classical Kepler ensemble is discussed in terms of optimization with respect to pulse turn-on rate as well as pre-pulse preparation. It is argued that high-field ionization suppression is best understood in terms of reduced probability of ionization for pulsed fields, whereas for a quasi-steady field, high-field ionization suppression implies a reduced ionization rate at higher intensities. The classical ensemble is used to calculate the high-field ionization rate of a one-dimensional atomic model using a Gaussian short-range potential and the results are compared with high-frequency Floquet theory results recently reported by other authors. Better than qualitative agreement is found and the results are compared and discussed in terms of quantum superposition and classical interference. Finally, high-field ionization suppression is discussed in relation to statistical relative stability of classical orbits of the ensemble, and classical interference for both short- and long-range potentials. Correspondence with quantum superposition is interpreted in relation to quantum-classical correspondence.
    Źródło:
    Acta Physica Polonica A; 1998, 93, 1; 31-43
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Polarization Dependence of Microwave "ionization" of Excited Hydrogen Atoms
    Autorzy:
    Koch, P. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968532.pdf
    Data publikacji:
    1998-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.80.Rm
    05.45.+b
    42.50.Hz
    Opis:
    After a brief review of the ionization of excited hydrogen atoms by a linearly polarized field, we discuss experimental results for the polarization dependence of this process. Experiments at ω/2π = 9.904 GHz used two different ranges of principal quantum number n$\text{}_{0}$ between 29 and 98. At low scaled frequencies, Ω ≲ 0.1, ionization data for certain narrow ranges of n$\text{}_{0}$ exhibit striking sensitivity to fields with elliptical polarization not too far from circular polarization. Classical calculations reproduce this behavior and show it to be the result of 2ω driving terms that appear when the Hamiltonian is transformed to a frame rotating at ω. It shows how higher-dimensional dynamics can influence the ionization and be used to control it when the polarization departs from linear or circular polarization. At higher scaled frequencies, 0.6 ≲ Ω$\text{}_{0}$ ≲ 1.4, near the onset of ionization circularly and elliptically polarized data show surprising similarities with linearly polarized data in a parameter regime where the ionization dynamics is dominated by the influence of the pendulumlike resonance zone centered at scaled frequency n$\text{}_{0}^{3}$ω ≡ Ω$\text{}_{0}$ = 1. The stabilizing influence of this zone can be understood classically, but nonclassical stability associated with quantal separatrix states at its edge is a semiclassical effect.
    Źródło:
    Acta Physica Polonica A; 1998, 93, 1; 105-133
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Atoms and Molecules in a Strong Laser Field
    Autorzy:
    Busuladžić, M.
    Gazibegović-Busuladžić, A.
    Hasović, E.
    Milošević, D.
    Becker, W.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791210.pdf
    Data publikacji:
    2009-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    33.80.Rv
    32.80.Rm
    42.50.Hz
    Opis:
    We investigate high-order above-threshold ionization of diatomic molecules and their companion atoms by linearly polarized strong laser field using improved molecular (atomic) strong-field approximation. The most noticeable feature of the molecular spectra is the existence of minima that are absent in atomic case. We have derived an analytical formula for their position which is independent of the molecular symmetry.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 4; 516-518
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Correlation? What Correlation?
    Autorzy:
    Eberly, J. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1931502.pdf
    Data publikacji:
    1994-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    32.80.Fb
    32.80.Rm
    42.50.Hz
    Opis:
    We describe recent developments in the theory of multi-electron atoms in strong radiation fields, with particular focus on the degree of e-e correlation accompanying a laser-atom interaction.
    Źródło:
    Acta Physica Polonica A; 1994, 86, 1; 151-157
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chaos Assisted Tunneling and Nonspreading Wave Packets
    Autorzy:
    Zakrzewski, J.
    Delande, D.
    Buchleitner, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1968540.pdf
    Data publikacji:
    1998-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    05.45.+b
    32.80.Rm
    42.50.Hz
    Opis:
    Consider an initial state lying on a primary resonance island. The state may tunnel into the chaotic sea surrounding it and further escape to infinity via chaotic diffusion. Properties of transport in such a situation are studied on an exemplary system - the hydrogen atom driven by microwaves. We show that the combination of tunneling followed by chaotic diffusion leads to peculiar large scale fluctuations of the AC Stark shift and ionization rates. An appropriate random matrix model describes accurately these statistical properties.
    Źródło:
    Acta Physica Polonica A; 1998, 93, 1; 179-186
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dynamics of Argon Clusters in an Intense Laser Pulse: Bloch-Like Hydrodynamic Model
    Autorzy:
    Rusek, M.
    Orłowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2038167.pdf
    Data publikacji:
    2004-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    36.40.-c
    32.80.Rm
    42.50.Hz
    07.05.Tp
    Opis:
    The dynamics of small (<55 atoms) argon clusters ionized by an intense, infrared, femtosecond laser pulse is studied using a Bloch-like hydrodynamic model. Evolution of both free electrons and ions formed in the cluster explosion process is examined. Oscillations of the electron cloud in a rare-gas atomic cluster are described as a motion of a fluid obeying Bloch-like hydrodynamic equations. Our theoretical approach includes all possible ionization mechanisms: tunnel (or field) ionization both by an external laser field, and by an internal field due to the space-charge distribution inside the cluster, as well as electron-impact (or collisional) ionization. The results of our simulations are compared both with experimental findings and with predictions of other theoretical models.
    Źródło:
    Acta Physica Polonica A; 2004, 106, 1; 3-12
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Explosion of Atom Clusters in a Free-Electron Intense Laser Pulse
    Autorzy:
    Rusek, M.
    Orłowski, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/2037285.pdf
    Data publikacji:
    2004-05
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    36.40.-c
    32.80.Rm
    42.50.Hz
    07.05.Tp
    Opis:
    The explosion of rare-gas atomic clusters induced by short, intense X-ray pulses generated by a free-electron laser is studied. A numerical approach for an explicitly time-dependent description of small to medium size clusters in 3D is developed within the Thomas-Fermi model. Such an approach, though strongly simplified in comparison to fully quantum-mechanical schemes, is nevertheless expected to yield a qualitatively correct description of the electronic and ionic dynamics of these systems, at a much lower computational cost.
    Źródło:
    Acta Physica Polonica A; 2004, 105, 5; 425-436
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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