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Wyświetlanie 1-15 z 113
Tytuł:
An Attempt to Produce the Implanted $\text{}^{22}$Na Source for Positron Spectrometry
Autorzy:
Latuszyński, A.
Yushkevich, Yu. V.
Bystrov, V. A.
Misak, R.
Wawryszczuk, J.
Goworek, T.
Powiązania:
https://bibliotekanauki.pl/articles/1929102.pdf
Data publikacji:
1993-03
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
28.60.+s
29.25.Rm
Opis:
Preliminary results of $\text{}^{22}$Na implantation into the metal foils in order to produce the positron source for annihilation experiments are presented.
Źródło:
Acta Physica Polonica A; 1993, 83, 3; 345-348
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hyperfine Structure Constants in the 10$\text{}^{2}$D$\text{}_{3}\text{}_{/}\text{}_{2}$ and 11$\text{}^{2}$D$\text{}_{3}\text{}_{/}\text{}_{2}$ States of $\text{}^{85}$Rb
Autorzy:
Głódź, M.
Kraińska-Miszczak, M.
Powiązania:
https://bibliotekanauki.pl/articles/1928264.pdf
Data publikacji:
1993-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
35.10.Fk
32.80.Rm
Opis:
The magnetic-dipole interaction constants A and the electric-quadrupole interaction constants B of two n$\text{}^{2}$D$\text{}_{3}\text{}_{/}\text{}_{2}$ states of $\text{}^{85}$Rb were measured by the quantum beat method. The results are - for n = 10: |A| = 0.393(8) MHz, |B| = 0.141(13) MHz, for n = 11: |A| = 0.283(6) MHz, |B| = 0.100(11) MHz, and positive ratio B/A for both states.
Źródło:
Acta Physica Polonica A; 1993, 83, 2; 161-165
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:
High Order Harmonic Generation and Atomic Stabilization in Ultra-Intense Laser Pulses
Autorzy:
Maquet, A.
Millack, T.
Véniard, V.
Powiązania:
https://bibliotekanauki.pl/articles/1931517.pdf
Data publikacji:
1994-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
42.65.Ky
32.80.Rm
Opis:
We present results of recent numerical simulations on the non-linear response of a single-electron atom submitted to an intense laser pulse. We address both the questions of the light scattered by the atom and the possible stabilization against ionization. One of the results of our simulations is the the presence of hyper-Raman lines in the high-order harmonic spectra. We suggest that these lines could be a signature of atomic stabilization.
Źródło:
Acta Physica Polonica A; 1994, 86, 1; 191-199
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laser-Matter Interaction with Intense Short Laser Pulses
Autorzy:
Lompré, L. A.
Powiązania:
https://bibliotekanauki.pl/articles/1931493.pdf
Data publikacji:
1994-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.80.Fb
32.80.Rm
Opis:
Laser-matter interaction in rare gases (He, Ne, Ar and Xe) has been investigated using a 1 ps Nd-glass laser pulse at 1053 nm with intensities between 10$\text{}^{13}$ to 10$\text{}^{18}$ W/cm$\text{}^{2}$. Three aspects of the interaction have been studied: the creation of multiply charged ions, the energy of the ejected electron and the propagation in an underdense plasma. At the maximum laser intensity, all electrons of the outer shell are removed, except in Ne for which charge states up to 7+ are observed. Comparison of experimental data with Ammosov et al. tunneling model shows a very good agreement, indicating that ionization with a 1 ps pulse in the near infrared light mainly occurs in tunneling regime. Electrons created in a low-density medium with energies up to 5 keV have been detected. These energies are far above the energy acquired during the ionization process, indicating that at high laser intensities electron energy is governed by ponderomotive force. Finally, the study of the propagation of an intense laser pulse in an underdense plasma shows that it is not possible to obtain simultaneously high laser intensity (10$\text{}^{17}$-10$\text{}^{18}$ W/cm$\text{}^{2}$) and high electron density (10$\text{}^{19}$-10$\text{}^{20}$ cm$\text{}^{-3}$). Best conditions for solving this problem will be discussed.
Źródło:
Acta Physica Polonica A; 1994, 86, 1; 135-150
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radiation Amplification near an Autoionizing State
Autorzy:
Lambropoulos, P.
Zhang, Jian
Van Enk, S. J.
Powiązania:
https://bibliotekanauki.pl/articles/1931394.pdf
Data publikacji:
1994-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.80.Rm
32.80.Wr
32.70.Jz
Opis:
We present an internally consistent theory of amplification near the minimum of autoionizing states with quantitative application to calcium. We have included a completely specified three-photon pumping and we find certain unusual aspects of the system. We find conditions under which the system remains in a steady state, although being coupled to the continuum. For incoherent pumping we obtain quantitative results for the gain. Our results and their extensions are also discussed in the context of present-day experimental possibilities.
Źródło:
Acta Physica Polonica A; 1994, 86, 1; 61-69
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strong-Field Phenomena in Atoms - Quasiclassical Approach
Autorzy:
Fedorov, M. V.
Powiązania:
https://bibliotekanauki.pl/articles/1931525.pdf
Data publikacji:
1994-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.80.Fb
32.80.Rm
Opis:
A quasiclassical (WKB) approach is used to construct a theory of atomic transitions induced by a strong light field. This approach is used to find the "Coulomb-Volkov" solutions of the Schrödinger equation in which both the Coulomb and light fields are taken into account. These solutions are shown to be applicable in a region of low light frequencies, low electron energies and angular momenta. The found solutions are used to describe two kinds of processes: strong-field photoionization from highly excited (Rydberg) atomic levels, and field-assisted electron-ion scattering. In the photoionization problem the strong-field complex quasi-energies of an atom are found. A problem of the strong-field stabilization of an atom, as well as the expected behavior of the ionization time in its dependence on the light field strength are discussed.
Źródło:
Acta Physica Polonica A; 1994, 86, 1; 235-243
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
U$\text{}_{P}$, 3U$\text{}_{P}$, 11U$\text{}_{P}$: Above-Threshold Ionization Revisited
Autorzy:
Yang, Baorui
Schafer, K. J.
Walker, B.
Kulander, K. C.
Dimauro, L. F.
Agostini, P.
Powiązania:
https://bibliotekanauki.pl/articles/1931385.pdf
Data publikacji:
1994-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
32.80.Fb
31.90.+s
32.80.Rm
Opis:
Angular distributions of very high energy photoelectrons from Xe and Kr, excited by a 50 ps, 1054 um laser, are presented. In Xe strong, narrow structures 45° off the polarization axis appear on above-threshold ionization peaks within a limited energy range centered around 9U$\text{}_{P}$, where U$\text{}_{P}$ is the intensity-dependent ponderomotive energy. Under the same conditions the effect is much weaker in krypton. These structures are discussed using a very simple classical model as well as sophisticated single active electron calculations and the Keldysh-Faisal-Reiss theory. We conclude these structures are the result of single-electron dynamics involving rescattering of a tunneling component of the continuum wave function.
Źródło:
Acta Physica Polonica A; 1994, 86, 1; 41-50
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Comparative Study of Si-2p Core-Excitation Spectra of SiX_{4} Molecules (with X = H, D, F, Cl, Br)
Autorzy:
Püttner, R.
Domke, M.
Kaindl, G.
Powiązania:
https://bibliotekanauki.pl/articles/1963398.pdf
Data publikacji:
1997-05
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
33.20.Rm
33.15.Dj
33.20.Tp
Opis:
Highly-resolved photoabsorption spectraof SiX$\text{}_{4}$ molecules (with X = H, D, F, Cl, Br), recorded by photoionization in the region of the Si-2p absorption thresholds, are presented. Vibrational fine structure could be resolved in all cases, allowing a derivation of vibrational energies and intra-molecular distances of the core-excited molecules from Franck-Condon fits. In case of the heavier ligand atoms, spectral features arising from thermally-excited vibrational states of the electronic ground state were observed. The results obtained for the various ligand atoms are compared with each other and are discussed in the context of the equivalent-cores approximation.
Źródło:
Acta Physica Polonica A; 1997, 91, 5; 865-870
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:
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:
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
Wyświetlanie 1-15 z 113

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