共查询到20条相似文献,搜索用时 15 毫秒
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We investigate the interaction of a standing-wave light field with the beam of two-level atoms moving in the Bragg regime.
The atomic beam consists of two different isotopes and the density is sufficiently small so that at most one atom is inside
the cavity at any time. The experimental setup is such that both the isotopes have the same momenta. The momentum transfer
between the atoms and photons in the process essentially effects the center-of-mass motion of the atoms, thus separating the
isotopes in different directions after specific interaction times. 相似文献
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V. I. Yakushin 《Russian Physics Journal》1973,16(9):1293-1294
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Müller D Cornell EA Prevedelli M Schwindt PD Zozulya A Anderson DZ 《Optics letters》2000,25(18):1382-1384
A laser-cooled neutral-atom beam from a low-velocity intense source is split into two beams while it is guided by a magnetic-field potential. We generate our multimode beam-splitter potential with two current-carrying wires upon a glass substrate combined with an external transverse bias field. The atoms are guided around curves and a beam-splitter region within a 10-cm guide length. We achieve a maximum integrated flux of 1.5x10(5)atoms/s with a current density of 5x10(4)amp/cm (2) in the 100-microm -diameter wires. The initial beam can be split into two beams with a 50/50 splitting ratio. 相似文献
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Linear analysis of a three-dimensional rectangular Cerenkov maser with a sheet electron beam
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A linear theory of a rectangular Cerenkov maser (RCM) with a sheet electron beam is developed by using the field-match method. Based on the three-dimensional beam-wave interaction model proposed in this paper, a hybrid-mode dispersion equation and its analytical solution are derived for the RCM. Through numerical calculations, the effects of the beam-grating gap, beam thickness, current density, beam voltage and waveguide width on the linear growth rate are analysed. Moreover, the performance difference between the RCM with the closed transverse boundary and that with the upper open boundary is compared. The results show that the closed RCM model can avoid the effect of RF radiation on beam-wave interaction, which is more rational for practical applications. 相似文献
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Linear theory of a dielectric-loaded rectangular Cerenkov maser with a sheet electron beam
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A three-dimensional model of a dielectric-loaded rectangular Cerenkov maser with a sheet electron beam for the beam-wave interaction is proposed.Based on this model,the hybrid-mode dispersion equation is derived with the Borgnis potential function by using the field-matching method.Its approximate solution is obtained under the assumption of a dilute electron beam.By using the Ansoft high frequency structural simulator(HFSS) code,the electromagnetic field distribution in the interaction structure is given.Through numerical calculations,the effects of beam thickness,beam and dielectric-layer gap distance,beam voltage,and current density on the resonant growth rate are analysed in detail. 相似文献
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P.K. Haff 《Physics letters. A》1977,62(5):301-302
Average s-wave cross-sections appropriate for liquid hydrogen temperatures are calculated with the aid of an in-coming wave boundary condition for the muon transfer process μ-p + Z → (μ-Z)1 + p on heavy atoms. The surface-correlated nature of the heavy atom X-rays is emphasized. 相似文献
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The appearance of atomic squeezing in a system of three-level atoms placed in a two-mode cavity, is analyzed. The effects of effective dipole-dipole interactions between atoms are discussed. It is found that these interactions washed-out the squeezing, while the increase in the mean number of photons, of the initial coherent state, moderates this effect significatively. 相似文献
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Excitation cross sections at slow collisions of hydrogen and sodium atoms are calculated based on two sets of quantum-chemical
data. The results of calculations permit one to conclude that, upon the excitation of the sodium atom from the ground state
in the region of near-threshold energies, the cross sections are highly sensitive to matrix nonadiabaticity elements. In addition,
the matrix nonadiabaticity element was varied for the transition 3s → 3p of the sodium atom at fixed collision energy near the reaction threshold. It was found that the variation leads to a significant
change in the excitation cross section 3s → 3p, and the range of the energetic dependence of this cross section was determined. 相似文献
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O. V. Miklukho A. Yu. Kisselev G. M. Amalsky V. A. Andreev O. Ya. Fedorov G. E. Gavrilov A. A. Izotov L. M. Kochenda A. I. Kovalev D. V. Novinsky A. N. Prokofiev A. V. Shvedchikov V. Yu. Trautman S. I. Trush A. A. Zhdanov 《Physics of Atomic Nuclei》2010,73(6):927-936
The polarization correlation parameter C nn in the elastic proton-proton scattering was for the first time measured with a high statistical accuracy at 1 GeV using an unpolarized proton beam incident on an unpolarized proton target. Both outgoing protons from the reaction were detected in coincidence by means of a two-arm focusing magnetic spectrometer installed at nonsymmetric angles corresponding to the center-of-mass scattering angle Θcm = 62.25°. The correlation parameter C nn , as well as polarizations P 1 and P 2 of the secondary protons, were measured by means of multiwire proportional chamber polarimeters placed at the focal planes of each spectrometer arm. The obtained data are compared with the predictions of the phase-shift analysis. The connection with the experiment on C nn and polarization measurements in the (p, 2p) reaction on 4He and other light nuclei in similar kinematics is discussed 相似文献
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The formation of an antiprotonic hydrogen atom $\{ p\bar p\} $ (protonium) in the ground state and in excited states (nlm) in collisions of 1-to 250-keV antiprotons with hydrogen atoms is considered theoretically. Partial cross sections (both differential and integrated ones) for this reaction are calculated for various values of n, l, and m up to n~100; cross sections summed over l and m are also obtained. Statistical (polarization) tensors of the orbital angular momentum of protonium atoms are evaluated. Corrections due to strong proton-antiproton interaction in the protonium ground (1s) state are analyzed. 相似文献
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P. A. Butrimov O. Yu. Anan’ina A. S. Yanovskii 《Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques》2010,4(3):476-479
The dependence of the binding energy and the activation energy of adsorption of hydrogen atoms on the number of previously
adsorbed particles and their position—on one or both sides of a cluster, on nearest or distant neighbors (carbon atoms)—is
investigated by quantum-chemical modeling. A hypothesis of the formation of adsorption sites (islands) on graphene at the
initial stage of its saturation by hydrogen is discussed. 相似文献