6,272 research outputs found

    One-Electron Ionization of Multielectron Systems in Strong Nonresonant Laser Fields

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    We present a novel approach to calculating strong field ionization dynamics of multielectron molecular targets. Adopting a multielectron wavefunction ansatz based on field-free ab initio neutral and ionic multielectron states, a set of coupled time-dependent single-particle Schroedinger equations describing the neutral amplitude and continuum electron are constructed. These equations, amenable to direct numerical solution or further analytical treatment, allow one to study multielectron effects during strong field ionization, recollision, and high harmonic generation. We apply the method to strong field ionization of CO_2, and suggest the importance of intermediate core excitation to explain previous failure of analytical models to reproduce experimental ionization yields for this molecule.Comment: 25 pages, 6 figure

    Ultralong-Range Rydberg Molecules in a Divalent-Atomic System

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    We report the creation of ultralong-range Sr2_2 molecules comprising one ground-state 5s25s^2 1S0^1S_0 atom and one atom in a 5sns5sns 3S1^3S_1 Rydberg state for nn ranging from 29 to 36. Molecules are created in a trapped ultracold atomic gas using two-photon excitation near resonant with the 5s5p5s5p 3P1^3P_1 intermediate state, and their formation is detected through ground-state atom loss from the trap. The observed molecular binding energies are fit with the aid of first-order perturbation theory that utilizes a Fermi pseudopotential with effective ss-wave and pp-wave scattering lengths to describe the interaction between an excited Rydberg electron and a ground-state Sr atom.Comment: 5 pages, 2 figure

    Lifetimes of ultralong-range strontium Rydberg molecules in a dense BEC

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    The lifetimes and decay channels of ultralong-range Rydberg molecules created in a dense BEC are examined by monitoring the time evolution of the Rydberg population using field ionization. Studies of molecules with values of principal quantum number, nn, in the range n=49n=49 to n=72n=72 that contain tens to hundreds of ground state atoms within the Rydberg electron orbit show that their presence leads to marked changes in the field ionization characteristics. The Rydberg molecules have lifetimes of ∼1−5 μ\sim1-5\,\mus, their destruction being attributed to two main processes: formation of Sr2+^+_2 ions through associative ionization, and dissociation induced through LL-changing collisions. The observed loss rates are consistent with a reaction model that emphasizes the interaction between the Rydberg core ion and its nearest neighbor ground-state atom. The measured lifetimes place strict limits on the time scales over which studies involving Rydberg species in cold, dense atomic gases can be undertaken and limit the coherence times for such measurements.Comment: 9 pages, 8 figure

    A study of packaging and shipping procedures for small electroexplosive devices Final report, May 1, 1966 - Aug. 1, 1967

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    Packaging, shipping, and shielding procedures for electroexplosive device
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