Maps of Nonadiabatic Coupling in Triatomic Hydrogen

Galster, U.; Müller, Ulrich; Helm, H.

doi:10.1103/physrevlett.92.073002

Phys. Rev. Lett.

2004

DOI: 10.1103/physrevlett.92.073002

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Maps of Nonadiabatic Coupling in Triatomic Hydrogen

U. Galster

Ulrich Müller

H. Helm

Abstract: We show in an experiment that dissociation of state-selected neutral H3* molecules into three ground-state hydrogen atoms reveals highly structured maps of correlation in the motion of the three atoms. These maps provide a direct view of the internal molecular couplings which initiate dissociation.

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Cited by 21 publications

(25 citation statements)

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“…In this Letter, we report the first direct measurement of the three-body dissociation dynamics of the two lowest 2s 2 A 0 1 and 2p 2 A 00 2 Rydberg states of H 3 and D 3 . Additionally, we present data on the 3p 2 E 0 state of H 3 consistent with recent work [17] that uses a different method of preparation. The Rydberg states of H 3 were produced by resonant and nonresonant charge exchange (CE) of a fast (12 keV) H 3 ion beam with Cs vapor:…”

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confidence: 66%

Three-Body Dissociation Dynamics of the Low-Lying Rydberg States ofH3andD3

et al. 2004

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The dynamics of the three-body dissociative charge exchange of fast (12 keV) H+3 and D+3 with Cs have been studied using multiparticle translational spectroscopy. The observed partitioning of product momenta was found to be state-specific and yields insights into the nuclear motion during dissociation for the three lowest-lying 2s 2A'1, 2p 2A''2, and 3p 2E' metastable Rydberg states of H3 and the 2s 2A'1 and 2p 2A''2 states for D3. These results provide direct empirical information on the nonadiabatic couplings that govern the three-body dissociation of the lowest-lying Rydberg states of H3 and D3.

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confidence: 66%

Three-Body Dissociation Dynamics of the Low-Lying Rydberg States ofH3andD3

et al. 2004

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“…Also three-body decays of excited states of small molecules are presently experimentally investigated in details [8]. The measured observables are the width and, particularly promising, the energy distributions of the three fragments after the decay [9].…”

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confidence: 99%

Efimov Effect in Nuclear Three-Body Resonance Decays

2006

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We investigate the effects of the nearly fulfilled Efimov conditions on the properties of three-body resonances. Using the hyper-spheric adiabatic expansion method we compute energy distributions of fragments in a three-body decay of a nuclear resonance. As a realistic example we investigate the 1 − state in the halo nucleus 11 Li within a three-body 9 Li + n + n model. Characteristic features appear as sharp peaks in the energy distributions. Their origin, as in the Efimov effect, is in the large two-body s-wave scattering lengths between the pairs of fragments. Introduction. The Efimov effect was introduced more than thirty years ago as an anomaly in a three-body system arising when at least two of the three two-body swave scattering lengths approach infinity [1]. Then an increasing number of three-body bound states appear close to the two-body threshold even if there are no two-body bound states. The effect is prohibited by the Coulomb potential while only diminished by higher angular momentum [2]. Although entirely possible in molecules [3] the effect is unlikely to appear in nuclei due to unfavorable mass ratio [4,5].Still there exists a number of nuclear systems, called halos [3], which are natural three-body systems -a core plus two neutrons -where the Efimov condition of at least two large scattering lengths is nearly fulfilled. Although the unfortunate combination of the heavy core and light neutrons prohibits the appearance of bound Efimov states in the discrete spectrum, they still may appear as peculiar structures in the continuum. Very little, however, is known theoretically about the Efimov states in the continuum.

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“…Similar decays occur in annihilation of a proton-antiproton pair from a Coulomb-like orbit into three mesons [2]. In molecular physics an example is decay of excited states of the H 3 molecule into three hydrogen atoms [3]. In nuclear physics there exists a large number of three-body decaying systems of disparate structures and decay mechanisms, e.g., various excited states of 6 He, 6 Li, 12 C, 17 Ne.…”

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confidence: 99%

Energy Distributions from Three-Body Decaying Many-Body Resonances

et al. 2007

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We compute energy distributions of three particles emerging from decaying many-body resonances. We reproduce the measured energy distributions from decays of two archetypal states chosen as the lowest 0 and 1 resonances in 12 C populated in decays. These states are dominated by sequential, through the 8 Be ground state, and direct decays, respectively. These decay mechanisms are reflected in the ''dynamic'' evolution from small, cluster or shell-model states, to large distances, where the coordinate or momentum space continuum wave functions are accurately computed.

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Maps of Nonadiabatic Coupling in Triatomic Hydrogen

Cited by 21 publications

References 19 publications

Three-Body Dissociation Dynamics of the Low-Lying Rydberg States ofH3andD3

Three-Body Dissociation Dynamics of the Low-Lying Rydberg States ofH3andD3

Efimov Effect in Nuclear Three-Body Resonance Decays

Energy Distributions from Three-Body Decaying Many-Body Resonances

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