The ground state of positronic copper

Ryzhikh, G. G.; Mitroy, Jim

doi:10.1088/0953-4075/31/19/028

Cited by 40 publications

(66 citation statements)

References 14 publications

(35 reference statements)

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“…The wave functions for e Li [11,12], e He 3 S e [13,14], e Na [11,15], e Be [11,16], e Cu [17,18], and e Mg [11,16] were all computed using the fixed core stochastic variational method (FCSVM) [11,19].…”

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confidence: 99%

Positron-Atom Complexes as Quantum Halo States

Mitroy

2005

Phys. Rev. Lett.

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The wave functions of a number of positron-atom complexes are analyzed and three of the systems, namely, e Be, e Na, and e He 3 S e , are seen to exhibit quantum halo structures with 45%-50% of their probability distribution lying in the large r classically forbidden region. The mean square distance between the large r fragments (e Be, Ps Na , Ps He ) for these systems range from 1.8 to 2.2 times larger than the square of the classical turning point, another indication of their halolike nature.

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confidence: 99%

Positron-Atom Complexes as Quantum Halo States

Mitroy

2005

Phys. Rev. Lett.

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“…[7] h Calculation by the SVMFC 2 method from Ref. [15,16] c The result of our earlier calculation by the CI+MBPT method (the relativistic configuration interaction plus many-body perturbation theory) from Ref. [7] as a recommended positron binding energy for Cu atom.…”

Section: Discussionmentioning

confidence: 99%

“…Since that time a number of theoretical papers were published but only few atomic systems were studied. The most accurate calculations were performed for eleven positron-atom systems involving Li, Na, Ag, Cu, Au, Be, Mg, Ca, Zn, Sr and Cd atoms [7][8][9][10][11][12][13][14][15][16][17][18]. Recent empirical fitted expression involving the polarizabilities (α), ionization potentials (I), and numbers of valence s electrons has also been based on the best calculations mentioned above [19].…”

Section: Introductionmentioning

confidence: 99%

Identification of atoms that can bind positrons

2014

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Calculations of the positron binding energies to all atoms in the periodic table are presented and atoms where the positron-atom binding actually exists are identified. The results of these calculations and accurate calculations of other authors (which existed for several atoms only) are used to evaluate recommended values of the positron binding energies to the ground states of atoms. We also present the recommended energies of the positron excited bound levels and resonances (due to the binding of positron to excited states of atoms) which can not emit positronium and have relatively narrow widths. Such resonances in positron annihilation and scattering may be used to measure the positron binding energy.

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“…The evidence for exotic systems that bind a positron suggests that positron annihilation is dominated by direct annihilation with the cluster electron [5,6,8]. The cluster annihilation rate G c represents a natural upper limit to the annihilation rate in an atomic or molecular environment since the positron can form a cluster with only one electron.…”

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confidence: 99%

“…The cluster annihilation rate G c represents a natural upper limit to the annihilation rate in an atomic or molecular environment since the positron can form a cluster with only one electron. While pickoff annihilation can slightly increase the annihilation rate, the annihilation rate is largely determined by the extent to which a Ps cluster forms part of the total wave function, and none of these positron binding systems have an annihilation rate (per positron) larger than 2.5 3 10 9 s 21 [5][6][7][8][9].…”

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confidence: 99%