Dipole Enhancement of Positron Binding to Molecules

Danielson, J. R.; Gosselin, J. J.; Surko, C. M.

doi:10.1103/physrevlett.104.233201

Cited by 91 publications

(101 citation statements)

References 30 publications

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“…(18) and (21) is zero. As expected, the semiclassical cross sections obtained by using the monotonic classical momentum distribution (20) do not have the oscillatory pattern of their quantum-mechanical counterparts. not so large, e.g., even for the most weakly bound species (CH 3 F, ε b = 0.3 meV) this occurs for n > 10.…”

Section: B Predictions For the Formation Of Positron Bound Statesmentioning

confidence: 55%

“…[70]) instead of Eq. (20). In this case, however, the cross section does not have a simple analytical form.…”

Section: B Semiclassical Approximationmentioning

confidence: 99%

“…(A.9b). Neglecting the interference term also allows one to derive the ionization cross section in the semiclassical approximation, by using the classical momentum distribution (20) instead of |F nl (p)| 2 p 2 for l n (cf. Sec.…”

Section: Appendix: Ps Ionization In Collisions With Atomsmentioning

confidence: 99%

“…A comparison of the measured cross section with the theoretical results derived in this paper should provide an estimate of the positron binding energy, which could be compared with existing high-quality predictions [12][13][14]. It would also be interesting to apply this method to molecules for which the binding energies are known from the resonant annihilation studies [15,[19][20][21][22]. Unlike positron-molecule annihilation which probes resonant, quasibound states, the molecular analog of reaction (2) should lead to population of the true positron-molecule bound states.…”

Section: Introductionmentioning

confidence: 99%

“…The downshift of a resonance relative to the vibrational excitation energy provided a measure of * aswann02@qub.ac.uk † d.cassidy@ucl.ac.uk ‡ a.deller@ucl.ac.uk § g.gribakin@qub.ac.uk the positron binding energy. This has enabled positron binding energies to be determined for over seventy molecules [19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

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Formation of positron-atom bound states in collisions between Rydberg Ps and neutral atoms

Swann¹,

Cassidy

Deller

et al. 2016

Phys. Rev. A

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Predicted twenty years ago, positron binding to neutral atoms has not yet been observed experimentally. A new scheme is proposed to detect positron-atom bound states by colliding Rydberg positronium (Ps) with neutral atoms. Estimates of the charge-transfer reaction cross section are obtained using the first Born approximation for a selection of neutral atom targets and a wide range of incident Ps energies and principal quantum numbers. We also estimate the corresponding Ps ionization cross section. The accuracy of the calculations is tested by comparison with earlier predictions for Ps charge transfer in collisions with hydrogen and antihydrogen. We describe an existing Rydberg Ps beam suitable for producing positron-atom bound states and estimate signal rates based on the calculated cross sections and realistic experimental parameters. We conclude that the proposed methodology is capable of producing such states and of testing theoretical predictions of their binding energies.

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Section: B Predictions For the Formation Of Positron Bound Statesmentioning

confidence: 55%

“…[70]) instead of Eq. (20). In this case, however, the cross section does not have a simple analytical form.…”

Section: B Semiclassical Approximationmentioning

confidence: 99%

Section: Appendix: Ps Ionization In Collisions With Atomsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Formation of positron-atom bound states in collisions between Rydberg Ps and neutral atoms

Swann¹,

Cassidy

Deller

et al. 2016

Phys. Rev. A

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Binding Matter with Antimatter: The Covalent Positron Bond

2018

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We report sufficient theoretical evidence of the energy stability of the e+⋅H22− molecule, formed by two H− anions and one positron. Analysis of the electronic and positronic densities of the latter compound undoubtedly points out the formation of a positronic covalent bond between the otherwise repelling hydride anions. The lower limit for the bonding energy of the e+⋅H22− molecule is 74 kJ mol−1 (0.77 eV), accounting for the zero‐point vibrational correction. The formation of a non electronic covalent bond is fundamentally distinct from positron attachment to stable molecules, as the latter process is characterized by a positron affinity, analogous to the electron affinity.

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Binding Matter with Antimatter: The Covalent Positron Bond

2018

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We report sufficient theoretical evidence of the energy stability of the e ⋅H molecule, formed by two H anions and one positron. Analysis of the electronic and positronic densities of the latter compound undoubtedly points out the formation of a positronic covalent bond between the otherwise repelling hydride anions. The lower limit for the bonding energy of the e ⋅H molecule is 74 kJ mol (0.77 eV), accounting for the zero-point vibrational correction. The formation of a non electronic covalent bond is fundamentally distinct from positron attachment to stable molecules, as the latter process is characterized by a positron affinity, analogous to the electron affinity.

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Dipole Enhancement of Positron Binding to Molecules

Cited by 91 publications

References 30 publications

Formation of positron-atom bound states in collisions between Rydberg Ps and neutral atoms

Formation of positron-atom bound states in collisions between Rydberg Ps and neutral atoms

Binding Matter with Antimatter: The Covalent Positron Bond

Binding Matter with Antimatter: The Covalent Positron Bond

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