Publisher’s Note: Interplay between permanent dipole moments and polarizability in positron-molecule binding [Phys. Rev. A<b>85</b>, 022709 (2012)]

Danielson, J. R.; Jones, Adric; Gosselin, J. J.; Natisin, M. R.; Surko, C. M.

doi:10.1103/physreva.85.039907

Cited by 10 publications

(20 citation statements)

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“…In spite of the fact that most of the molecules had unphysical values of r 0 , it was found that taking the value of µ and r 0 for the molecule in each chemical family with the median dipole moment and varying the polarizability to match the other molecules in the family, gave reliable predictions of the binding energies for those molecules (with the exception of the methyl halides). The perturbative treatment was also in line with the observation made by experimentalists, that the dependence of the binding energy on the polarizability of the molecule is apparently almost linear [7]. Of course, a general increase in the binding energy with the polarizability could be expected, but there was no explanation for the linear dependence.…”

Section: Discussionsupporting

confidence: 85%

“…the dependence of ǫ b on α for molecules within the same chemical family (i.e., aldehydes, ketones, formates, acetates, nitriles) to be almost linear [7]. From (26) we can see that, for fixed µ and r 0 , ǫ (1) b scales linearly with α.…”

Section: Core Radii For Perturbative Inclusion Of Polarizationmentioning

confidence: 96%

“…Assuming that the radial and angular parts of the wave function are separately normalized to unity, this becomes For each of the molecules studied we made an initial estimate for the value of r 0 and adjusted it until the new binding energy ǫ b = ǫ table 4. Polarizabilities are taken from the CRC Handbook [37], with the exceptions of propyl formate and cyclopentanone, for which the polarizabilities have been estimated by Danielson et al [7].…”

Section: Core Radii For Perturbative Inclusion Of Polarizationmentioning

confidence: 99%

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Effect of dipole polarizability on positron binding by strongly polar molecules

Gribakin

Swann

2015

J. Phys. B: At. Mol. Opt. Phys.

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Abstract.A model for positron binding to polar molecules is considered by combining the dipole potential outside the molecule with a strongly repulsive core of a given radius. Using existing experimental data on binding energies leads to unphysically small core radii for all of the molecules studied. This suggests that electron-positron correlations neglected in the simple model play a large role in determining the binding energy. We account for these by including the polarization potential via perturbation theory and non-perturbatively. The perturbative model makes reliable predictions of binding energies for a range of polar organic molecules and hydrogen cyanide. The model also agrees with the linear dependence of the binding energies on the polarizability inferred from the experimental data [Danielson et al 2009 J. Phys. B: At. Mol. Opt. Phys. 42 235203]. The effective core radii, however, remain unphysically small for most molecules. Treating molecular polarization nonperturbatively leads to physically meaningful core radii for all of the molecules studied and enables even more accurate predictions of binding energies to be made for nearly all of the molecules considered.

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Section: Discussionsupporting

confidence: 85%

Section: Core Radii For Perturbative Inclusion Of Polarizationmentioning

confidence: 96%

Section: Core Radii For Perturbative Inclusion Of Polarizationmentioning

confidence: 99%

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Effect of dipole polarizability on positron binding by strongly polar molecules

Gribakin

Swann

2015

J. Phys. B: At. Mol. Opt. Phys.

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“…Hence, by observing the resonances, the positron binding energy ε b = |ǫ 0 | can be found. In this way binding energies for over sixty polyatomic species have been determined [22][23][24][25] by measuring positron annihilation using a high-resolution, tunable, trap-based positron beam [26]. In our previous paper [13] we suggested that one can search for a similar effect in atoms.…”

Section: Introductionmentioning

confidence: 99%

Relativistic linearized coupled-cluster single-double calculations of positron-atom bound states

et al. 2012

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Relativistic coupled-cluster single-double approximation is used to calculate positron-atom bound states. The method is tested on closed-shell atoms such as Be, Mg, Ca, Zn, Cd, and Hg where a number of accurate calculations is available. It is then used to calculate positron binding energies for a range of open-shell transition metal atoms from Sc to Cu, from Y to Pd, and from Lu to Pt. These systems possess Feshbach resonances, which can be used to search for positron-atom binding experimentally through resonant annihilation or scattering.

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“…Hence, by observing the resonances, the positron binding energy can be found. In this way, binding energies for over 60 polyatomic species have been determined [26][27][28][29] by measuring positron annihilation using a high-resolution, tunable, trap-based positron beam [30].…”

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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Publisher’s Note: Interplay between permanent dipole moments and polarizability in positron-molecule binding [Phys. Rev. A85, 022709 (2012)]

Abstract: Publisher's Note: Interplay between permanent dipole moments and polarizability in positron-molecule binding [Phys. Rev. A 85, 022709 (2012)]

Cited by 10 publications

References 0 publications

Effect of dipole polarizability on positron binding by strongly polar molecules

Effect of dipole polarizability on positron binding by strongly polar molecules

Relativistic linearized coupled-cluster single-double calculations of positron-atom bound states

Identification of atoms that can bind positrons

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