A comprehensive theoretical study of positron binding and annihilation properties of hydrogen bonded binary molecular clusters

Yoshida, Daisuke; Kita, Yukiumi; Shimazaki, Tomomi; Tachikawa, Masanori

doi:10.1039/d2cp03813g

Phys. Chem. Chem. Phys.

2022

DOI: 10.1039/d2cp03813g

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A comprehensive theoretical study of positron binding and annihilation properties of hydrogen bonded binary molecular clusters

Daisuke Yoshida

Yukiumi Kita

Tomomi Shimazaki

et al.

Abstract: We studied the positron binding and annihilation of the hydrogen bonded binary molecular clusters containing small inorganic molecules such as water, hydrogen fluoride, ammonia, hydrogen sulfide, hydrogen chloride, and phosphine,...

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2024

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Cited by 2 publications

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Does Positron Attachment Take Place in Water Solution?

Bergami,

Charry,

Reyes

et al. 2024

J. Phys. Chem. B

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We performed a computational study of positron attachment to hydrated amino acids, namely glycine, alanine, and proline in the zwitterionic form. We combined the sequential quantum mechanics/ molecular mechanics (s-QM/MM) method with various levels of any particle molecular orbital (APMO) calculations. Consistent with previous studies, our calculations indicate the formation of energetically stable states for the isolated and microsolvated amino acids, in which the positron localizes around the carboxylate group. However, for the larger clusters, composed of 7 to 40 water molecules, hydrogen bonding between the solute and solvent molecules disfavors positron attachment to the amino acids, giving rise to surface states in which the positron is located around the water−vacuum interface. The analysis of positron binding energies, positronic orbitals, radial probability distributions, and annihilation rates consistently pointed out the change from positron− solute to positron−solvent states. Even with the inclusion of an electrostatic embedding around the aggregates, the positrons did not localize around the solute. Positron attachment to molecules in the gas phase is a well-established fact. The existence of hydrated positronic molecules could also be expected from the analogy with transient anion states, which are believed to participate in radiation damage. Our results indicate that positron attachment to hydrated biomolecules, even to zwitterions with negatively charged carboxylated groups, would not take place. For the larger clusters, in which positron−water interactions are favored, the calculations indicate an unexpectedly large contribution of the core orbitals to the annihilation rates, between 15 and 20%. Finally, we explored correlations between positron binding energies (PBEs) and dipole moments, as well as annihilation rates and PBEs, consistent with previous studies for smaller clusters.

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Does Positron Attachment Take Place in Water Solution?

Bergami,

Charry,

Reyes

et al. 2024

J. Phys. Chem. B

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Multi-component configuration interaction study for positron–molecule compounds: benchmark calculations of positron binding in polar and non-polar molecules

Yoshida,

Tachikawa

2024

Eur. Phys. J. D

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A comprehensive theoretical study of positron binding and annihilation properties of hydrogen bonded binary molecular clusters

Abstract: We studied the positron binding and annihilation of the hydrogen bonded binary molecular clusters containing small inorganic molecules such as water, hydrogen fluoride, ammonia, hydrogen sulfide, hydrogen chloride, and phosphine,...

Cited by 2 publications

References 60 publications

Does Positron Attachment Take Place in Water Solution?

Does Positron Attachment Take Place in Water Solution?

Multi-component configuration interaction study for positron–molecule compounds: benchmark calculations of positron binding in polar and non-polar molecules

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