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Computation of Atmospheric Concentrations of Molecular Clusters from ab initio Thermochemistry

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Published on: April 8, 2020

Universality in molecular halo clusters.

P Stipanović¹, L Vranješ Markić², I Bešlić³

¹Faculty of Science, University of Split, HR-21000 Split, Croatia.

Physical Review Letters

|January 3, 2015

Summary

This study explores quantum halo states in weakly bound molecules, finding universal behavior in the quantum halo regime. Different binding energies reveal distinct states like Borromean and tango trimers.

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Area of Science:

Nuclear physics
Quantum mechanics
Atomic physics

Background:

Quantum halo states are a phenomenon observed in weakly bound systems where particles extend far into the classically forbidden region.
Nuclei are traditional examples of quantum halos, but their interactions are complex.
Molecules composed of specific atoms offer a more controlled system to study these states.

Purpose of the Study:

To investigate the universality of quantum halo states in weakly bound dimers and trimers.
To test theoretical predictions of quantum halo universality using well-understood atomic and molecular systems.
To analyze the dependence of low-energy properties on interaction potentials.

Main Methods:

Variational Monte Carlo (VMC) method for precise calculations.
Diffusion Monte Carlo (DMC) method for accurate binding energy and size determination.
Model calculations to explore the impact of interaction potentials.

Main Results:

All studied molecular clusters exhibit universal behavior in the quantum halo regime for large scaled binding energies.
A clear separation between Borromean states and tango trimers is observed as scaled binding energy decreases.
Precise calculations of trimer size and binding energy were achieved.

Conclusions:

The universality of quantum halo states is confirmed in weakly bound molecular systems.
The study demonstrates that distinct states emerge based on scaled binding energy.
Molecular systems provide a valuable platform for studying quantum halo phenomena due to well-defined interactions.