The ground-state energy of helium and spin-polarised hydrogen clusters

Bešlić, Ivana (2010) The ground-state energy of helium and spin-polarised hydrogen clusters. Doctoral thesis, Faculty of Science > Department of Physics.

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Abstract

The ground-state of the helium and spin-polarized hydrogen quantum clusters is investigated in this work using Quantum Monte Carlo methods, as well as the spin-polarized tritium (T↓) liquid. For small mixed helium clusters consisting of up to eight helium atoms the ground-state energy and structure have been obtained. Stability of the 3He4 4He3 cluster, which was previously considered unstable, is predicted. It is confirmed that tritium trimer (T↓)3 is an example of Borromean state. For pure large spin-polarized tritium clusters consisting of up to 320 atoms the ground-state energy is obtained. Stability limits have been investigated for small mixed (T↓)n(D↓)m clusters, for m ≥ 2 i n + m ≤ 10. Especially, it has been shown that all clusters (T↓)ND↓ are stable for N ≥ 3. It is also shown that even 60 T↓ atoms are not enough to form stable cluster (T↓)60H↓. Equation of state, spinodal density, energy per particle at the equilibrium density, unit radius and surface tension of the T↓ liquid have been determined using results obtained in the simulations of liquid phase.

Item Type: Thesis (Doctoral thesis)
Keywords: helium ; ground-state energy ; quantum clusters ; spin-polarized hydrogen ; Variational and Diffusion Monte Carlo
Supervisor: Vranješ Markić, Leandra
Date: 15 July 2010
Number of Pages: 148
Subjects: NATURAL SCIENCES > Physics
Divisions: Faculty of Science > Department of Physics
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 22 Dec 2013 22:01
Last Modified: 11 Feb 2016 15:50
URI: http://digre.pmf.unizg.hr/id/eprint/54

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