A Combined Monte Carlo and Huckel Theory Simulation of Orientational Ordering in C-60 Assemblies

Leaf, Jeremy and Stannard, Andrew and Jarvis, Samuel P. and Moriarty, Philip and Dunn, Janette L. (2016) A Combined Monte Carlo and Huckel Theory Simulation of Orientational Ordering in C-60 Assemblies. The Journal of Physical Chemistry C, 120 (15). pp. 8139-8147. ISSN 1932-7447

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Abstract

Orientational ordering of C-60 molecules within monolayer and multilayer islands is a regularly observed phenomenon in scanning tunneling microscopy (STM) studies. Here we simulate the orientational ordering seen in STM images via a novel combination of Monte Carlo and Huckel theory methods and compare to experimental data. A measure of the repulsive interaction energy between two adjacent C-60 molecules is precalculated by estimating and processing the electron density distribution between them. Many combinations of molecular orientations are considered to encompass all the details of the molecular orbitals. Precalculated intermolecular interaction energies are inputted into a simulated C-60 island. Here, the center position of each molecule is fixed, but the molecules are allowed to rotate freely around their centers. A minimum in the total island free energy is sought by sequentially picking molecules at random and rotating them according to their neighbors. Results show significant correlation with experimentally observed features in both mono- and multilayered islands on a variety of different substrates.

Item Type: Journal Article
Journal or Publication Title: The Journal of Physical Chemistry C
Uncontrolled Keywords: /dk/atira/pure/subjectarea/asjc/2500/2504
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 84599
Deposited By: ep_importer_pure
Deposited On: 07 Feb 2017 10:02
Refereed?: Yes
Published?: Published
Last Modified: 30 Sep 2019 19:54
URI: https://eprints.lancs.ac.uk/id/eprint/84599

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