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Jumping, Rotating, and Flapping: The Atomic-Scale Motion of Thiophene on Cu(111)

Lechner, BAJ, Sacchi, M, Jardine, AP, Hedgeland, H, Allison, W, Ellis, J, Jenkins, SJ, Dastoor, PC and Hinch, BJ (2013) Jumping, Rotating, and Flapping: The Atomic-Scale Motion of Thiophene on Cu(111) The Journal of Physical Chemistry Letters, 4 (11). pp. 1953-1958.

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Abstract

Self-assembled monolayers of sulfur-containing heterocycles and linear oligomers containing thiophene groups have been widely employed in organic electronic applications. Here, we investigate the dynamics of isolated thiophene molecules on Cu(111) by combining helium spin-echo (HeSE) spectroscopy with density functional theory calculations. We show that the thiophene/Cu(111) system displays a rich array of aperiodic dynamical phenomena that include jump diffusion between adjacent atop sites over a 59–62 meV barrier and activated rotation around a sulfur–copper anchor, two processes that have been observed previously for related systems. In addition, we present experimental evidence for a new, weakly activated process, the flapping of the molecular ring. Repulsive inter-adsorbate interactions and an exceptionally high friction coefficient of 5 ± 2 ps–1 are also observed. These experiments demonstrate the versatility of the HeSE technique, and the quantitative information extracted in a detailed analysis provides an ideal benchmark for state-of-the-art theoretical techniques including nonlocal adsorbate–substrate interactions.

Item Type: Article
Subjects : Chemistry
Authors :
NameEmailORCID
Lechner, BAJUNSPECIFIEDUNSPECIFIED
Sacchi, Mm.sacchi@surrey.ac.ukUNSPECIFIED
Jardine, APUNSPECIFIEDUNSPECIFIED
Hedgeland, HUNSPECIFIEDUNSPECIFIED
Allison, WUNSPECIFIEDUNSPECIFIED
Ellis, JUNSPECIFIEDUNSPECIFIED
Jenkins, SJUNSPECIFIEDUNSPECIFIED
Dastoor, PCUNSPECIFIEDUNSPECIFIED
Hinch, BJUNSPECIFIEDUNSPECIFIED
Date : 22 May 2013
Identification Number : 10.1021/jz400639c
Copyright Disclaimer : © 2013 American Chemical Society
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 13:56
Last Modified : 18 May 2017 12:53
URI: http://epubs.surrey.ac.uk/id/eprint/840856

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