Chamberlain, TW orcid.org/0000-0001-8100-6452, Biskupek, J, Skowron, ST et al. (4 more authors) (2015) Isotope Substitution Extends the Lifetime of Organic Molecules in Transmission Electron Microscopy. Small, 11 (5). pp. 622-629. ISSN 1613-6810
Abstract
Structural characterisation of individual molecules by high‐resolution transmission electron microscopy (HRTEM) is fundamentally limited by the element and electron energy‐specific interactions of the material with the high energy electron beam. Here, the key mechanisms controlling the interactions between the e‐beam and C–H bonds, present in all organic molecules, are examined, and the low atomic weight of hydrogen—resulting in its facile atomic displacement by the e‐beam—is identified as the principal cause of the instability of individual organic molecules. It is demonstrated theoretically and proven experimentally that exchanging all hydrogen atoms within molecules with the deuterium isotope, and therefore doubling the atomic weight of the lightest atoms in the structure, leads to a more than two‐fold increase in the stability of organic molecules in the e‐beam. Substitution of H for D significantly reduces the amount of kinetic energy transferred from the e‐beam to the atom (main factor contributing to stability) and also increases the barrier for bond dissociation, primarily due to the changes in the zero‐point energy of the C–D vibration (minor factor). The extended lifetime of coronene‐d12, used as a model molecule, enables more precise analysis of the inter‐molecular spacing and more accurate measurement of the molecular orientations.
Metadata
Item Type: | Article |
---|---|
Authors/Creators: |
|
Copyright, Publisher and Additional Information: | © 2014 The Authors. Published by WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited. (https://creativecommons.org/licenses/by/4.0/) |
Keywords: | carbon nanotubes; transmission electron microscopy; single‐molecule imaging; organic molecules; electron beam |
Dates: |
|
Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Chemistry (Leeds) > Inorganic Chemistry (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 21 Aug 2018 12:00 |
Last Modified: | 21 Aug 2018 12:00 |
Status: | Published |
Publisher: | Wiley |
Identification Number: | 10.1002/smll.201402081 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:134837 |
Commentary/Response Threads
- Chamberlain, TW, Biskupek, J, Skowron, ST, Bayliss, PA, Bichoutskaia, E, Kaiser, U and Khlobystov, AN Isotope Substitution Extends the Lifetime of Organic Molecules in Transmission Electron Microscopy. (deposited 21 Aug 2018 12:00) [Currently Displayed]