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Disentangling electron- and electric-field-induced ring-closing reactions in a diarylethene derivative on Ag(1 1 1)

Disentangling electron- and electric-field-induced ring-closing reactions in a diarylethene derivative on Ag(1 1 1)

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REECHT, Gaël, Christian LOTZE, Dmytro SYSOIEV, Thomas HUHN, Katharina J. FRANKE, 2017. Disentangling electron- and electric-field-induced ring-closing reactions in a diarylethene derivative on Ag(1 1 1). In: Journal of Physics / Condensed Matter. 29(29), 294001. ISSN 0953-8984. eISSN 1361-648X

@article{Reecht2017-07-26Disen-39549, title={Disentangling electron- and electric-field-induced ring-closing reactions in a diarylethene derivative on Ag(1 1 1)}, year={2017}, doi={10.1088/1361-648X/aa75c1}, number={29}, volume={29}, issn={0953-8984}, journal={Journal of Physics / Condensed Matter}, author={Reecht, Gaël and Lotze, Christian and Sysoiev, Dmytro and Huhn, Thomas and Franke, Katharina J.}, note={Article Number: 294001} }

2017-07-26 Lotze, Christian Huhn, Thomas eng Huhn, Thomas Reecht, Gaël 2017-07-11T08:30:42Z Disentangling electron- and electric-field-induced ring-closing reactions in a diarylethene derivative on Ag(1 1 1) Sysoiev, Dmytro Franke, Katharina J. Using scanning tunneling microscopy and spectroscopy we investigate the adsorption properties and ring-closing reaction of a diarylethene derivative (C5F-4Py) on a Ag(1 1 1) surface. We identify an electron-induced reaction mechanism, with a quantum yield varying from 10<sup>−14</sup>–10<sup>−9</sup> per electron upon variation of the bias voltage from 1–2 V. We ascribe the drastic increase in switching efficiency to a resonant enhancement upon tunneling through molecular orbitals. Additionally, we resolve the ring-closing reaction even in the absence of a current passing through the molecule. In this case the electric-field can modify the reaction barrier, leading to a finite switching probability at 4.8 K. A detailed analysis of the switching events shows that a simple plate-capacitor model for the tip-surface junction is insufficient to explain the distance dependence of the switching voltage. Instead, describing the tip as a sphere is in agreement with the findings. We resolve small differences in the adsorption configuration of the closed isomer, when comparing the electron- and field-induced switching product. Reecht, Gaël Franke, Katharina J. Lotze, Christian 2017-07-11T08:30:42Z Sysoiev, Dmytro

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