Single molecule thermal rotation and diffusion: Acetylene on CU(001)

L. J. Lauhon; W. Ho

doi:10.1063/1.479863

Single molecule thermal rotation and diffusion: Acetylene on CU(001)

L. J. Lauhon^*, W. Ho

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

60 Scopus citations

Abstract

A variable temperature scanning tunneling microscope was used to directly observe the thermally induced rotation of a single acetylene molecule between two equivalent orientations on Cu(001) above 68 K. Measurements of the rotation rate as a function of temperature yielded an energy barrier of 169±3 meV and a preexponential factor of 10^11.8±0.2 s^-1. Thermal diffusion of individual acetylene molecules was monitored above 178 K by single molecule tracking. A diffusion barrier of 0.53±0.01 eV and a preexponential factor of 10^13.6±0.2 s^-1 were determined by measuring the hopping rate as a function of temperature.

Original language	English (US)
Pages (from-to)	5633-5636
Number of pages	4
Journal	Journal of Chemical Physics
Volume	111
Issue number	13
DOIs	https://doi.org/10.1063/1.479863
State	Published - Oct 1 1999

ASJC Scopus subject areas

General Physics and Astronomy
Physical and Theoretical Chemistry

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abstract = "A variable temperature scanning tunneling microscope was used to directly observe the thermally induced rotation of a single acetylene molecule between two equivalent orientations on Cu(001) above 68 K. Measurements of the rotation rate as a function of temperature yielded an energy barrier of 169±3 meV and a preexponential factor of 1011.8±0.2 s-1. Thermal diffusion of individual acetylene molecules was monitored above 178 K by single molecule tracking. A diffusion barrier of 0.53±0.01 eV and a preexponential factor of 1013.6±0.2 s-1 were determined by measuring the hopping rate as a function of temperature.",

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N2 - A variable temperature scanning tunneling microscope was used to directly observe the thermally induced rotation of a single acetylene molecule between two equivalent orientations on Cu(001) above 68 K. Measurements of the rotation rate as a function of temperature yielded an energy barrier of 169±3 meV and a preexponential factor of 1011.8±0.2 s-1. Thermal diffusion of individual acetylene molecules was monitored above 178 K by single molecule tracking. A diffusion barrier of 0.53±0.01 eV and a preexponential factor of 1013.6±0.2 s-1 were determined by measuring the hopping rate as a function of temperature.

AB - A variable temperature scanning tunneling microscope was used to directly observe the thermally induced rotation of a single acetylene molecule between two equivalent orientations on Cu(001) above 68 K. Measurements of the rotation rate as a function of temperature yielded an energy barrier of 169±3 meV and a preexponential factor of 1011.8±0.2 s-1. Thermal diffusion of individual acetylene molecules was monitored above 178 K by single molecule tracking. A diffusion barrier of 0.53±0.01 eV and a preexponential factor of 1013.6±0.2 s-1 were determined by measuring the hopping rate as a function of temperature.

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Single molecule thermal rotation and diffusion: Acetylene on CU(001)

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