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Studying Complex Surface Dynamical Systems Using Helium-3 Spin-Echo Spectroscopy

Part of the Springer Theses Book Series

DOI: 10.1007/978-3-319-01180-6

ISBN: 978-3-319-01179-0

Publisher: Springer International Publishing - Springer Journals

Apr 24, 2014

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Chapter 1Introduction

Lechner, Barbara A. J.

Pages: 1 –4

[Dynamical phenomena at the atomic scale influence and control a wide range of processes occurring on surfaces of solids. A fundamental understanding of the forces guiding surface motion is thus of utmost importance for the advancement of many fields of science and technology. Helium-3 spin-echo...
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Chapter 2The Helium-3 Spin-Echo Experiment

Lechner, Barbara A. J.

Pages: 5 –32

[Helium-3 spin-echo (HeSE) spectroscopy is a versatile tool that enables the investigation of surface dynamics such as adsorbate diffusion and vibration on atomic length- and pico- to nanosecond timescales. As a scattering technique, HeSE measures in momentum transfer space, which can make data...
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Chapter 3A New Helium Atom Scattering Apparatus

Lechner, Barbara A. J.

Pages: 33 –49

[To complement helium-3 spin-echo (HeSE) dynamics studies, a compact high-resolution helium atom scattering spectrometer has been developed. The instrument can be used for helium diffraction studies, thermal desorption measurements and uptake experiments. In addition, the new spectrometer aids in...
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Chapter 4An Improved High Intensity Supersonic Helium Beam Source

Lechner, Barbara A. J.

Pages: 51 –69

[The helium beam source is a key component of the helium-3 spin-echo spectrometer and determines the energy resolution of the experiment. Here, a new high-intensity supersonic beam source is presented, consisting of a new nozzle assembly and a new skimmer mount. The new nozzle achieves beam...
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Chapter 5The Dynamics of Cyclopentadienyl on Cu(111)

Lechner, Barbara A. J.

Pages: 71 –104

[The dissociative adsorption of cyclopentadiene (C5H6) on Cu(111) yields a cyclopentadienyl (Cp) species with strongly anionic characteristics. The Cp potential energy surface and frictional coupling to the substrate are determined from measurements of dynamics of the molecule by helium-3...
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Chapter 6Quantum Influences in the Diffusive Motion of Pyrrole on Cu(111)

Lechner, Barbara A. J.

Pages: 105 –141

[Pyrrole diffuses in channels on Cu(111), hopping between adjacent bridge sites over a barrier above hollow sites. Strong lateral interactions alter the lineshapes in helium-3 spin-echo measurements from a predicted double exponential toward an apparent single exponential decay. Molecular...
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Chapter 7The Atomic-Scale Motion of Thiophene on Cu(111)

Lechner, Barbara A. J.

Pages: 143 –168

[Self-assembled monolayers of sulfur-containing heterocycles and linear oligomers-containing thiophene groups are widely employed in organic electronic applications. Here, the surface dynamics of thiophene on Cu(111) are investigated by helium-3 spin-echo spectroscopy and molecular dynamics...
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Chapter 8Conclusions

Lechner, Barbara A. J.

Pages: 169 –172

[The present work was motivated by the desire to extend the field of application for helium-3 spin-echo spectroscopy from atomic and small molecular adsorbates to more complex surface dynamical systems. The main findings and conclusions are summarised here.]

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