Studying Complex Surface Dynamical Systems Using Helium-3 Spin-Echo Spectroscopy
Chemical reactions and growth processes on surfaces depend on the diffusion and re-orientation of the adsorbate molecules. A fundamental understanding of the forces guiding surface motion is thus of utmost importance for the advancement of many fields of science and technology. To date, our understanding of the principles underlying surface dynamics remains extremely limited, due to the difficulties involved in measuring these processes experimentally. The helium-3 spin-echo (HeSE) technique is uniquely capable of probing such surface dynamical phenomena. The present thesis extends the field of application of HeSE from atomic and small molecular systems to more complex systems. Improvements to the supersonic helium beam source, a key component of the spectrometer, as well as a detailed investigation of a range of five-membered aromatic adsorbate species are presented. The thesis provides a comprehensive description of many aspects of the HeSE method - instrumentation, measurement and data analysis - and as such offers a valuable introduction for newcomers to the field.
What people are saying - Write a review
We haven't found any reviews in the usual places.
6 Quantum Influences in the Diffusive Motion of Pyrrole on Cu111
7 The AtomicScale Motion of Thiophene on Cu111
Other editions - View all
A.P. Jardine activation energy adsorbate adsorption adsorption behaviour Alexandrowicz Allison analytical model Arrhenius azimuth beam energy bond Bravais lattice bridge sites Chem components crystal cyclopentadiene cyclopentene density functional theory dephasing rate detector dft calculations diffraction dipole electron Ellis energy difference experimental data exponential function fast decay fcc and hcp ferrocene friction coefficient Gennes hcp sites Hedgeland helium atom scattering helium-3 helium-3 spin-echo HeSE experiments HeSE measurements HeSE spectrometer intensity intracell diffusion investigation isfs lateral interactions lineshapes mass spectrometer mbar MD simulations metal surfaces metallocenes MiniScat molecular dynamics molecules momentum transfer nexafs non-Bravais lattice nozzle temperature observed panel particle peak phonons Phys polarisation pyrrole rotation sample scattering chamber Sect signal single exponential skimmer skimmer mount source chamber spectroscopy specular attenuation specular helium structure substrate surface dynamics thermal desorption thiophene timescales top sites uptake curve vacuum vibrational