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

Download or read book Studying Complex Surface Dynamical Systems Using Helium-3 Spin-Echo Spectroscopy written by Barbara A. J. Lechner and published by Springer Science & Business. This book was released on 2014-04-23 with total page 183 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.