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

• Κύριος συγγραφέας: Lechner, Barbara A. J. (Συγγραφέας)
• Συγγραφή απο Οργανισμό/Αρχή: SpringerLink (Online service)
• Μορφή: Ηλεκτρονική πηγή Ηλ. βιβλίο
• Γλώσσα: English
• Έκδοση: Cham : Springer International Publishing : Imprint: Springer, 2014.
• Σειρά: Springer Theses, Recognizing Outstanding Ph.D. Research,
• Θέματα: Physics.; Physical chemistry.; Atoms.; Surfaces (Physics).; Interfaces (Physical sciences).; Thin films.; Physical measurements.; Measurement.; Materials > Surfaces.; Surface and Interface Science, Thin Films.; Physical Chemistry.; Atomic, Molecular, Optical and Plasma Physics.; Measurement Science and Instrumentation.; Surfaces and Interfaces, Thin Films.

 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. 

 Motivation -- The helium-3 spin-echo experiment -- A new helium atom scattering apparatus -- An improved high intensity supersonic helium beam source -- The dynamics of cyclopentadienyl on Cu(111) -- Quantum influences in the diffusive motion of pyrrole on Cu(111) -- The diffusive motion of thiophene on Cu(111) -- Conclusions.