Abstract
In this chapter, we introduce the efficacy of photoemission and inverse photoemission in determining the interactions of adsorbates with a substrate, with an emphasis on simple adsorbates on various metallic and oxide surfaces. We cover symmetry and selection rules, and how hybridization, bonding, and molecular orientation affect x-ray photoemission (XPS), angle resolved photoemission (ARPES), and angle resolved inverse photoemission (ARIPES). The application of ARPES and ARIPES in the determination of the orientation of molecular adsorbates and the wave vector dependence of the adsorbate molecular orbitals is addressed. We also address some of the difficulties associated with photoemission data interpretation as they relate to initial states and screened and unscreened final states, surface-to-bulk core level shifts, and core level satellites. This chapter isintended to help those new to photoemission spectroscopy with a basic understanding of the photoemission phenomenon and the associated intricacies that will be encountered in an experimental setting.
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Acknowledgements
We would like to thank the Department of Energy for supporting this research, specifically; DOE Grant DE-FG02-07ER15842. We would also like to thank Professor Peter A. Dowben for his long discussions about the physics of photoemission and his guidance with our interpretations. Prof. Dowben is truly a source of inspiration and we are eternally grateful.
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Yost, A.J., Evans, P.E., Tanabe, I., Hao, G., Gilbert, S., Komesu, T. (2020). Integrated Experimental Methods for the Investigation of the Electronic Structure of Molecules on Surfaces. In: Rocca, M., Rahman, T.S., Vattuone, L. (eds) Springer Handbook of Surface Science. Springer Handbooks. Springer, Cham. https://doi.org/10.1007/978-3-030-46906-1_11
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