Abstract
Besides mass and charge, electrons also possess a spin. By detecting the direction of the spin of photoemitted electrons one can gain important information about the photoexcitation process and the properties of the sample under investigation. There are two modes in which a PE experiment can produce a spin polarization of the photoemitted electron. One can use unpolarized light to excite polarized electrons in a sample, which is a good way to investigate, e.g., magnetic materials, and one can employ circularly polarized light to excite transitions between states that are split by spin-orbit interactions, thereby obtaining spin-polarized electrons in the final state. This second method is useful for producing beams of polarized electrons, which can then be used for other experiments. Unfortunately, the measurement of spiry polarization is a non-trivial problem and there are relatively few laboratories that can employ this very elegant method. Therefore, we shall simply outline the principles of such experiments whilst referring the reader to the excellent reviews [10.1–10.6] for further details.
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Hüfner, S. (2003). Spin-Polarized Photoelectron Spectroscopy. In: Photoelectron Spectroscopy. Advanced Texts in Physics. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-09280-4_10
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