Polarization of light/synchrotron radiation

Due to the mixed polarization of monochromatized synchrotron radiation, the angle dependence of photoelectron emission as expressed in equ. (1.30) for completely linearly polarized light requires modification. This is considered in detail in Section 9.1, but the implication for the corresponding appropriate experimental set-up is treated in the next section. 

Weber, T., Estermann, M. A., Burgi, H. B., Structural complexity of a polar perhydrotriphenylene inclusion compound brought to light by synchrotron radiation. Acta Crystallogr. Sect. B-Struct. Commun. 2001, 57, 579-590. 

Another important aspect of electron spectrometry of free atoms using synchrotron radiation concerns the polarization of the monochromatized light. 

From these relations it can be seen that only circularly polarized light (nonvanishing S3) allows the determination of all spin-polarization parameters, , rj, C linearly polarized (St = 1) or unpolarized light (Sj = S3 = 0) yields only tj. Therefore, a complete experiment for 5p3/2 photoionization in xenon, where a, / , t], are needed, relies on the availability of circularly polarized synchrotron radiation. 

The measurements were carried out using polarized-light from synchrotron radiation. The angle-resolved UPS spectra were recorded for specific directions of photon incidence, photon polarization, and electron exit, chosen in order to resolve the momentum dependence of the 7t-electron energy bands which could be observed in this experiment. Details are available elsewhere63. The UPS results are analysed not only with the help of the valence effective Hamiltonian (VEH) method, but also with the help of new quantum-chemical calculations based upon the excitation model method64. The full VEH band structure is shown in Fig. 7.32. 

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