Electronic structure of MgO studied by angle-resolved ultraviolet photoelectron spectroscopy
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On the analysis of photo-electron spectra
2015, Annals of PhysicsCitation Excerpt :Photo-Electron Spectroscopy (PES) has grown over decades to one of the major tools of analysis of the structure and dynamics of atoms, molecules or solids [1–3]. With the increasing availability and versatility of light sources, studies of PES are now found in all areas of molecular physics, in atoms and simple molecules [4] as well as in more complex systems such as clusters [5] or organic molecules [6]. The archetypal case is that a system is subject to a laser field with moderate intensity and sufficiently high frequency, such that all valence electron states can be ionized in one stroke.
Polarization dependent hard X-ray photoemission experiments for solids: Efficiency and limits for unraveling the orbital character of the valence band
2015, Journal of Electron Spectroscopy and Related PhenomenaCitation Excerpt :Indeed, looking at the tables [14,15], the ratio of the subshell photoionization cross section of the Ni 4s relative to that of the Ni 3d increases from 0.12 at hν = 1486.6 eV, to 0.99 at hν = 5 keV, and to 3.61 at hν = 10 keV, meaning that the contribution of the Ni 4s to the spectrum is negligible in XPS and that it becomes significant in the HAXPES experiment. The finding that HAXPES is much more sensitive to valence s orbitals is consistent with earlier reports and has been used to identify the partial density of states of the s orbital in semiconductors and metals [28–33]. This result in fact shows that HAXPES unveils an important part of the chemical bonding between the Ni and the O in the formation of NiO, namely the hybridization between the Ni 4s conduction band and the O 2p valence band.
Energy band alignment of MgO (111)/ZnO (0002) heterojunction determined by X-ray photoelectron spectroscopy
2012, Solid State CommunicationsCitation Excerpt :The estimated internal electric filed was acceptable by comparing the magnitude of its value in ZnO/(Mg, Zn)O structures with previous report both theoretically [22] and experimentally [23]. Moreover, the electron affinities of ZnO and MgO were determined to be 1.3 eV [24] and 4.6 eV [25], respectively, from which a CBO value of 3.3 eV and VBO value of 1.16 eV were estimated. They are comparable to our results experimentally obtained by XPS.
Dynamics of clusters and molecules in contact with an environment
2010, Physics ReportsBulk-sensitive spectroscopic studies on noncentrosymmetric superconducting system of Mg-Ir-B
2009, Physica C: Superconductivity and its Applications