Stabat Mater

Giovanni Battista\u27s Pergolesi\u27s Stabat Mater, or the Sorrows of Mary, for a two-part women\u27s chorus (soprano and alto parts) with piano accompaniment.https://ecommons.udayton.edu/imri_sheetmusic/1081/thumbnail.jp

Real-time monitoring of stress evolution during thin film growth by in situ substrate curvature measurement

Strain engineering is the art of inducing controlled lattice distortions in a material to modify specific physicochemical properties. Strain engineering is applied for basic fundamental studies of physics and chemistry of solids but also for device fabrication through the development of materials with new functionalities. Thin films are one of the most important tools for strain engineering. Thin films can in fact develop large strain due to the crystalline constrains at the interface with the substrate and/or as the result of specific morphological features that can be selected by an appropriate tuning of the deposition parameters. Within this context, the in situ measurement of the substrate curvature is a powerful diagnostic tool allowing a real time monitoring of the stress state of the growing film. This manuscript reviews a few recent applications of this technique and presents new measurements that point out the great potentials of the substrate curvature measurement in strain engineering. Our study also shows how, due to the high sensitivity of the technique, the correct interpretation of the results can be in certain cases not trivial and require complementary characterizations and an accurate knowledge of the physicochemical properties of the materials under investigation

Salve Regina

Arrangement of Giovanni Battista Pergolesi\u27s Salve Regina for solo voice, accompanied by two violins, viola, and harpischord.https://ecommons.udayton.edu/imri_sheetmusic/1080/thumbnail.jp

Energy conversion processes with perovskite-type materials

Mixed oxides derived from the perovskite structure by combination of A- and B-site elements and by partial substitution of oxygen provide an immense playground of physico-chemical properties. Here, we account for own research conducted at the Paul Scherrer Institute on perovskite-type oxides and oxynitrides used in electrochemical, photo(electro)chemical and catalytic processes aiming at facing energy relevant issues

Stabat Mater

Giovanni Battista\u27s Pergolesi\u27s Stabat Mater, or the Sorrows of Mary, for voice with unidentified accompaniment (likely for organ or piano).https://ecommons.udayton.edu/imri_sheetmusic/1082/thumbnail.jp

Stabat Mater

Giovanni Battista\u27s Pergolesi\u27s Stabat Mater, or the Sorrows of Mary, for a two-part women\u27s chorus (soprano and alto parts) with piano accompaniment.https://ecommons.udayton.edu/imri_sheetmusic/1083/thumbnail.jp

X-ray Absorption Linear Dichroism at the Ti K-edge of TiO2 anatase single crystal

Anatase TiO2 (a-TiO2) exhibits a strong X-ray absorption linear dichroism with the X-ray incidence angle in the pre-edge, the XANES and the EXAFS at the titanium K-edge. In the pre-edge region the behaviour of the A1-A3 and B peaks, originating from the 1s-3d transitions, is due to the strong $p$-orbital polarization and strong $p-d$ orbital mixing. An unambiguous assignment of the pre-edge peak transitions is made in the monoelectronic approximation with the support of ab initio finite difference method calculations and spherical tensor analysis in quantitative agreement with the experiment. It is found that A1 is mostly an on-site 3d-4p hybridized transition, while peaks A3 and B are non-local transitions, with A3 being mostly dipolar and influence by the 3d-4p intersite hybridization, while B is due to interactions at longer range. Finally, peak A2 which was previously assigned to a transition involving pentacoordinated titanium atoms exhibits a quadrupolar angular evolution with incidence angle. These results pave the way to the use of the pre-edge peaks at the K-edge of a-TiO2 to characterize the electronic structure of related materials and in the field of ultrafast XAS where the linear dichroism can be used to compare the photophysics along different axes.Comment: 43 pages, 19 figure