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2. Chemical and structural investigation of the cobalt phthalocyanineMatija Stupar, 2015, magistrsko delo Opis: In the last two decades, studies on organic molecules mimicking substances of fundamental importance in nature, like chlorophyll or hemoglobin, have attracted researchers’ attention. These molecules are building blocks for a family of materials also referred to as “organic semiconductors”. Such compounds can be implemented in numerous applications, ranging from data-storage to light harvesting. Some of their fundamental advantages include low cost, light weight, relatively easy engineering and mechanical flexibility, compatible with bending plastic substrates.
In this thesis work we investigated the chemical, structural and electronic properties of cobalt phthalocyanines (CoPc). These molecules have promising applications in the field of magnetic data storage and spintronics in general, due to the ferromagnetic properties of the cobalt atom. Several techniques like photoemission core-level spectroscopy and valence band spectroscopy, together with X-ray absorption, have been used in order to determine the CoPc properties in gaseous phase, i.e. in the absence of interaction with the surrounding environment.
Another set of experiments was devoted to the commissioning of the CITIUS time-resolved photoemission setup, that will be used in future studies of CoPc molecules on surfaces.
Najdeno v: osebi
Ključne besede: Cobalt phthalocyanine (CoPc), photoemission spectroscopy (PES), X-ray absorption spectroscopy (XAS), synchrotron radiation, laser, high order harmonic generation (HHG), time resolved spectroscopy
Objavljeno: 29.09.2015; Ogledov: 2851; Prenosov: 140
 Polno besedilo (2,96 MB) |
3. Control of the Polarization of a Vacuum-Ultraviolet, High-Gain, Free-Electron LaserGiovanni De Ninno, Primož Rebernik Ribič, David Gauthier, C. Grazioli, Barbara Ressel, E. Allaria, 2014, izvirni znanstveni članek Najdeno v: osebi
Ključne besede: laser na proste elektrone, relativistični elektroni, polarizacija
Objavljeno: 29.02.2016; Ogledov: 1286; Prenosov: 169
Polno besedilo (1,92 MB) |
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5. New strategy for magnetic gas sensingRoberta Ciprian, Piero Torelli, Angelo Giglia, B Gobaut, Barbara Ressel, Janez Štupar, Matija Stupar, Antonio Caretta, Giovanni De Ninno, Tommaso Pincelli, Barbara Casarin, Ganesh Adhikari, G Sberviglieri, C Baratto, Marco Malvestuto, 2016, izvirni znanstveni članek Najdeno v: osebi
Ključne besede: hybrid nanostructures, sensor, absorption spectroscopy
Objavljeno: 05.02.2018; Ogledov: 469; Prenosov: 0
Polno besedilo (2,25 MB) |
6. Tunable orbital angular momentum in high-harmonic generationDavid Gauthier, Primoz Rebernik-Ribic, Ganesh Adhikari, A Camper, C Chappuis, LF Dimauro, G Dovillaire, Fabio Frassetto, R Geneaux, Paolo Miotti, Luca Poletto, Barbara Ressel, C. Spezzani, Matija Stupar, T Ruchon, Giovanni De Ninno, 2017, izvirni znanstveni članek Najdeno v: osebi
Ključne besede: Angular orbital momentum, High harmonic generation
Objavljeno: 05.02.2018; Ogledov: 568; Prenosov: 37
Polno besedilo (843,67 KB) |
7. Ultra-Fast-VUV Photoemission Study of UV Excited 2-NitrophenolPetra Rudolf, Luca Poletto, Fabio Frassetto, Paolo Miotti, Antti Kivimak̈i, Monica de Simone, Cesare Grazioli, Barbara Ressel, Giovanni De Ninno, C. Spezzani, Carlo Callegari, Marcello Coreno, A. Ciavardini, Simona Fornarini, Marco Pezzella, Enrico Bodo, Susanna Piccirillo, 2019, izvirni znanstveni članek Opis: The initial deactivation pathways of gaseous 2-nitrophenol excited at 268 nm were investigated by time-resolved photoelectron spectroscopy (TRPES) with femtosecond-VUV light, produced by a monochromatized high harmonic generation source. TRPES allowed us to obtain new, valuable experimental information about the ultrafast excited-state dynamics of 2-nitrophenol in the gas phase. In accord with recent ab initio on-the-fly nonadiabatic molecular dynamic simulations, our results validate the occurrence of an ultrafast intersystem crossing leading to an intermediate state that decays on a subpicosecond time scale with a branched mechanisms. Two decay pathways are experimentally observed. One probably involves proton transfer, leading to the most stable triplet aci-form of 2-nitrophenol; the second pathway may involve OH rotation. We propose that following intersystem crossing, an ultrafast fragmentation channel leading to OH or HONO loss could also be operative.
Najdeno v: osebi
Ključne besede: Ultrafast photoemission, nitrophenol
Objavljeno: 12.02.2019; Ogledov: 134; Prenosov: 0
Polno besedilo (1,81 MB) |
8. Conclusively Addressing the CoPc Electronic Structure: A Joint Gas- Phase and Solid-State Photoemission and Absorption Spectroscopy StudyMarcello Coreno, Monica de Simone, Ieva Bidermane, Y. Sassatelli, R. Ovsyannikov, Erika Giangrisostomi, C. Grazioli, J. Lüder, Valeria Lanzillotto, I.E. Brumboiu, Teng Zhang, Barbara Ressel, Matija Stupar, Maddalena Pedio, Petra Rudolf, Barbara Brena, Carla Puglia, 2017, izvirni znanstveni članek Najdeno v: osebi
Ključne besede: Cobalt Phtalocyanine, photoemission spectroscopy, gas phase, solid state
Objavljeno: 07.02.2018; Ogledov: 426; Prenosov: 0
Polno besedilo (1,38 MB) |
9. Giant magneto–electric coupling in 100 nm thick Co capped by ZnO nanorodsGiovanni Vinai, Barbara Ressel, Piero Torelli, Federico Loi, Benoit Gobaut, Regina Ciancio, Barbara Casarin, Antonio Caretta, Luca Capasso, Fulvio Parmigiani, Francesco Cugini, Massimo Solzi, Marco Malvestuto, Roberta Ciprian, 2018, izvirni znanstveni članek Najdeno v: osebi
Ključne besede: ZnO nanorods, Cobalt, X-rays absorption near edge spectroscopy
Objavljeno: 07.02.2018; Ogledov: 444; Prenosov: 0
Polno besedilo (3,44 MB) |
10. Orbital-dependent electron dynamics in Fe-pnictide superconductorsA. Thamizhavel, Damjan Krizmancic, Giovanni De Ninno, Jurij Urbančič, Primož Rebernik Ribič, Barbara Ressel, G. Adhikary, Kalobaran Maiti, Matija Stupar, 2018, izvirni znanstveni članek Opis: We report on orbital-dependent quasiparticle dynamics in EuFe 2 As 2, a parent compound of Fe-based superconductors, and a way to experimentally identify this behavior using time-and angle-resolved photoelectron spectroscopy across the spin density wave transition. We observe two different relaxation timescales for photoexcited d x z/d y z and d x y electrons. While the itinerant d x z/d y z electrons relax faster through the electron-electron scattering channel, d x y electrons form a quasiequilibrium state with the lattice due to their localized character, and the state decays slowly. Our findings suggest that electron correlation in Fe pnictides is an important property, which should carefully be taken into account when describing the electronic properties of both parent and carrier-doped compounds, and therefore establish a strong connection with cuprates
Najdeno v: osebi
Ključne besede: photoelectron dynamics, Fe based superconductors
Objavljeno: 29.11.2018; Ogledov: 195; Prenosov: 0
Polno besedilo (2,37 MB) |
