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Classical and Advanced Spectroscopy




Scientific Leader: Prof. Simonpietro Agnello
Co-Leader: Dr. Fabrizio Messina
Co-Leader: Dr. Salvatore Stivala

The laboratory uses classical spectroscopy (absorption, photoluminescence) and advanced techniques in the UV-VIS-IR-FIR range for the structural and functional characterization of molecular systems, as well as simple and complex material systems (organic, biological, hybrid). Additionally, it is possible to investigate the electronic and vibrational properties and molecular structures that changes over time and/or as a function of the external environment. The laboratory offers Raman spectroscopic investigations with spatial resolution down to a micrometer and three-dimensional maps (xyz), for research and industrial applications, in all sectors that investigates the properties of materials in the solid, liquid and gaseous state. The multifrequency measurements with laser excitation at: 1064 nm, 785 nm, 633 nm, 532 nm, 325 nm allows Raman to detect signals with high efficiency by avoiding fluorescence signals. Furthermore, analyses are possible during treatments in controlled atmosphere (O2, N2, CO2, Ar) in the temperature range from 77 to 873 K. The laboratory also provides a femtosecond laser source, capable of producing light pulses with a very high intensity and extremely short duration, within different frequency ranges. This source allows two types of applications: Terahertz spectroscopy/imaging (in the range 0.2 - 3.5 THz with a typical spectral resolution <25 GHz, spatial resolution down to 300 µm and in a nitrogen atmosphere) and femtosecond pump/probe spectroscopy (excitation with pulses of 50-70 fs duration tunable in the visible range, and detection from 320 to 700 nm, with 3 nm spectral resolution and temporal resolution variable from 70 to 150 fs). In general, the laboratory can carry out an entire non-invasive analysis in various areas with particular references to those of Human Health, Materials Science, Industrial and Cultural Heritage. The femtoseconds pump/probe spectroscopy allows the analysis of the molecular dynamics of materials and molecular systems to be stimulated by a light impulse. Materials handling applications are also possible, such as cuts, inscriptions, drilling, micro-engineering of components, production of nanomaterials for laser ablation, surface cleaning and direct writing of fiber optic gratings.
Fields of application: Physical-Chemical Analysis of materials and molecular systems, Human Health, Agrifood, Environment, Materials Science, Forensic Sciences, Cultural Heritage, Pharmaceutical, Industrial.