IUVS Beamline

IUVS BEAMLINE @ Elettra

The IUVS beamline is devoted to the study of inelastic scattering with ultraviolet radiation, in a time-space domain not accessible at present by other facilities.  In the inelastic scattering process, an incident photon, with energy E_i, momentum, K_i and polarization p_i; interacts with the matter. In this interaction the photons can be diffused, with energy E_s, momentum K_s and polarization p_s. Here q=K_s-K_i is called "exchanged moment" and is of considerable importance in the study of inelastic diffusion. We can define the “elastic scattering” when the incident photon energy is the same of the diffused one while we refer to “inelastic scattering”  when there is an energy variation. It is important to point out that q is directly dependent on the time and energy as well as from the speed of light in the sample (and therefore on its refractive index).  

Research Highlights

Characteristic times

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Relaxation in the glass-forming solution LiCl-6H2O

We measured the dynamic structure factor of the liquid and glassy phases of the LiCl–6H2O solution by means of inelastic scattering of radiation in the visible, UV, and x-ray range, between 1 GHz and 10 THz, and by means of photon-correlation spectroscopy, between 0.01 Hz and 20 kHz.

S. C. Santucci et al, J. Chem. Phys. 131, 154507 (2009)

 

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Sound dispersion in water

The dynamic structure factor of normal and supercooled liquid water has been measured at a momentum transfer Q≈0.02-0.1  nm^-1, in the temperature range 253–340 K.


C. Masciovecchio et al,
Phys. Rev. Lett 92, 255507 (2004);
Phys. Rev. Lett  97, 225701 (2006).

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Structural relaxation in water under pressure

The density and temperature dependence of the structural relaxation time  tau in water was determined by inelastic ultraviolet scattering spectroscopy.


F. Bencivenga et al., J. Chem. Phys. 131, 144502 (2009)

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Hydrogen bond behaviour in bioprotectant mixtures

A Brillouin scattering investigation on trehalose-water solutions in a wide range of concentrations (0 < Φ < 0.74) and temperatures (-10 °C ≤ T ≤ 100 °C) has been carried out in the ultraviolet range and analysed in terms of continuous rearrangement of the HB network.  

S. Di Fonzo et al, J. Phys. Chem A 111. 12577 (2007)

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UV Resonant Raman scattering set-up at the IUVS beamline

At the IUVS beamline we have developed  a new resonant Raman scattering instrument working in the UV spectral range.

F. D'Amico et al. Nuclear Inst. and Methods in Physics Research, A  (2013) Volume 703 pp. 33-37

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Relaxation time on biological solutions: the example of acetic acid

Interactions between water and proteins play a fundamental role in biochemistry. In particular, the comprehension of the interaction mechanisms involving carboxylic and ammine groups is a starting point for understanding the protein folding mechanisms.
 
F. D'Amico et al, J. Phys. Chem. B 114, 10628 (2010)

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Hydrogen bonds behavior in acetic acid aqueous solutions: an high-resolved Raman study

A fitting procedure based on the Kubo-Anderson model has been applied to analyze Raman spectra of acetic acid aqueous solutions.

F. D'Amico et al. Journal of Physical Chemistry B  (2012) 116 (44), pp 13219–13227

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The peculiarity of IUVS is the specific kinematic region that can be investigated. IUVS beamline delivers photons with  incident energy between 5 and 11 eV. The almost-backscattering configuration with scattering angle theta of 178 degree, allows an exchanged momentum range of  2*10^-2-2*10^-1nm^-1, corresponding to 10-1000 µeV scattered energy. Therefore it can investigate a S(q,ω) kinematic region not accessible at present by other experimental techniques as Brillouin scattering with visible light, X-Ray scattering and neutron scattering. The beamline has been opened for users in 2003.

Proposal Submission

We invite users and collabrators to discuss thier proposals with the beamline local contacts well in advance before the submission deadline. This is crucial for a careful assesment of the experiment feasibility and may lead to improvements in the proposed experimental plan. In a restricted number of cases, when doubts arise about the suitability of your samples (sample absorption etc), it may be possible for you to arrange a test. Our website provides a wealth of informaiton on experiment feasibilty and proposal submission. For more info, please vist the IUVS Users section.

Call for proposals

The deadline for proposal submission for beamtime allocation from January 1st to June 30th, 2017 will be September 15th, 2016.