X-Ray absorption spectrometer


·         Rigaku R-XAS

Over the last two decades, X-ray absorption spectroscopy (XAS) has emerged as an incisive probe of the local structure around selected atomic species in solids and liquids. Foremost among its strengths are its applicability to amorphous materials and its tunability; that is, the ability to probe the environments of different elements in the sample by selecting the incident X-ray energy. Outside of single crystal X-ray diffraction and nuclear magnetic resonance (NMR), few other techniques allow such probing of molecular structure.

rigaku 1


rigaku 2


rigaku 3


rigaku 4


·         XAS Applications
Structural and electronic local environment.
Chemically selective determination in a wide region for absorbing atoms (from 4000 to 25000 eV)

Coordination number
Bond lengths
Thermal and structural disorder

Average oxidation state
Local symmetry
Density of empty states
Electronic transfer


Contact: Dr. Martín Mizrahi (mizrahi@fisica.unlp.edu.ar)

                 Dr. José Ramallo-López (ramallolopez@gmail.com)


Langmuir-Blodgett trough


·         The group is equipped a Langmuir-Blodgett trough (KSV NIMA) for the purpose of investigating water-insoluble monolayers of organic molecules and nanoparticles, among other interesting systems, which are spread at the air-water interface. As a main characteristics of monolayers, the compression isotherms can be recorded in conjunction with their corresponding potential isotherms.


·         Monolayers can be transfered onto solid substrates employing the well established Langmuir-Blodgett technology, and the deposited LB-films can be analyzed by various analytical techniques including imaging ellipsometry, STM/AFM, X-ray reflectivity, GISAXS or contact angle measurements.


·         The KSV 5000 system 3 is a computer controlled and programmable Langmuir-Blodgett instrument for the study of monolayers at the air-water interface as well as for the automated Langmuir film experiments and deposition of normal or alternating multilayers onto solid substrates. The LB Instrument is equipped with a set of specially designed troughs to broaden and facilitate the use of the instrument.

Langmuir Blodgett 1


Langmuir Blodgett 2