Destacats

Destacados

News

•  ColorSensing, a spin-off which resulted from a research project led by Dr. Daniel Prades, has received the Entrepreneurship Award (VII Edition) granted by the Fundació Caixa d’Enginyers (More information)

• Helium nanobubbles have been developed from the impact of ultraviolet light laser pulses 

Helium nanodroplets are quantum systems with extraordinary properties such as superfluidity, a non-friction motion at extremely low temperatures of   0.37 K. Due to these properties and the fact that helium droplets are chemically inert and completely transparent to the Infrared and visible light, are   commonly referred to as the "ideal test glass" for examining molecules captured by spectroscopy.

Now, an international research team, in which researchers from the Institute of Nanoscience and Naotechnology of the UB (IN2UB) Manuel Barranco and Martí Pi are involved, have determined how a nanodroplet of superfluid helium reacts when directly excited by a laser pulse. The results have been   published at the journal Nature Communications.   

The researchers have identified three elementary relaxation steps after photoexcitation: ultra-fast electron localization, electron decay in metastable states, and the formation of an empty bubble, which eventually bursts on the surface of the nanodroplets, thus expelling a single excited helium atom.

These results help us to understand how nanoparticles interact with energy radiation, as it happens when individual nanoparticles are directly  represented,  for example at the new European XFEL facility in Hamburg that emits ultra-short X-ray flashes.

This work, led by Frank Stienkemeier at Freiburg Institute of Physics (Germany) and Marcel Mudrich at University of Aarhus (Denmark), has been carried out from observations made at the Electron laser Radiation for Multidisciplinary Investigations (FERMI) in Triestre (Italy) where the ultra-fast reaction in helium nanodroplets had been previously observed after excitation with ultraviolet radiation obtained with the free electron laser at this facility.

M. Mudrich et al.  “Ultrafast relaxation of photoexcited superfluid He nanodroplets”. Nature Communications. 

 

 

 

►  11 February International Day of Women and Girls in Science: Women in scientific research

Venue: Aula Enric Casassas and Atrium Faculties of Physics and Chemistry from 15-17:30h

 IN2UB International Research Seminar (announcement)

"Nanoscale effects induced by mechanochemistry. Applications in catalysis"

By, Prof. Jordi Llorca, Institute of Energy Technologies (Universitat Politècnica de Catalunya)

Date: 29/01/2020 at 12h
Venue: Sala de Graus Eduard Fontserè (Faculties of Physics and Chemistry)

► Seminari (announcement)

"Recent Advances in Spintronics"

By, Prof. Fèlix Casanova, CIC nanoGUNE (Donostia)

Date: 29/11/2019 11.00-13.00h
Venue: Room 325 (3th Floor Faculty of Physics)

Jornada de Formació en Divulgació amb perspectiva de gènere de l’IN2UB (announcement)

Date: 25/11/2019, 9:00h – 11:45h
Venue: Enric Casassas Lecture Hall, Faculties of Physics and Chemistry. UB

 IN2UB International Research Seminar (announcement)

"Mesoporous silica nanoparticles as pharmacological nanocarriers"

By, Prof. María Vallet Regí, UCM-CIBER-BBN, Madrid

Date: 25/11/2019, 12.00h.
Venue: Enric Casassas Lecture Hall, Faculties of Physics and Chemistry. UB