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Molecules in the spotlight
Date:12/12/2008

This release is available in French.

A novel x-ray technique allowing the observation of molecular motion on a time scale never reached before has been developed by a team of researchers from EPFL and the Paul Scherrer Institute (PSI) in Switzerland. Results of the research led by Professor Majed Chergui, head of EPFL's laboratory of Ultrafast Spectroscopy in collaboration with the FEMTO group at PSI appear online December 11 in the journal Science.

This discovery opens promising prospects for the study of chemical and biological systems. It allows a better understanding of the structural evolution of molecules during a chemical reaction. The researchers have applied it to the study of metal-based molecular complexes, of high interest in chemistry. This could lead to applications in magnetic data storage or solar energy. It also opens new perspectives in biology, because the molecules studied are analogous to the active center in hemoproteins (haemoglobin, myoglobin).

Structural evolution

It is possible to follow a cat landing on its feel in "real time" using a camera with shutter times on the order of tens of milliseconds. To do the same with molecules, 100 000 million times smaller than cats, requires shutter times that are 100 000 million times faster -- a few tens of femtoseconds (1 femtosecond is to a second what a second is to 32 million years).

Although there are lasers that permit such shutter speeds, no existing optical methods can capture the molecular structure. In order to overcome this limitation, Chergui's team combined lasers delivering femtosecond pulses of ultraviolet-visible light with a source of femtosecond X-ray pulses, in a technique now known as ultrafast X-Ray Absorption Spectroscopy. "With the extremely short wavelengths of this kind of pulsed radiation, it is possible to observe the mo
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Contact: Majed Chergui
majed.chergui@epfl.ch
41-076-569-5566
Ecole Polytechnique Fdrale de Lausanne
Source:Eurekalert

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