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Scientists at EPFL have developed a new laser-based technique that can measure ultrafast changes in the structural symmetry of molecules, called chirality, tracking their conformational shifts in ...
Credit: Paul Scherrer Institute/Mahir Dzambegovic Researchers at the Paul Scherrer Institute PSI have succeeded for the first time in looking inside materials using the method of transient grating spectroscopy with ultrafast X-rays at SwissFEL. The experiment at PSI is a milestone in observing processes in the world of atoms. The researchers are publishing their research results today in the journal Nature Photonics. The structures on microchips are becoming ever tinier; hard disks write entire encyclopedias on magnetic disks the size of a fingernail. Many technologies are currently breakin...
E-Mail IMAGE: A pulsed beam of X-rays is incident on a diamond mask (blue), creating a grating of excitation on the sample. A laser beam (thin blue line on the right) is... view more Credit: Ella Maru Studio (https://scientific-illustrations.com) Transient grating spectroscopy is an elegant method that uses two laser pulses to activate a medium by creating an interference pattern made of parallel stripes of excitations that can be thermal, electronic, magnetic or even structural. The modulation depth of the pattern and its evolution can be measured by diffracting a third, time-del...