World’s quickest laser pulse can track electrons in slow motion

The system uses a mid-infrared laser to generate “soft” X-ray pulses with an extremely large spectral bandwidth. Previous attosecond-level pulses revolved around titanium-sapphire lasers, which limited the potential photon energy and effectively ruled out studying large chunks of the periodic table. ETH’s breakthrough could significantly improve our understanding of how electrons behave, but there are …

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