The development of attosecond pulses of light allowed researchers to explore the frame-by-frame movement of electrons.
To catch a glimpse of the subatomic world’s unimaginably fleet-footed particles, you need to produce unimaginably brief flashes of light. Anne L’Huillier, Pierre Agostini, and Ferenc Krausz have shared the 2023 Nobel Prize in Physics for their pioneering work in developing the ability to illuminate reality on almost inconceivably brief timescales.
It wasn’t clear how to make light oscillate any more quickly. But in 1987, Anne L’Huillier and her collaborators made an intriguing observation: If you shine a light on certain gases, their atoms will become excited and reemit additional colors of light that oscillate many times faster than the original laser—an effect known as “overtones.” L’Huillier’s group found that in gases like argon, some of these extra colors appeared brighter than others, but in an unexpected pattern.
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