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We demonstrate experimentally the isolation of single attosecond pulses atthe carbon K- shell edge in the soft-X-ray water window. Attosecond pulses atphoton energies that cover the principal absorption edges of the buildingblocks of materials are a prerequisite for time resolved probing of thetriggering events leading to electronic dynamics such as exciton formation andannihilation. Herewith, we demonstrate successful isolation of individualattosecond pulses at the carbon K edge (284 eV) with a pulse duration below 400as and with a bandwidth supporting a 30 as pulse duration. Our approach isbased on spatio-temporal isolation of ponderomotively shifted harmonics andvalidates a straightforward and scalable approach for robust and reproducibleattosecond pulse isolation.

Spatio-temporal isolation of attosecond soft X-ray pulses in the water window