A free-electron laser produced hard X-ray pulses measured to be 100 to 400 attoseconds long, the first direct experimental confirmation of attosecond pulses at these photon energies.
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Experimental demonstration of attosecond hard X-ray pulses
A free-electron laser produced hard X-ray pulses measured to be 100 to 400 attoseconds long, the first direct experimental confirmation of attosecond pulses at these photon energies.