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How fast processes can we measure? Attosecond physics address the limit ofmeasurable time in science. Atomic X-ray excited states offers a way to studyextremely fast dynamics with chemical specificity. In black phosphorous anX-ray excited electron can relocate in 22.7 attoseconds. Using the lifetime ofthe P 1s core-hole as time-base, the radiationless decay spectrum can be usedto study charge transfer processes on the time-scale of the atomic unit of time(24 attoseconds). We demonstrate that the technique can be extended to within afew percent of the core hole's lifetime, an order of magnitude smaller thanpreviously thought.

Gone in 23 Attoseconds: Charge Transfer in Resonantly Core Excited Black Phosphorous