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Cuttingedge technology R-2 Ultrafast strobe light source with ultrashort attosecond pulse Characterizing inner-shell electron using ultrashort attosecond pulse We successfully observed inner-shell electron motion using isolated ultrashort attosecond (as: 10-18 second) pulses of light. It behaves as an instantaneous strobe light and can directly access the inner-shell electron with ultrashort decay time. The research on the inner shell is importance for studies in quantum optics, chemistry, and material science in the future. Features ■ The attosecond light source has shortest temporal duration in the world. As a camera needs a high-speed shutter to take stopmotion snap shots, an instantaneous strobe light of isolated attosecond pulse (IAP) is necessary to observe the ultrafast electron motion. ■ Since an inner-shell electron has an ultrafast motion, its properties have been characterized. We successfully observed the innershell motion using the IAP. Application Scenarios 【Fundamental research】 ■ The achievement for inner shell with ultrafast motion will pave the way for the study of novel chemical reactions and create new materials. 【Application】 ■ The inner shell could be useful for development of new type of ultrafast photonic and electronic devices in the future. Attosecond (as) : 10-18 second (one quintillionth of a second) Femtosecond (fs) : 10-15 second (one quadrillionth of a second) 〈Contact〉[email protected] Copyright © 2016 NTT. All Rights Reserved.