• Board
  • Seminar/Colloquim
Seminar/Colloquim

attosecond physics

본문

"Macroscopic properties of matter are inextricably linked to ultrafast phenomena evolving on an atomic and molecular scale. Observation and control of the atomic motion inside molecules in real time constitutes a triumph of ultrafast science [1] and was based on developments of femtosecond laser pulses.
However the motion of electrons, which evolves typically on a scale ranging from a few tens attoseconds (1 as =10-18 s) to a few tens femtoseconds (1 fs = 10-15 s), has hitherto remained inaccessible.
I present developments of tools that allow tracking and controlling of electron dynamics on an attosecond time scale. They comprise a combination of attosecond soft x-ray pulses [2] and precisely sub-cycle controlled light fields [3], [4]. This combination provides the highest temporal resolution available to date which is ~100 attoseconds (1 atomic unit of time ~ 24 attoseconds).
These tools will offer the potential to interrogate the electronic properties of a broad range of microscopic systems [4] for the first time. These include inner-shell ultrafast electron dynamics, electron transfer in chemical processes as well as the possibility to identify the ultimate frontiers of electronics given the day-to-day reduction of their size approaching the “few atoms per logic gate” limit.
"
top_btn