Definition of attosecond-pump attosecond-probe spectroscopy

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Photonics Dictionary

attosecond-pump attosecond-probe spectroscopy: Attosecond-pump attosecond-probe spectroscopy (APAP) is an advanced technique in ultrafast spectroscopy that allows scientists to study the dynamics of electronic processes occurring on extremely short timescales, measured in attoseconds (10^-18 seconds). This cutting-edge approach involves the generation and manipulation of attosecond pulses of light to both excite and probe the electronic dynamics of atoms, molecules, or condensed matter systems.

Key components and features of attosecond-pump attosecond-probe spectroscopy include:

Attosecond pulses: Attosecond pulses are extremely short bursts of light with durations on the order of attoseconds. These pulses are generated through the process of high-harmonic generation (HHG), where intense laser pulses interact with a gas target to produce coherent bursts of extreme ultraviolet (XUV) or soft X-ray radiation.

Pump-probe scheme: In APAP spectroscopy, two synchronized laser pulses are used: the pump pulse and the probe pulse. The pump pulse, typically an intense infrared (IR) or visible laser pulse, excites the electronic system of interest by promoting electrons to higher energy states or inducing electronic motion. The attosecond probe pulse, generated using HHG, is then used to probe the resulting electronic dynamics with attosecond precision.

Temporal resolution: APAP spectroscopy offers unparalleled temporal resolution, allowing researchers to resolve electronic processes with attosecond precision. This enables the investigation of ultrafast phenomena such as electron tunneling, charge migration, and electronic coherence dynamics in real time.

Ultrafast dynamics: APAP spectroscopy provides insights into the ultrafast dynamics of electronic processes, including electron-ion interactions, charge transfer processes, and relaxation pathways following excitation. By studying these dynamics on attosecond timescales, researchers can gain a deeper understanding of fundamental processes in chemistry, physics, and materials science.

Applications: APAP spectroscopy has diverse applications in various scientific fields, including atomic and molecular physics, chemical dynamics, solid-state physics, and surface science. It is used to investigate phenomena such as photoionization, high-harmonic generation, ultrafast charge transfer, and quantum coherence in complex systems.

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