Publication

Observing Photochemical Transients by Ultrafast X-Ray Absorption Spectroscopy

Majed Chergui
2003
Journal Articles

Abstract

Accurate detn. of the transient electronic structures, which drive photochem. reactions, is crucial in chem. and biol. The authors report the detection of transient chem. changes on the picosecond time scale by x-ray-absorption near-edge structure of photoexcited aq. [Ru(bpy)3]2+. Upon ultrashort laser pulse excitation a charge transfer excited state having a 300 ns lifetime is formed. The authors detect the change of oxidn. state of the central Ru atom at its L3 and L2 edges, at a temporal resoln. of 100 ps with the zero of time unambiguously detd. [on SciFinder (R)]

Official source

https://infoscience.epfl.ch/entities/publication/f386e83c-b6ac-4f43-9ff3-e1a7abf58ecc

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Majed Chergui
2003
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/f386e83c-b6ac-4f43-9ff3-e1a7abf58ecc

About this result

Related concepts (25)

Ultrafast laser spectroscopy

Ultrafast laser spectroscopy is a spectroscopic technique that uses ultrashort pulse lasers for the study of dynamics on extremely short time scales (attoseconds to nanoseconds). Different methods are used to examine the dynamics of charge carriers, atoms, and molecules. Many different procedures have been developed spanning different time scales and photon energy ranges; some common methods are listed below. Dynamics on the as to fs time scale are in general too fast to be measured electronically.

Terahertz time-domain spectroscopy

In physics, terahertz time-domain spectroscopy (THz-TDS) is a spectroscopic technique in which the properties of matter are probed with short pulses of terahertz radiation. The generation and detection scheme is sensitive to the sample's effect on both the amplitude and the phase of the terahertz radiation. Typically, an ultrashort pulsed laser is used in the terahertz pulse generation process. In the use of low-temperature grown GaAs as an antenna, the ultrashort pulse creates charge carriers that are accelerated to create the terahertz pulse.

Spectroscopy

Spectroscopy is the field of study that measures and interprets the electromagnetic spectra that result from the interaction between electromagnetic radiation and matter as a function of the wavelength or frequency of the radiation. Matter waves and acoustic waves can also be considered forms of radiative energy, and recently gravitational waves have been associated with a spectral signature in the context of the Laser Interferometer Gravitational-Wave Observatory (LIGO).

Related publications (2)

Observing Photochemical Transients by Ultrafast X-Ray Absorption Spectroscopy

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