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In physics and physical chemistry, time-resolved spectroscopy is the study of dynamic processes in materials or chemical compounds by means of spectroscopic techniques.Most often, processes are studied after the illumination of a material occurs, but in principle, the technique can be applied to any process that leads to a change in properties of a material.
Time-domain diffuse optics [1] or time-resolved functional near-infrared spectroscopy is a branch of functional near-Infrared spectroscopy which deals with light propagation in diffusive media. There are three main approaches to diffuse optics namely continuous wave [ 2 ] (CW), frequency domain [ 3 ] (FD) and time-domain [ 4 ] (TD).
Ultrafast laser spectroscopy is a category of spectroscopic techniques using 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.
Consequently, in order to obtain a complete picture of its time evolution, femtosecond laser pulses are used as excitation source. Time-resolved techniques employed to this end are fluorescence upconversion, [32] [33] [34] Kerr-gated fluorescence spectroscopy [35] and time-correlated single photon counting. [36]
The method of Fourier-transform spectroscopy can also be used for absorption spectroscopy. The primary example is " FTIR Spectroscopy ", a common technique in chemistry. In general, the goal of absorption spectroscopy is to measure how well a sample absorbs or transmits light at each different wavelength.
After a time delay, a second, higher energy pulse photoemits the excited electron into free electron states above the vacuum level. Time-resolved two-photon photoelectron ( 2PPE ) spectroscopy is a time-resolved spectroscopy technique which is used to study electronic structure and electronic excitations at surfaces .
Absorption spectroscopy is spectroscopy that involves techniques that measure the absorption of electromagnetic radiation, as a function of frequency or wavelength, due to its interaction with a sample. The sample absorbs energy, i.e., photons, from the radiating field.
A diode-array detector can be used to obtain time-resolved spectra. [7] ... It is the link between the electrochemistry and the UV-Vis absorption spectroscopy. [3]