Ultrafast Spectroscopy
Ultrafast Spectroscopy - Related Videos
09:38
Dissecting Mechanoenzymatic Properties of Processive Myosins with Ultrafast Force-Clamp Spectroscopy
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Cited by 1 •
2021
Presented here is a comprehensive protocol to perform ultrafast force-clamp experiments on processive myosin-5 motors, which could be easily extended to the study of other classes of processive motors. The protocol details all the necessary steps, from the setup of the experimental apparatus to sample preparation, data acquisition and analysis.
09:21
Mössbauer Spectroscopy
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2023
Source: Joshua Wofford, Tamara M. Powers, Department of Chemistry, Texas A&M University Mössbauer spectroscopy is a bulk characterization technique that examines the nuclear excitation of an atom by gamma rays in the solid state. The resulting Mössbauer spectrum provides information about the oxidation state, spin state, and electronic environment around the target atom, which, in combination, gives evidence about the electronic structure and ligand arrangement (geometry) of the molecule.
08:11
Infrared Spectroscopy
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2023
Source: Vy M. Dong and Zhiwei Chen, Department of Chemistry, University of California, Irvine, CA This experiment will demonstrate the use of infrared (IR) spectroscopy (also known as vibrational spectroscopy) to elucidate the identity of an unknown compound by identifying the functional group(s) present. IR spectra will be obtained on an IR spectrometer using the attenuated total reflection (ATR) sampling technique with a neat sample of the unknown.
05:57
Blood Flow Imaging with Ultrafast Doppler
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Cited by 10 •
2020
This protocol shows how to apply ultrafast ultrasound Doppler imaging to quantify blood flows. After a 1 s long acquisition, the experimenter has access to a movie of the full field of view with axial velocity values for each pixel every ≈0.3 ms (depending on the ultrasound time of flight).
09:20
X-ray Photoelectron Spectroscopy
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2023
Source: Faisal Alamgir, School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA X-ray photoelectron spectroscopy (XPS) is a technique that measures the elemental composition, empirical formula, chemical state and electronic state of the elements that exist within a material. XPS spectra are obtained by irradiating a material with a beam of X-rays while simultaneously measuring the kinetic energy and number of electrons that escape from the top several...
FAQs
The pump pulse initiates a photochemical or electronic process, and the probe pulse interrogates the system after a controlled delay. Comparing the probe response with the evolving state reveals time-dependent changes in absorption, reflection, or emission. This sequence connects an initially triggered event with subsequent molecular or material changes rather than recording only a static spectrum.
These timescales capture rapid excited-state relaxation, charge transfer, bond rearrangement, and energy transport that conventional spectroscopy may not resolve. Separating events according to when they occur helps distinguish early electronic changes from later structural or energetic processes. The resulting timeline can clarify which steps contribute to a light-driven reaction pathway.
Each measured optical response provides a different way to follow how the system changes after excitation. Time-dependent absorption can track evolving electronic states, while reflection or emission changes report other optical consequences of the same progression. Examining these signals over the experiment’s ultrashort timescale produces kinetic and spectral information about the evolving system.
The technique links spectral changes and their timing to processes such as excited-state relaxation, charge transfer, bond rearrangement, and energy transport. These observations help relate molecular structure to the sequence of events following light absorption. In this way, measurements can distinguish dynamic behavior associated with different stages of a photochemical process.
A typical experiment first directs an ultrashort pump pulse at the sample to initiate a photochemical or electronic event. A delayed probe pulse then measures a change in absorption, reflection, or emission while the system evolves. The collected time-dependent optical data are interpreted through their kinetics and spectral features to follow the triggered process.
Researchers choose them when the important molecular or material changes occur faster than conventional spectroscopy can distinguish. The method is especially relevant for light-driven processes involving excited-state relaxation, charge transfer, bond rearrangement, or energy transport. Resolving these rapid events supports analysis of reaction pathways and systems whose behavior depends on early-time dynamics.
Ultrafast measurements support the design and study of photocatalysts, solar-energy materials, sensors, and other systems governed by rapid light-driven processes. Their kinetic and spectral information shows how excitation evolves through relaxation, transfer, rearrangement, or transport. That connection between dynamics and function helps researchers relate observed performance to underlying molecular or material behavior.