In Situ Spectroscopy
In Situ Spectroscopy - Related Videos
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.
07:49
Characterizing Lewis Pairs Using Titration Coupled with In Situ Infrared Spectroscopy
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Cited by 4 •
2020
Here, we present a method for the observation of solution interactions between Lewis acids and bases by employing in situ infrared spectroscopy as a detector for titration under synthetically relevant conditions. By examining solution interactions, this method represents a complement to X-ray crystallography, and provides an alternative to NMR spectroscopy.
09:26
Raman Spectroscopy for Chemical Analysis
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2023
Source: Laboratory of Dr. Ryoichi Ishihara — Delft University of Technology Raman spectroscopy is a technique for analyzing vibrational and other low frequency modes in a system. In chemistry it is used to identify molecules by their Raman fingerprint. In solid-state physics it is used to characterize materials, and more specifically to investigate their crystal structure or crystallinity. Compared to other techniques for investigating the crystal structure (e.g. transmission electron...
10:22
In Situ SIMS and IR Spectroscopy of Well-defined Surfaces Prepared by Soft Landing of Mass-selected Ions
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Cited by 4 •
2014
Soft landing of mass-selected ions onto surfaces is a powerful approach for the highly-controlled preparation of novel materials. Coupled with analysis by in situ secondary ion mass spectrometry (SIMS) and infrared reflection absorption spectroscopy (IRRAS), soft landing provides unprecedented insights into the interactions of well-defined species with surfaces.
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.
FAQs
Each interaction with electromagnetic radiation produces a spectral response that can be examined for information about the material. These responses help researchers track chemical reactions, electronic states, lattice vibrations, phase transitions, and other changes. Selecting the relevant spectral behavior allows measurements to connect observed signals with microscopic processes occurring inside materials, at surfaces, or in working devices.
These conditions shape the behavior being measured, so controlling them helps distinguish changes caused by the experiment from changes arising within the material itself. By varying one or more conditions while recording spectra, physicists can follow how a phase, reaction, electronic state, or lattice response evolves. The resulting trends clarify which environments produce particular material behaviors.
Real-time tracking shows how a material changes as a process occurs, rather than providing only separate starting and ending observations. This temporal information helps identify evolving phase transitions, reactions, electronic states, or lattice vibrations. Because the system is not interrupted, the measured response remains connected to the working conditions that produce the observed behavior.
The material, surface, or device is placed in its working environment, and the relevant environmental or operating condition is controlled. Electromagnetic radiation is then used to collect spectral responses while temperature, pressure, atmosphere, electrical bias, or mechanical stress changes as required. Researchers analyze the resulting sequence of spectra to follow dynamic behavior under those conditions.
The measurements can reveal changes in phase, chemical activity, electronic structure, lattice vibrations, and related material behavior. Interpreting these spectral changes helps physicists connect microscopic mechanisms with macroscopic performance. This is especially useful when the behavior of a material, surface, or device depends strongly on its operating environment or changes during use.
In Situ Spectroscopy supports investigations of materials, surfaces, devices, and condensed-matter phenomena. It is useful when researchers need to observe behavior under changing environmental or operating conditions instead of studying an isolated, unchanging sample. The method can therefore link dynamic microscopic processes to the performance of systems examined in physics experiments.