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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

2.6K
The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
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Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

2.3K
Identical bonds within a polyatomic group can stretch symmetrically (in-phase) or asymmetrically (out-of-phase). Similar to hydrogen bonding, these vibrations also influence the shape of the IR peak. Generally, asymmetric stretching frequencies are higher than symmetric stretching frequencies. For example, primary amines exhibit two distinct IR peaks between 3300–3500 cm−1 corresponding to the symmetric and asymmetric N-H stretching, while secondary amines exhibit a single...
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¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

2.2K
A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
2.2K
Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule01:10

Interpreting ¹H NMR Signal Splitting: The (n + 1) Rule

3.2K
In the AX proton spin system, proton A can sense the two spin states of a coupled proton X, resulting in a doublet NMR signal with two peaks of equal (1:1) intensity. When proton A is coupled to two equivalent protons (AX2 spin system), the spin states of each X can be aligned with or against the external field, creating three possible scenarios. This results in a 1:2:1  triplet signal, where the central peak corresponds to the chemical shift of A and is twice as large or intense as the...
3.2K
Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

1.7K
Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
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Updated: Apr 13, 2026

Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems
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Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional π-conjugate Systems

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Antisymmetric Raman Response.

Mattia Udina1,2, Indranil Paul1

  • 1CNRS, Université Paris Cité, Laboratoire Matériaux et Phénomènes Quantiques, 75205 Paris, France.

Physical Review Letters
|April 11, 2026
PubMed
Summary
This summary is machine-generated.

We introduce antisymmetric Raman response, a new method to study materials. This technique, unlike standard Raman scattering, reveals microscopic details by focusing on interband processes.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Spectroscopy

Background:

  • Standard Raman response spectroscopy probes material properties through intra- and interband electronic transitions.
  • Symmetry properties of materials dictate the allowed responses in spectroscopic measurements.

Purpose of the Study:

  • To develop the theory of antisymmetric Raman response, a novel spectroscopic technique.
  • To establish antisymmetric Raman response as a tool for probing interband energy scales and detecting symmetry breaking.

Main Methods:

  • Theoretical development of antisymmetric Raman response, defined by specific photon polarization exchanges.
  • Analysis of cross-susceptibilities, excluding intraband terms.
  • Application of the theory to charge density wave rare-earth tritellurides and excitonic insulator Ta2NiSe5.

Main Results:

  • Antisymmetric Raman response is finite in systems with orthorhombic or lower symmetry.
  • This response is characterized by the absence of intraband contributions, distinguishing it from standard Raman scattering.
  • The theory provides a unique pathway to probe interband energy scales and identify reflection symmetry breaking.

Conclusions:

  • Antisymmetric Raman response is a powerful new tool in condensed matter physics.
  • It offers unique insights into the electronic structure and symmetry of materials.
  • This method complements existing spectroscopic techniques for advanced materials characterization.