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Related Concept Videos

IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

When Infrared (IR) radiation passes through a covalently bonded molecule, the bonds transition from lower to higher vibrational levels. The fundamental vibrational motions that result in infrared absorption can be classified as stretching or bending vibrations.
Stretching vibrations are vibrational motions that occur along the bond line, changing the bond length or distance between two bonded atoms. They are further distinguished as symmetric or asymmetric. In symmetric stretching, the...
UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this process,...
Applications of IR Spectroscopy: Overview01:11

Applications of IR Spectroscopy: Overview

The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...
Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for electronic transitions. As a result...
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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...
Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...

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Related Experiment Video

Updated: Jul 12, 2026

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
10:35

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

Published on: May 29, 2018

Novel Chiroptical Spectroscopy Technique.

Jorge Olmos-Trigo1, Cristina Sanz-Fernández2, Ivan Fernandez-Corbaton3

  • 1Universidad Autónoma de Madrid, Departamento de Física de Materiales, 28049 Madrid, Spain.

Physical Review Letters
|July 10, 2026
PubMed
Summary

This study introduces a novel spectroscopy technique to detect object chirality by measuring light polarization. The method effectively identifies chiral enantiomers and eliminates background noise, offering a robust new tool for chirality detection.

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Area of Science:

  • Optics and Photonics
  • Spectroscopy
  • Chirality Studies

Background:

  • Chiral objects interact differently with left and right circularly polarized light.
  • Circular dichroism spectroscopy is the standard method for detecting chirality.
  • Existing methods can be sensitive to concentration and optical path length.

Purpose of the Study:

  • To present a new spectroscopy technique for detecting chirality in dipolar objects.
  • To introduce a chirality measure independent of concentration and optical path length.
  • To demonstrate the ability to distinguish enantiomer predominance in solutions.

Main Methods:

  • Measuring Stokes parameters at nonforward angles.
  • Developing a novel chirality measure.
  • In situ verification using Stokes vector measurements at multiple angles.

Main Results:

  • The new technique effectively detects chirality in dipolar objects.
  • The introduced chirality measure eliminates achiral background noise.
  • The method successfully discerns the predominant enantiomer in mixed solutions.
  • Demonstrated robustness and in situ verifiability.

Conclusions:

  • A new, robust spectroscopy technique for chirality detection has been developed.
  • This method offers advantages over traditional circular dichroism spectroscopy.
  • The technique is suitable for analyzing chiral objects in various concentrations and path lengths.