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Related Concept Videos

IR Spectrometers01:25

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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...
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

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 stretching vibration...
Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

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...
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...
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,...

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Related Experiment Video

Updated: Jul 7, 2026

Multimodal Nonlinear Hyperspectral Chemical Imaging Using Line-Scanning Vibrational Sum-Frequency Generation Microscopy
08:49

Multimodal Nonlinear Hyperspectral Chemical Imaging Using Line-Scanning Vibrational Sum-Frequency Generation Microscopy

Published on: December 1, 2023

Anisotropy studied by polarization-modulated fourier transform infrared reflection difference microspectroscopy.

M Schmidt1, J S Lee, M Grunze

  • 1Angewandte Physikalische Chemie, Universität Heidelberg, Im Neuenheimer Feld 253, 69120 Heidelberg, Germany.

Applied Spectroscopy
|February 21, 2008
PubMed
Summary

Researchers developed a new method to study optical anisotropy in solid materials using infrared reflection microspectroscopy. This technique successfully identified and mapped anisotropic domains in complex crystals, offering insights into material properties.

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Polarization-Sensitive Two-Photon Microscopy for a Label-Free Amyloid Structural Characterization
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Polarization-Sensitive Two-Photon Microscopy for a Label-Free Amyloid Structural Characterization

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Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
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Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals

Published on: April 14, 2020

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Last Updated: Jul 7, 2026

Multimodal Nonlinear Hyperspectral Chemical Imaging Using Line-Scanning Vibrational Sum-Frequency Generation Microscopy
08:49

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Published on: December 1, 2023

Polarization-Sensitive Two-Photon Microscopy for a Label-Free Amyloid Structural Characterization
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Polarization-Sensitive Two-Photon Microscopy for a Label-Free Amyloid Structural Characterization

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Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
07:24

Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals

Published on: April 14, 2020

Area of Science:

  • Solid-state physics
  • Materials science
  • Optical spectroscopy

Background:

  • Anisotropic optical behavior is crucial for understanding solid-state material properties.
  • Characterizing optical anisotropy requires precise experimental techniques.

Purpose of the Study:

  • To develop and demonstrate a novel experimental scheme for spectrally and spatially resolving optical anisotropy in solid-state materials.
  • To investigate the anisotropic optical behavior of Ca1.8Sr0.2RuO4 and Ca1.4Sr0.6RuO4 crystals.
  • To map the spatial distribution of anisotropy in Bi0.17Ca0.83MnO3+delta.

Main Methods:

  • Fourier transform infrared reflection microspectroscopy
  • Polarization modulation
  • Infrared synchrotron radiation

Main Results:

  • An isotropic crystal (Ca1.8Sr0.2RuO4) showed near-zero reflection difference, independent of azimuthal angle.
  • An anisotropic crystal (Ca1.4Sr0.6RuO4) exhibited a strong, sinusoidally dependent anisotropic optical response.
  • Microscopic anisotropic domains with distinct optical axes were resolved in Bi0.17Ca0.83MnO3+delta.

Conclusions:

  • The developed experimental scheme is a powerful tool for analyzing optical anisotropy in solid-state materials.
  • The technique enables spectral and spatial resolution of anisotropy in the mid-infrared region.
  • This method provides valuable insights into the optical properties of anisotropic materials.