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Related Concept Videos

IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

4.5K
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...
4.5K
IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

1.8K
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...
1.8K
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

2.8K
A covalently bonded heteronuclear diatomic molecule can be modeled as two vibrating masses connected by a spring. The vibrational frequency of the bond can be expressed using an equation derived from Hooke's law, which describes how the force applied to stretch or compress a spring is proportional to the displacement of the spring. In this case, the atoms behave like masses, and the bond acts like a spring.
According to Hooke's law, the vibrational frequency is directly proportional to...
2.8K
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

1.1K
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...
1.1K
Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

1.4K
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...
1.4K
UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

2.7K
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...
2.7K

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Author Spotlight: Unveiling the Potential of VSFG Microscopy in Studying Mesoscopically Heterogeneous Self-Assembled Structures
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Complementary vibrational spectroscopy.

Kazuki Hashimoto1,2, Venkata Ramaiah Badarla3, Akira Kawai1

  • 1Department of Physics, The University of Tokyo, Tokyo, 113-0033, Japan.

Nature Communications
|September 29, 2019
PubMed
Summary
This summary is machine-generated.

Researchers developed a single instrument for simultaneous infrared absorption and Raman scattering spectroscopy. This dual-modal technique provides complete molecular fingerprint spectra for enhanced analysis of organic liquids.

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Area of Science:

  • Molecular spectroscopy
  • Optical sensing and imaging

Background:

  • Infrared absorption and Raman scattering spectroscopy are vital for label-free analysis.
  • These methods offer complementary data but require separate instruments due to wavelength differences.
  • Achieving complete vibrational spectra from a single device is a significant challenge.

Purpose of the Study:

  • To demonstrate a single instrument capable of simultaneous infrared absorption and Raman scattering spectroscopy.
  • To overcome the limitations of separate measurements and obtain complete vibrational information.
  • To enable precise and accurate molecular analysis through comprehensive spectral data.

Main Methods:

  • Utilized an ultrashort pulsed laser system.
  • Implemented dual-modal Fourier-transform spectroscopy.
  • Leveraged nonlinear optical effects for efficient spectral acquisition.

Main Results:

  • Achieved simultaneous measurement of broadband infrared absorption and Raman scattering spectra.
  • Acquired complete vibrational spectra in the molecular fingerprint region.
  • Demonstrated rapid, high spectral resolution measurements of organic liquids.

Conclusions:

  • The developed instrument provides a unified platform for comprehensive vibrational spectroscopy.
  • This dual-modal approach enhances molecular analysis capabilities.
  • Enables precise identification and characterization of chemical compounds.