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Related Concept Videos

IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

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

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

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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...
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Vibrating Concrete01:19

Vibrating Concrete

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Mechanical vibrators are instrumental in compacting newly poured concrete within formwork and around reinforcements. This process is essential to eliminate trapped air pockets and establish a dense concrete mass. One widely used method is vibrating by internal vibrators, often referred to as a poker vibrator or immersion vibrator. It is rapidly inserted through the full depth of the freshly laid concrete and slightly extends into the layer below it (which remains in a plastic state). Consistent...
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IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

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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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Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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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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Atomic Fluorescence Spectroscopy01:29

Atomic Fluorescence Spectroscopy

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Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which...
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Related Experiment Video

Updated: Feb 6, 2026

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization
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Multidimensional Vibrational Coherence Spectroscopy.

Tiago Buckup1, Jérémie Léonard2

  • 1Physikalisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 229, 69120, Heidelberg, Germany. tiago.buckup@pci.uni-heidelberg.de.

Topics in Current Chemistry (Cham)
|August 25, 2018
PubMed
Summary
This summary is machine-generated.

Multidimensional vibrational coherence spectroscopy (multi-VCS) offers insights into molecular dynamics. This review covers key techniques and their application in understanding structural changes and photochemical reactions in systems like carotenoids and stilbenes.

Keywords:
Coherence spectroscopyExcited statesMultidimensional spectroscopyPhotoisomerizationRamanUltrafast laser spectroscopyVibrational spectroscopyVibronic coupling

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Area of Science:

  • Physical Chemistry
  • Laser Spectroscopy
  • Molecular Dynamics

Background:

  • Multidimensional vibrational coherence spectroscopy (multi-VCS) has become increasingly important in laser spectroscopy since the 1990s.
  • Understanding molecular structural changes and photochemical reactions requires advanced spectroscopic techniques.

Purpose of the Study:

  • To introduce the principles of vibrational coherence spectroscopy (VCS).
  • To review the three most widespread experimental methods for multi-VCS.
  • To illustrate the application of multi-VCS in studying molecular systems.

Main Methods:

  • Review of femtosecond stimulated Raman spectroscopy, pump-impulsive vibrational spectroscopy, and pump-degenerate four wave-mixing.
  • Focus on signal generation and analysis in time and spectral domains.
  • Discussion of overcoming data interpretation challenges using experimental parameters and nonlinear effects.

Main Results:

  • Detailed overview of signal generation and analysis for key multi-VCS techniques.
  • Strategies for interpreting complex spectral data and mitigating optical interferences.
  • Demonstration of how multi-VCS aids in understanding molecular dynamics.

Conclusions:

  • Multidimensional vibrational coherence spectroscopy is a powerful tool for chemists.
  • The reviewed techniques, when applied correctly, can elucidate vibrational dynamics in excited states.
  • Case studies on carotenoids (non-reactive) and stilbene derivatives (reactive) highlight the technique's versatility.