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Related Concept Videos

IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

2.3K
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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UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

1.5K
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...
1.5K
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

1.3K
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...
1.3K
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

428
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...
428
UV–Vis Spectroscopy: Woodward–Fieser Rules01:29

UV–Vis Spectroscopy: Woodward–Fieser Rules

24.5K
UV–Visible absorption spectra of conjugated dienes arise from the lowest energy π → π* transitions. The light-absorbing part of the molecule is called the chromophore, and the substituents directly attached to the chromophore are called auxochromes. A strong correlation exists between the absorption maxima, λmax, and the structure of a conjugated π system. The Woodward–Fieser rules predict the value of λmax for a given...
24.5K
UV–Vis Spectroscopy of Conjugated Systems01:32

UV–Vis Spectroscopy of Conjugated Systems

7.0K
Organic compounds with conjugated double bonds show strong absorption features in the UV–visible region of the electromagnetic spectrum attributed to π → π* electronic excitations. Generally, a UV–vis absorption spectrum is recorded as a plot of absorbance vs wavelength. The wavelength of maximum absorbance, which manifests as a peak in the absorption spectrum, is denoted as λmax.
One of the factors influencing λmax is the extent...
7.0K

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Updated: Jul 9, 2025

Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
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Computational Vibrational Spectroscopy.

Markus Meuwly1

  • 1Department of Chemistry, University of Basel, Klingelbergstrasse 80 , CH-4056 Basel, Switzerland,. m.meuwly@unibas.ch.

Chimia
|December 9, 2023
PubMed
Summary
This summary is machine-generated.

Computer methods enhance molecular understanding through vibrational spectroscopy. These techniques link molecular structure to spectroscopic data, aiding gas and condensed phase dynamics studies.

Keywords:
Machine LearningMolecular DynamicsQuantitative SimulationsVibrational Spectroscopy

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Area of Science:

  • * Computational chemistry and molecular dynamics.
  • * Spectroscopic analysis and molecular characterization.

Background:

  • * Vibrational spectroscopy is key for studying molecular dynamics near equilibrium.
  • * Understanding the link between molecular structure and spectroscopic response is crucial.

Purpose of the Study:

  • * To review computer-based methods for analyzing molecular structure and spectroscopic response.
  • * To explore how computational approaches can elucidate structure-spectroscopy relationships.

Main Methods:

  • * Utilizing physics-based and machine-learned energy functions for molecular modeling.
  • * Employing map-based techniques to separate conformational sampling and spectral data determination.

Main Results:

  • * Computer methods provide insights into structure-spectroscopy relationships.
  • * Integrated approaches enhance the analysis of molecular dynamics.

Conclusions:

  • * Computational tools are vital for interpreting vibrational spectroscopy data.
  • * Advanced methods improve the characterization of molecular behavior in different phases.