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Related Concept Videos

IR Spectroscopy: Molecular Vibration Overview01:24

IR Spectroscopy: Molecular Vibration Overview

4.2K
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...
4.2K
Molecular Spectroscopy: Absorption and Emission01:14

Molecular Spectroscopy: Absorption and Emission

4.2K
Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels.  Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.
4.2K
IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration01:16

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

2.5K
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...
2.5K
UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

2.5K
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...
2.5K
Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

4.4K
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...
4.4K
Interaction of EM Radiation with Matter: Spectroscopy01:12

Interaction of EM Radiation with Matter: Spectroscopy

2.9K
Electromagnetic (EM) radiation can be considered an oscillating electric and magnetic field propagating through a medium that can interact with matter in its path. The electric field in the radiation can interact with electrical charges in the atoms or molecules in the matter. On the other hand, the magnetic field can interact with the magnetic field in the atomic nucleus. The study of the interaction between electromagnetic radiation and matter is termed spectroscopy. Spectroscopy is the study...
2.9K

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Updated: Dec 17, 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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Vibrational Spectroscopic Map, Vibrational Spectroscopy, and Intermolecular Interaction.

Carlos R Baiz1, Bartosz Błasiak2, Jens Bredenbeck3

  • 1Department of Chemistry, University of Texas at Austin, Austin, Texas 78712, United States.

Chemical Reviews
|June 30, 2020
PubMed
Summary
This summary is machine-generated.

Vibrational spectroscopy provides crucial insights into molecular dynamics and material properties. A new vibrational frequency map approach, enhanced by machine learning, offers a quantitative method to interpret complex spectroscopic data, advancing chemical and biological studies.

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Area of Science:

  • Vibrational spectroscopy and its applications in chemistry, biology, and materials science.
  • Coherent nonlinear vibrational spectroscopy for studying dynamic molecular processes.

Background:

  • Vibrational spectroscopy is vital for chemical analysis, biological assays, and functional materials.
  • Coherent nonlinear techniques reveal solute-solvent dynamics, molecular conformations, and reaction kinetics.
  • Site-specific vibrational probes enhance time-resolved studies of complex systems.

Purpose of the Study:

  • To review the theoretical foundation and applications of vibrational spectroscopic maps.
  • To address the lack of quantitative interpretation methods for increasing vibrational spectroscopy data.
  • To introduce a new repository for vibrational spectroscopic maps.

Main Methods:

  • Review of semiempirical models, particularly vibrational spectroscopic maps.
  • Application of genetic algorithms, neural networks, and machine learning to vibrational solvatochromism theory.
  • Compilation of experimental observations and their interpretations using vibrational frequency maps.

Main Results:

  • Vibrational spectroscopic maps provide a successful semiempirical approach to interpreting intermolecular interactions.
  • Machine learning enhances the development of vibrational solvatochromism theory.
  • A new online repository (http://frequencymap.org) is available for vibrational spectroscopic maps.

Conclusions:

  • The vibrational frequency map approach, combined with advanced spectroscopy, promises significant future advancements in studying molecular systems.
  • Quantitative interpretation of vibrational spectroscopy data is crucial for broadening its applications.
  • This review highlights the utility of vibrational frequency maps in diverse scientific fields.