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

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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...
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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.
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Coupled local mode method for simulating vibrational spectroscopy.

Matthew D Hanson1, Steven A Corcelli1

  • 1Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, USA.

The Journal of Chemical Physics
|October 22, 2022
PubMed
Summary
This summary is machine-generated.

We present an accurate and efficient coupled local mode (CLM) method for calculating infrared spectra of protonated water clusters (PWCs). This approach accurately models excess proton behavior in water, crucial for understanding aqueous systems.

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Area of Science:

  • Physical Chemistry
  • Computational Chemistry
  • Spectroscopy

Background:

  • Protonated water clusters (PWCs) are key models for understanding excess proton behavior in aqueous environments.
  • Characterizing spectral signatures is vital for linking experimental data to PWC structures.
  • Accurate vibrational frequency calculations are essential for interpreting PWC spectra.

Purpose of the Study:

  • To extend and validate a coupled local mode (CLM) approach for calculating PWC infrared spectra.
  • To benchmark the CLM method using the H+(H2O)4 cluster.
  • To assess the accuracy of CLM against experimental data.

Main Methods:

  • Implementation and characterization of the coupled local mode (CLM) method.
  • Calculation of infrared spectra for protonated water clusters.
  • Utilizing the H+(H2O)4 cluster as a benchmark system for validation.

Main Results:

  • The CLM method accurately reproduces experimental infrared spectra of PWCs.
  • The CLM approach effectively incorporates OH vibrational anharmonicity and coupling.
  • Calculated spectral features show dependence on electronic structure theory and basis sets.

Conclusions:

  • The extended CLM method provides a computationally efficient and accurate tool for PWC spectral analysis.
  • This method aids in connecting experimental spectra to specific excess proton solvation structures.
  • Understanding the influence of electronic structure methods is crucial for reliable spectral predictions.