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

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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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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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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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IR Spectroscopy: Molecular Vibration Overview01:24

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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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Particles in a solid are tightly packed together (fixed shape) and often arranged in a regular pattern; in a liquid, they are close together with no regular arrangement (no fixed shape); in a gas, they are far apart with no regular arrangement (no fixed shape). Particles in a solid vibrate about fixed positions (cannot flow) and do not generally move in relation to one another; in a liquid, they move past each other (can flow) but remain in essentially constant contact; in a gas, they move...
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Updated: Sep 24, 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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Comparative Study of Vibrational Raman Optical Activity with Different Time-Dependent Density Functional

Pierpaolo Morgante1, Herbert D Ludowieg1, Jochen Autschbach1

  • 1Department of Chemistry, University at Buffalo, State University of New York, Buffalo, New York 14260-3000, United States.

The Journal of Physical Chemistry. A
|May 5, 2022
PubMed
Summary
This summary is machine-generated.

A new database, VROA36, aids in evaluating computational methods for vibrational Raman optical activity (VROA) calculations. Four functionals and various basis sets show good agreement with experimental VROA spectra, suggesting reliable theoretical studies.

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Area of Science:

  • Computational Chemistry
  • Spectroscopy
  • Quantum Chemistry

Background:

  • Vibrational Raman Optical Activity (VROA) is a powerful technique for determining molecular structure.
  • Accurate theoretical prediction of VROA spectra is crucial for experimental interpretation.
  • Assessing computational methods for VROA is essential for advancing chemical research.

Purpose of the Study:

  • Introduce the VROA36 database for evaluating computational VROA methods.
  • Compare the performance of four density functionals and various basis sets for VROA calculations.
  • Identify reliable computational strategies for predicting VROA spectra.

Main Methods:

  • Utilized the VROA36 database comprising 36 molecules and 93 conformers with experimental VROA data.
  • Computed VROA spectra using B3LYP-D3(BJ)/def2-TZVP normal modes with four functionals: B3LYP-D3(BJ), ωB97X-D, M11, and optimally tuned LC-PBE.
  • Employed SimROA indices and frequency scaling factors for spectral comparison.

Main Results:

  • All four tested functionals demonstrated comparable performance, independent of the basis set used.
  • Calculated VROA spectra generally showed good agreement with experimental data.
  • Complex (damped) linear response is vital for accurate VROA intensities under near- or at-resonance conditions.

Conclusions:

  • The VROA36 database provides a valuable resource for computational method development.
  • B3LYP-D3(BJ), ωB97X-D, M11, and optimally tuned LC-PBE functionals are suitable for VROA studies.
  • The def2-SVPD basis set or similar is recommended for efficient and reliable theoretical VROA investigations.