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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

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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

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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

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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

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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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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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Interfacial Molecular-level Structures of Polymers and Biomacromolecules Revealed via Sum Frequency Generation Vibrational Spectroscopy
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Semiclassical vibrational spectroscopy with Hessian databases.

Riccardo Conte1, Fabio Gabas1, Giacomo Botti1

  • 1Dipartimento di Chimica, Università degli Studi di Milano, via Golgi 19, 20133 Milano, Italy.

The Journal of Chemical Physics
|July 1, 2019
PubMed
Summary
This summary is machine-generated.

We developed a new method to speed up semiclassical dynamics simulations for vibrational spectroscopy by creating a database of Hessians. This approach reduces computational cost while maintaining accuracy for complex molecular systems.

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Area of Science:

  • Computational Chemistry
  • Theoretical Chemistry
  • Molecular Dynamics

Background:

  • Ab initio "on-the-fly" semiclassical dynamics simulations are computationally intensive.
  • A key bottleneck is the repeated estimation of the Hessian matrix during simulations.

Purpose of the Study:

  • To reduce the computational overhead of semiclassical dynamics simulations.
  • To enable the study of larger and more complex molecular systems.

Main Methods:

  • Developed a novel approach using a dynamical database of Hessians and molecular geometries.
  • Interfaced the method with analytical potential energy surfaces and on-the-fly dynamics.

Main Results:

  • Significantly eased the computational overhead of simulations.
  • Preserved the accuracy of vibrational spectroscopy results.
  • Successfully applied to methane, glycine, and a 46-atom biologically relevant molecule.

Conclusions:

  • The dynamical Hessian database approach offers a practical solution for accelerating semiclassical dynamics simulations.
  • This method expands the scope of achievable studies to larger molecular systems.