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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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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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Atomic Absorption Spectroscopy: Atomization Methods01:25

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Atomic Absorption Spectroscopy (AAS) atomizes samples through flame atomization or electrothermal atomization. Flame atomization typically involves a nebulizer and spray chamber assembly to combine the sample with a fuel–oxidant mixture, creating a fine aerosol mist that enters a burner. Typically, the fuel and oxidant are combined in an approximately stoichiometric ratio. However, for atoms that are easily oxidized, a fuel-rich mixture may be more advantageous. Only about 5% of the...
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A reversible chemical reaction represents a chemical process that proceeds in both forward (left to right) and reverse (right to left) directions. When the rates of the forward and reverse reactions are equal, the concentrations of the reactant and product species remain constant over time and the system is at equilibrium. A special double arrow is used to emphasize the reversible nature of the reaction. The relative concentrations of reactants and products in equilibrium systems vary greatly;...
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IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations01:08

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

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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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Updated: Feb 9, 2026

Analyzing Melts and Fluids from Ab Initio Molecular Dynamics Simulations with the UMD Package
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Dynamic ab initio Methods for Vibrational Spectroscopy.

Sandra Luber1

  • 1Department of Chemistry C University of Zurich Winterthurerstrasse 190, CH-8057 Zurich;,

Chimia
|May 24, 2018
PubMed
Summary
This summary is machine-generated.

This study details advanced computational methods for calculating spectroscopic properties of complex systems. Ab initio molecular dynamics offers superior analysis for condensed phase systems compared to static methods.

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Area of Science:

  • Computational Chemistry
  • Quantum Mechanics
  • Spectroscopy

Background:

  • Development of computational methods rooted in quantum mechanics.
  • Application to diverse systems including biomolecules, coordination compounds, and solar energy processes.

Purpose of the Study:

  • To review recent advancements in accurate spectroscopic property calculations.
  • To highlight forefront methods for vibrational spectroscopy, especially in condensed phase systems.

Main Methods:

  • Utilizing ab initio molecular dynamics.
  • Comparing dynamic approaches with standard static methods.

Main Results:

  • Demonstrated advantages of ab initio molecular dynamics over static approaches.
  • Established the value of this dynamic approach for complex system analysis.

Conclusions:

  • Ab initio molecular dynamics is a powerful tool for in-depth analysis of complex systems.
  • Advancements in computational methods enhance the accuracy of spectroscopic property calculations.