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Related Concept Videos

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

IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

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 the...
2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
IR Spectrum Peak Broadening: Hydrogen Bonding01:23

IR Spectrum Peak Broadening: Hydrogen Bonding

The vibrational frequency of a bond is directly proportional to its bond strength. As a result, stronger bonds vibrate at higher frequencies, while weaker bonds vibrate at lower frequencies. The stretching vibration of the strong O–H bond in alcohols and phenols (very dilute solution or gas phase) appears as a sharp peak at 3600–3650 cm−1.
However, the extent of hydrogen bonding influences the observed stretching frequency and band broadening. Intermolecular or intramolecular hydrogen bonding...
UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

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 process,...
High-Resolution Mass Spectrometry (HRMS)01:15

High-Resolution Mass Spectrometry (HRMS)

The resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For example, the mass of helium...
¹H NMR Chemical Shift Equivalence: Homotopic and Heterotopic Protons01:03

¹H NMR Chemical Shift Equivalence: Homotopic and Heterotopic Protons

Protons in identical electronic environments within a molecule are chemically equivalent and have the same chemical shift. The replacement test is a useful tool to identify chemical equivalence and predict NMR spectra. A substituent replaces each of the protons being examined and the resulting molecules are compared. If the same molecule is obtained, the protons are equivalent or homotopic. Replacement of any hydrogens in ethane by chlorine yields chloroethane because all six protons are...

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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
10:40

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

Published on: June 28, 2016

A modified potential for HO2 with spectroscopic accuracy.

João Brandão1, Carolina M A Rio, Jonathan Tennyson

  • 1Departamento Química Bioquímica e Farmácia, FCT, Universidade do Algarve, Campus de Gambelas, 8005-139 Faro, Portugal. jbrandao@ualg.pt

The Journal of Chemical Physics
|April 10, 2009
PubMed
Summary
This summary is machine-generated.

Seven potential energy surfaces for the hydroperoxyl radical were evaluated. Modified potentials accurately reproduce vibrational and rotational data, offering improved accuracy for this radical system.

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Area of Science:

  • Chemical Physics
  • Molecular Spectroscopy
  • Quantum Chemistry

Background:

  • Accurate potential energy surfaces (PES) are crucial for understanding molecular dynamics and spectroscopy.
  • Previous theoretical and experimental studies have provided several PES for the hydroperoxyl radical (HO2), but none are fully satisfactory.

Purpose of the Study:

  • To compare existing ground state potential energy surfaces for the hydroperoxyl radical.
  • To develop improved PES that accurately reproduce experimental spectroscopic data.

Main Methods:

  • Evaluation of seven existing PES derived from ab initio calculations and/or spectroscopic data fitting.
  • Performing vibration-rotation calculations on each PES.
  • Modifying the double many-body expansion IV potential to better fit experimental observations.

Main Results:

  • No single existing PES perfectly matched experimental results.
  • The Morse oscillator rigid bender internal dynamics potential yielded the best spectroscopic results among existing potentials.
  • Modified double many-body expansion potentials accurately reproduce observed vibrational levels and rotational constants.

Conclusions:

  • Existing potential energy surfaces for the hydroperoxyl radical require refinement.
  • The modified double many-body expansion potentials offer a significant improvement for spectroscopic predictions of the HO2 radical.