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IR Spectroscopy: Hooke's Law Approximation of Molecular Vibration

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...

IR Spectroscopy: Molecular Vibration Overview

IR Spectroscopy: Molecular Vibration Overview

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...

Infrared (IR) Spectroscopy: Overview

Infrared (IR) Spectroscopy: Overview

When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...

Applications of IR Spectroscopy: Overview

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The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...

UV–Vis Spectroscopy: Molecular Electronic Transitions

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,...

Molecular Spectroscopy: Absorption and Emission

Molecular Spectroscopy: Absorption and Emission

Molecules possess discrete energy levels called quantum states. Unlike atoms, which have simpler energy levels, molecules possess additional rotational and vibrational energy levels. Each energy level is separated by an energy gap, with the gaps between adjacent electronic, vibrational, and rotational levels varying significantly. The three types of energy levels in a diatomic molecule are shown in Figure 1.

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Related Experiment Video

Updated: Jul 11, 2026

Proton Transfer and Protein Conformation Dynamics in Photosensitive Proteins by Time-resolved Step-scan Fourier-transform Infrared Spectroscopy

Proton Transfer and Protein Conformation Dynamics in Photosensitive Proteins by Time-resolved Step-scan Fourier-transform Infrared Spectroscopy

Published on: June 27, 2014

Computing protein infrared spectroscopy with quantum chemistry.

Nicholas A Besley¹

¹School of Chemistry, University of Nottingham, University Park, Nottingham NG7 2RD, UK. nick.besley@nottingham.ac.uk

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences

|September 15, 2007

Summary

This summary is machine-generated.

Quantum chemistry now enables large-scale protein calculations, including infrared amide bands. This advance transforms computational chemistry research and its applications.

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Area of Science:

Computational chemistry
Quantum mechanics
Biophysics

Background:

Quantum chemistry has advanced significantly over the past 50 years.
It has evolved from a niche discipline to a fundamental tool in modern chemical research.
The 1998 Nobel Prize in Chemistry recognized key contributions to the field.

Purpose of the Study:

To describe ongoing work in quantum chemistry.
To focus on the direct quantum chemical calculation of protein infrared amide bands.
To highlight the increasing feasibility of quantitative calculations on large systems like proteins.

Main Methods:

Utilizing quantum chemical methods.
Focusing on the calculation of infrared amide bands.
Applying computational techniques to protein systems.

Main Results:

Quantitative calculations on protein-sized systems are becoming realistic.
Direct calculation of protein infrared amide bands is being developed.
Significant progress is being made towards large-scale quantum chemical modeling.

Conclusions:

Quantum chemistry is entering a new era of capability.
The field is poised to tackle complex biological systems.
Direct quantum chemical analysis of protein properties is a key future direction.