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IR Spectrum

IR Spectrum

When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0%...

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

IR Spectrum Peak Splitting: Symmetric vs Asymmetric Vibrations

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...

IR Spectrometers

IR Spectrometers

There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...

IR Absorption Frequency: Hybridization

IR Absorption Frequency: Hybridization

Hydrocarbons such as alkanes, alkenes, and alkynes show characteristic C–H stretching absorption bands. These IR stretching frequencies depend on the hybridization of the involved carbon atom and can be explained in terms of the s character of each hybridized atomic orbital.
Among the sp, sp2, and sp3 hybridized orbitals, sp orbitals have the maximum s character (50%). Consequently, the electrons are held more closely to the nucleus, resulting in stronger and shorter C–H bonds that...

IR Spectrum Peak Intensity: Dipole Moment

IR Spectrum Peak Intensity: Dipole Moment

The dipole moment of a bond is the product of the partial charge on either atom and the distance between them. Dipole moments influence the efficiency of IR absorption and the peak intensity. When a bond with a dipole moment is placed in an electric field, the direction of the field determines if the bond is compressed or stretched. Electromagnetic radiation consists of an electric field component that rapidly reverses direction. It follows that polar bonds are alternately stretched and...

IR Absorption Frequency: Delocalization

IR Absorption Frequency: Delocalization

Electron delocalization refers to the distribution of electrons across multiple atoms within a molecule rather than being confined to a single atom or bond. This phenomenon is common in systems with conjugated bonds—structures where alternating single and double bonds allow π-electrons to move freely across the network. The movement of electrons stabilizes the molecule and can affect various chemical properties, including vibrational frequencies observed in IR spectroscopy.
In IR...

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Related Experiment Video

Updated: Oct 13, 2025

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

Published on: June 28, 2016

Isolating Polaritonic 2D-IR Transmission Spectra.

Rong Duan¹, Joseph N Mastron^1,2, Yin Song²

¹Department of Chemistry, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109, United States.

The Journal of Physical Chemistry Letters

|November 17, 2021

Summary

This summary is machine-generated.

Researchers developed a method to isolate the true signal of vibrational polaritons by subtracting background noise. This technique enhances the study of polaritonic chemistry and its applications.

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Area of Science:

Quantum optics
Molecular spectroscopy
Physical chemistry

Background:

Strong coupling in optical microcavities creates vibrational polaritons.
Polaritonic chemistry offers applications in reactivity and quantum information.
A key challenge is distinguishing polariton signals from background molecular contributions.

Purpose of the Study:

To develop a method for isolating the true polaritonic response in 2D-IR spectra.
To address the challenge of background signal interference in polariton measurements.

Main Methods:

Analyzing 2D-IR spectra of vibrational polaritons.
Modeling the spectra as a superposition of background and polariton signals.
Implementing a subtraction procedure to remove the background contribution.

Main Results:

Most features in 2D-IR spectra of vibrational polaritons are explained by a linear superposition.
A straightforward correction procedure effectively recovers the polaritonic spectrum.
The filtered bare-molecule 2D-IR spectrum can be subtracted from the cavity response.

Conclusions:

The developed correction method successfully isolates the polaritonic spectrum.
This technique facilitates the study of polaritonic chemistry.
Accurate characterization of vibrational polaritons is crucial for their applications.