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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...

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...

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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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.
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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.
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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,...

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Updated: Jun 16, 2026

The Use of High-resolution Infrared Thermography (HRIT) for the Study of Ice Nucleation and Ice Propagation in Plants

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Infrared heterodyne solar radiometry.

|February 2, 2010

Summary

This summary is machine-generated.

High-resolution infrared heterodyne radiometers (IHR) offer sensitive solar spectrometric studies and atmospheric absorption analysis. This technology also aids in evaluating space-to-ground laser communication feasibility.

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The Use of High-resolution Infrared Thermography (HRIT) for the Study of Ice Nucleation and Ice Propagation in Plants

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Area of Science:

Atmospheric science
Spectroscopy
Optical engineering

Background:

High-resolution spectrometric studies are crucial for understanding solar radiation and atmospheric composition.
Atmospheric propagation studies are essential for developing reliable laser communication systems.

Purpose of the Study:

To evaluate the capability of an infrared heterodyne radiometer (IHR) for high-resolution solar spectrometric studies.
To assess the IHR's potential for atmospheric absorption analysis.
To investigate the feasibility of space-to-ground laser communication using IHR for atmospheric propagation studies.

Main Methods:

Utilizing an infrared heterodyne radiometer (IHR) for measurements in the 10-microm region.
Achieving spectral resolutions typically between 6.7 x 10(-3) cm(-1) and 6.7 x 10(-2) cm(-1).
Detecting signals as low as 10(-24) W/Hz.

Main Results:

The IHR demonstrates high sensitivity for solar spectrometric studies.
The instrument is capable of analyzing sunlight absorption in the atmosphere with high resolution.
The IHR can be employed for atmospheric propagation studies at CO(2) laser emission frequencies.

Conclusions:

The infrared heterodyne radiometer is a suitable instrument for high-resolution solar and atmospheric spectrometric investigations.
The IHR's sensitivity and resolution make it valuable for atmospheric absorption studies.
The technology shows promise for assessing space-to-ground laser communication links.