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Related Concept Videos

Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

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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.
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Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

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A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
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IR Spectrum Peak Intensity: Dipole Moment01:20

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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...
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IR Spectrum01:19

IR Spectrum

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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 Spectrum Peak Intensity: Amount of IR-Active Bonds00:55

IR Spectrum Peak Intensity: Amount of IR-Active Bonds

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When infrared radiation is passed through a molecule, absorption occurs if the molecule's vibration leads to a substantial change in its bond dipole moment. Transitions between vibrational energy levels, typically corresponding to infrared frequencies (4000–400 cm−1), allow absorption if the vibration significantly alters the dipole moment, making the molecule infrared active. The molecular bonds have different stretching and bending vibrations, resulting in various peaks with...
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IR Frequency Region: X–H Stretching01:24

IR Frequency Region: X–H Stretching

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In IR spectroscopy, signals produced by the X−H bonds (such as C−H, O−H, or N−H) can be observed in the frequency range of  2700–4000 cm–1. The C−H stretching vibration forms sharp bands in the region 2850–3000 cm–1. The presence of the O−H stretching vibration leads to the forming of an absorption band in the frequency range 3650–3200 cm−1. At the same time, N−H stretching can be confirmed by absorption bands in...
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Polarization characteristics of objects in long-wave infrared range.

Fei Liu, Xiaopeng Shao, Ying Gao

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    |February 3, 2016
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    Summary

    A new model analyzes thermal emission polarization for finite objects, enhancing target detection. It details how detection distance and object shape influence polarization in the long-wave infrared spectrum.

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    Area of Science:

    • Optics and Photonics
    • Remote Sensing
    • Materials Science

    Background:

    • Polarization characteristics are crucial for target detection and material identification.
    • Existing theoretical descriptions of polarization vary in accuracy and completeness.
    • Incomplete models hinder understanding of macroscopic influences on polarization.

    Purpose of the Study:

    • To develop a comprehensive model for analyzing polarization characteristics of thermal emission from finite objects.
    • To investigate the relationship between the degree of linear polarization and spatial-geometric parameters.
    • To explore applications in material identification using polarization.

    Main Methods:

    • Utilized Stokes theory and the superposition principle of light waves.
    • Developed a model for finite object thermal emission polarization.
    • Analyzed polarization in the long-wave infrared (LWIR) range.

    Main Results:

    • Established a detailed relationship between the degree of linear polarization and parameters like detection distance and object shape.
    • Demonstrated the model's applicability to analyze linear polarization characteristics across different materials.
    • Provided a more complete theoretical framework for polarization analysis.

    Conclusions:

    • The developed model offers a comprehensive approach to understanding thermal emission polarization.
    • Spatial-geometric parameters significantly influence polarization characteristics.
    • This research advances polarization-based target detection and material identification capabilities.