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Related Concept Videos

IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
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Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

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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.
The ATR process begins by directing a beam...
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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.
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%...
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IR Spectrometers01:25

IR Spectrometers

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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...
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UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
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Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

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Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material,  molecules absorb light depending on the energy required for...
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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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[A Terahertz Spectral Database Based on Browser/Server Technique].

Zhuo-yong Zhang, Yue Song

    Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
    |December 17, 2015
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    Summary
    This summary is machine-generated.

    A new browser/server terahertz spectral database was developed, offering fast spectral matching and optical parameter calculations. This resource aims to advance terahertz technology applications through accessible spectral data.

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    Area of Science:

    • Spectroscopy
    • Materials Science
    • Instrumentation

    Context:

    • Terahertz (THz) technology is gaining attention for its unique advantages in fast, non-damaging detection.
    • Integrating THz technology with other methods addresses complex practical challenges.
    • A reliable THz spectral database is crucial for advancing practical THz detection methods.

    Purpose:

    • To introduce a newly developed browser/server-based terahertz spectral database.
    • To detail the database's structure, functions, and data sources.
    • To highlight features like optical parameter calculation and spectral matching.

    Summary:

    • Developed a browser/server (BS)-based terahertz spectral database containing over 240 items from diverse sources.
    • Implemented key functions including optical parameter calculation (absorption coefficient, refractive index) from THz time-domain spectra.
    • Integrated user registration, spectral matching, and online searching for convenient access and analysis.

    Impact:

    • Provides a powerful, convenient, and efficient tool for researchers and practitioners.
    • Facilitates the broader application of terahertz technology in various scientific and industrial fields.
    • Enables rapid identification and analysis of materials using spectral data.