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Related Concept Videos

IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

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 C=O, C=N, and C=C occur between 1600–1850 cm−1.
The...
IR Spectrometers01:25

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...
Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
Interference and Diffraction02:18

Interference and Diffraction

Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
IR Spectrum01:19

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% (complete...
Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...

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Terahertz Imaging and Characterization Protocol for Freshly Excised Breast Cancer Tumors
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Published on: April 5, 2020

Fingerprint extraction from interference destruction terahertz spectrum.

Wei Xiong1, Jingling Shen

  • 1Beijing Key Lab for Terahertz Spectroscopy and Imaging, Capital Normal University, No 105 XiSanHuan BeiLu, Beijing 100048, China.

Optics Express
|October 14, 2010
PubMed
Summary

Interference effects cause periodic peaks in terahertz absorption spectra. A new technique eliminates these peaks, enabling accurate terahertz fingerprint extraction for material identification.

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Area of Science:

  • Spectroscopy
  • Materials Science
  • Optics

Background:

  • Terahertz (THz) absorption spectra are crucial for material identification.
  • Interference effects can distort THz spectra, complicating analysis.
  • Extracting accurate spectral fingerprints is essential for reliable material characterization.

Purpose of the Study:

  • To identify the cause of periodic peaks in THz absorption spectra.
  • To develop a method for eliminating interference effects in THz spectra.
  • To demonstrate the extraction of authentic THz fingerprint spectra for material analysis.

Main Methods:

  • Theoretical explanation and calculation of interference-induced periodic peaks.
  • Development of a novel technique to suppress spectral interference.
  • Experimental validation using Methamphetamine as a test sample.

Main Results:

  • Periodic peaks in THz spectra are confirmed to originate from interference.
  • A technique effectively eliminates interference peaks, yielding a clear absorption spectrum.
  • The terahertz fingerprint of Methamphetamine was successfully extracted from a distorted spectrum.

Conclusions:

  • Interference effects are a significant factor in THz spectral analysis.
  • The developed technique enables the acquisition of genuine terahertz absorption spectra.
  • This method offers a fast, non-destructive approach for material identification using THz spectroscopy.