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Related Concept Videos

Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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,...
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.
Tandem Mass Spectrometry01:21

Tandem Mass Spectrometry

Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and reduce chemical noise during analyte detection. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.Secondary fragmentations occur in the interaction cell and can be induced by various factors. Fragmentation induced by collision with inert gases, such as N2, Ar, He, etc., is called...
Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...
Atomic Spectroscopy: Absorption, Emission, and Fluorescence01:23

Atomic Spectroscopy: Absorption, Emission, and Fluorescence

Atomic spectroscopy is a vital tool in elemental analysis, both qualitatively and quantitatively. It can be broadly divided into optical spectroscopy, mass spectroscopy, and X-ray spectroscopy methods. The optical spectroscopic methods are atomic absorption spectroscopy (AAS), atomic emission spectroscopy (AES), and atomic fluorescence spectroscopy (AFS). The first step in all three methods is atomization, where the solid, liquid, or solution-phase samples are converted into gas-phase atoms and...

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Updated: May 30, 2026

Quantitative Detection of Trace Explosive Vapors by Programmed Temperature Desorption Gas Chromatography-Electron Capture Detector
07:57

Quantitative Detection of Trace Explosive Vapors by Programmed Temperature Desorption Gas Chromatography-Electron Capture Detector

Published on: July 25, 2014

[Aging explosive detection using terahertz time-domain spectroscopy].

Kun Meng1, Ze-ren Li, Qiao Liu

  • 1Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China. mengkunsdu@yahoo.com.cn

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|August 2, 2011
PubMed
Summary
This summary is machine-generated.

Detecting aged explosives is crucial for safety. This study introduces a new method using terahertz time-domain spectroscopy (THz-TDS) to identify molecular changes in aging explosives, improving detection accuracy.

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Area of Science:

  • Materials Science
  • Spectroscopy
  • Computational Chemistry

Context:

  • Assessing the aging of explosives is critical for ensuring their safety and stability.
  • Current detection methods like microscopy and spectroscopy struggle to differentiate aged explosives or visualize molecular changes.
  • Existing techniques lack the specificity to identify aging in explosive materials.

Purpose:

  • To investigate the potential of terahertz time-domain spectroscopy (THz-TDS) for detecting aged explosives.
  • To analyze spectral differences between pristine and aged explosive molecules in the terahertz band using density functional theory (DFT).
  • To demonstrate the feasibility, accuracy, and practicality of THz-TDS for aging explosive detection.

Summary:

  • This research utilizes density functional theory (DFT) to calculate the absorption spectra of pristine and aged explosive molecules.
  • Significant spectral differences were identified in the terahertz band, enabling differentiation between aged and unaged explosives.
  • The study analyzes the capabilities of the terahertz time-domain spectroscopy (THz-TDS) system and validates its application for detecting aging explosives.

Impact:

  • Proposes a novel and practical method for detecting aging explosives using THz-TDS.
  • Enhances the capability to assess the security and stability of explosive materials.
  • Provides a foundation for developing advanced, non-destructive techniques for explosive material characterization.