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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and the...
Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

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 electronic transitions. As a result...
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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. Samples for...
IR and UV–Vis Spectroscopy of Aldehydes and Ketones01:29

IR and UV–Vis Spectroscopy of Aldehydes and Ketones

Infrared spectroscopy, also known as vibrational spectroscopy, is mainly used to determine the types of bonds and functional groups in molecules. In aldehydes and ketones, the carbonyl (C=O) bond shows an absorption around 1710 cm-1. The C=O bond vibration of an aldehyde occurs at lower frequencies than that of a ketone. In addition to the C=O absorption in an aldehyde, the aldehydic C–H bond also gives two peaks in the 2700–2800 cm-1 range. This absorption, coupled with the C=O stretching, is...
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...

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Ultrafast Time-resolved Near-IR Stimulated Raman Measurements of Functional &#960;-conjugate Systems
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Identification of explosives with two-dimensional ultraviolet resonance Raman spectroscopy.

Gelu Comanescu1, Charles K Manka, Jacob Grun

  • 1Research Support Instruments, Lanham, Maryland 20706, USA.

Applied Spectroscopy
|August 16, 2008
PubMed
Summary

This study presents the first 2D resonance Raman spectra for explosives like TNT and RDX. This advanced technique enhances identification capabilities, even in complex environments.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Materials Science

Background:

  • Resonance Raman spectroscopy is a powerful technique for chemical identification.
  • Existing methods may struggle with complex backgrounds containing interferents.
  • Two-dimensional (2D) spectroscopy offers enhanced data dimensionality.

Purpose of the Study:

  • To measure and analyze the first two-dimensional (2D) resonance Raman spectra of key high explosives: TNT, RDX, HMX, and PETN.
  • To explore the potential of 2D resonance Raman spectroscopy for improved explosive detection.
  • To assess the feasibility of a multi-analyte detection device.

Main Methods:

  • Utilized a novel instrument capable of rapid, sequential switching between 40 laser wavelengths (210-280 nm).
  • Acquired 2D resonance Raman spectra by varying illumination wavelength and observing scatter variations.
  • Applied the technique to common energetic materials including trinitrotoluene (TNT), cyclotrimethylenetrinitramine (RDX), cyclotetramethylenetetranitramine (HMX), and pentaerythritol tetranitrate (PETN).

Main Results:

  • Successfully obtained the first 2D resonance Raman spectra for TNT, RDX, HMX, and PETN.
  • Demonstrated that 2D spectra provide richer data compared to 1D spectra, increasing identification variables.
  • Highlighted the utility of 2D spectra in environments with contaminants and interferents.

Conclusions:

  • 2D resonance Raman spectroscopy significantly enhances the specificity and robustness of explosive identification.
  • The technique's ability to differentiate analytes in complex mixtures is a key advantage.
  • Extending this approach could lead to a single device for detecting explosives, bacteria, and other chemicals simultaneously.