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Related Concept Videos

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...
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...
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: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
The atomizer used in AAS can be either a flame atomizer or an...
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...
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.

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Updated: Jun 28, 2026

A Multimodal Wide-Field Fourier-Transform Raman Microscope
06:48

A Multimodal Wide-Field Fourier-Transform Raman Microscope

Published on: December 30, 2025

A compact collinear AOTF Raman spectrometer.

N Gupta1, N F Fell

  • 1Sensors and Electron Devices Directorate, Army Research Laboratory, 2800 Powder Mill Road, Adelphi, MD 20783-1197, USA.

Talanta
|October 31, 2008
PubMed
Summary
This summary is machine-generated.

A new acousto-optic tunable-filter (AOTF) spectrometer measures Raman spectra of energetic materials. This compact, automated instrument shows impressive performance for field and remote sensing applications.

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Materials Science

Background:

  • Raman spectroscopy is crucial for analyzing energetic materials.
  • Existing spectrometers can be bulky and unsuitable for field measurements.
  • Acousto-optic tunable-filter (AOTF) technology offers potential for compact spectrometer design.

Purpose of the Study:

  • To evaluate a compact, automated AOTF spectrometer for measuring Raman spectra.
  • To assess the instrument's performance with organic energetic materials.
  • To compare AOTF-based Raman spectra with FT-IR spectra.

Main Methods:

  • Utilized a collinear, uncooled, fully-automated AOTF spectrometer.
  • Employed argon-ion laser excitation for Raman spectra acquisition.
  • Measured spectra of NQ, HMX, and TNT energetic materials.
  • Compared obtained Raman spectra with FT-IR data.

Main Results:

  • The AOTF spectrometer, despite modest resolution (7.4 cm(-1)), yielded impressive Raman spectra.
  • Successfully measured spectra for NQ, HMX, and TNT.
  • Demonstrated the instrument's utility for analyzing energetic materials.

Conclusions:

  • The developed AOTF spectrometer is a viable tool for Raman spectral analysis of energetic materials.
  • Its compact and automated nature makes it suitable for remote sensing and field applications.
  • Further comparison with FT-IR spectra validates the AOTF spectrometer's capabilities.